Lml duramax crank no start

Have a 2016 LML will not start. Drove fine and shut it off and now will not crank. Just hear a click. Some background: Truck is stock with 140000kms. Had a slow crank/start issue for the last little while which I knew was a bad battery. Tired to boost it and still wont crank. Replaced both batteries and checked relays. No change.

LML crank No Start After Rebuild. 2016 LML duramax, cp3 swapped (before rebuild all tuning is for cp3 swap), fass 165, installed Mahle performance pistons and rings, I’ve bled all the air you can possibly think. Maybe there’s more left. I’m between 430-450psi in all cylinders as well, did a manual compression test after completing the ...Truck: 2011 lml duramax, fully deleted (block off plates), running efi live stage 1, Cat filter adapter, S&B intake. Problem: When the weather starts to turn cold and I’m only talking about 30 degrees Fahrenheit (so not that cold) my truck will either take multiple cranks to start or won’t start at all. While cranking i have white smoke ...Make your home or office a pleasure to print from with one of the best-reviewed printer brands. From laser printers that crank out 25 pages per minute to economical home printers a...When I release the key everything comes back. I get service 4x4, service stabilitrak, service traction control. No illuminated DTCs. But when I use the autocal it pulls up a few codes. Which I will attach in a picture. I pulled every fuse (there were a few blown) but this didn’t help. Does anyone have an idea where to start?LML engine knock Thread starter ikeG; Start date Mar 23 , 2020 ... I can spin the crank over faster, which makes a whirring or clicking sound. I think I might have narrowed it down to the oil pump. Removed water pump first, no change. ... Duramaxdiesels.com was founded in 2006 and created a site which houses some of the best known Duramax tech ...

The fuel return lines require 80+ psi to help close the injectors. Was able to pull the line off the barbed fitting on the back drivers side put 80 psi of compressed air through the system and get it to run. S475 Over 3794 Billet, 10mm Stroker CP3, 60% overs and built trans. Not bad for a tow rig.8350 posts · Joined 2010. #9 · Nov 19, 2012. Unplug the FPR wires and try to start it. It will make the CP3 work at 100%, and create 100% rail pressure. It will lope hard if it starts, But it's an idea. Or you can try to pressurize the tank with about 10psi and try starting the truck. It may help the CP3 prime itself.1. Start Relay Pin 86 -- Page B-6 (Should be +12 VDC) Post what voltage you have. If no +12 VDC there, check at UBEC Fuse # 13 ECM-BATT (2 Amp) for +12 VDC on both sides of Fuse. This Fuse Powers the Ignition Switch. Post what Voltage you find at this fuse. The Ignition Switch makes BCM_RC (HOT) +12 VDC which picks Relay RUN/CRANK by makingBoth brake lights dont work when the pedal was pushed. Service trailer brake system, stabilitrak, and parking assist messages come up. The truck ran fine last week after I changed out the tensioner. There was no problem. I had changed out the idlers and belt a month before with no problems after. So far I've checked the batteries with a 100 amp ...Reduced engine power - No Codes. Last week my wife's LML (disabled EGR, exhaust, Tuned, airdog 4g lift pump) went into reduced power mode. She was below 1/8th tank. she turned the truck off and started back up. no more reduced power. she drove it to a gas station and filled up. I chalked it up to maybe a fuel pickup issue and I should install a ...

Crank no start but will…. 2015 Chevy 2500 with 6.6 duramax. Crank no start but will start on ether and run fine. Hand pump will build pressure but it bleeds off pretty quick. Ran a hose from external tank directly to injection pump and still wouldn’t build enough pressure to start. The injection pump has been replaced.LML Check Engine Light. Remote started the truck a few days ago (was in the 20's that night) went out to get in my what was supposed to be warm truck to find it never started. Pulled these codes with my edge evolution. P24C4 and P2493. Cleared them and they didn't come back until today.D. DuramaxNoKaOi Discussion starter. 392 posts · Joined 2008. #7 · Feb 10, 2014. Hey John, FYI I found out the injectors NEED minimum 1500 PSI of rail pressure to open, at least the LML with piezo injectors do, and I'd bet the older ones do too. I've got plenty of tips and suggestions for making it as easy as possible.The LML was the biggest overhaul Duramax had done to the 6.6L diesel, using 60% new parts. It received major changes to the block, rod, pistons, emissions equipment and fueling system.. The big engine changes to the block and internal components led to a stronger and more durable engine, but the new fueling system and emissions equipment plagued the LML with problems.Then you will bump the starter motor over leaving it in on position (even if it cranks itself for a while). Then the fuel pump once again should be buzzing for a few seconds, (it does this as the computer sees RPM and turns on the fuel pump (as commanded) whenever there is RPM). it is right on top of the fuel filter.

Nancy spungen crime scene photos.

4. Location. Houston, Texas. Mar 5, 2010. #1. Tried to crank the truck today and the the glow plug light never came on. It turns over but won't start. It's been starting fine the past few days, but the glow plug light would only come on for a few seconds. I checked the fuse and it's not popped, but there is no power coming to it when I checked ...In the wake of yesterday’s landmark ruling by Europe’s top court — striking down a flagship transatlantic data transfer framework called Privacy Shield, and cranking up the legal u...687 posts · Joined 2016. #2 · Oct 5, 2018. After it has been run (warmed up), push the primer button until its firm, then see if it starts right up without excessive cranking. If it does start right up, its loosing prime. However, if it starts fine when cold, then prime would not be an issue. 2003 2500HD 6.6 duramax (LB7) all stock (no mods ...2011 duramax lml no crank no start. Jump to Latest Follow 302 views 2 replies 3 participants last post by Ron Nielson Nov 6, 2023. R. Romanov Discussion starter 3 posts · Joined 2023 Add to quote; Only show this user #1 · Nov 5, 2023. Bought truck about 2 months ago, it was blown, needed new rods and bearings. crank as well. ...

The CAM signal present and the engine RPM parameters on the scan tool should change. If the CAM signal present and the engine RPM does not change, replace the ECM. Ignition OFF, inspect the wiring harness for any damage, opens or shorts. If the circuits test normal, replace the CMP sensor. Repair Instructions.11-16 LML Duramax Powertrain FIXED!! No dash lights no crank 2015 LML ... I turned my truck around in the driveway and next day I have no dash lights, no crank (just a click), no obd II to read codes, and head lights and running lights are funky. ... then the other. Truck should start with just one battery if it isn't to cold. Check the output ...Remove the hypertech and try starting. Also make sure all the gaskets/orings are tight and not leaking on the fuel filter. Once confirmed, crack the bleeder valve and hand prime until fuel squirts out. Once fuel is present then re tighten valve and start truck. 2012 F150 Lariat w/Ecoboost.LMM no start/no crank. Truck is a 2008 LMM, EFI live/5 switch, full exhaust, and an intake. Approx. 95,000 miles. No prior issues. Drove it to work a week ago and parked it. Came back after 8 hour shift and turned the key. Lights on dash illuminated but truck did not turn over or make any noise.Ecm isn't sending fuel signal or anything the the bcm got out the test light and power probe and got power everywhere to the ecm except the 12v turn on signal from the bcm had a buddy come and try to read the canbus system and it wouldn't connect to it eventually after disconnecting the batteries for about a day it was able to start up but ...Bad starter. Load tested batteries, they are fine. Came home and hooked them back up, had 12v at the starter power lead. Had my dad crank the key while I had …Everything is bigger in Texas, which is why we’re bringing the TechCrunch Meetup + Pitch-off to the state’s capitol, Austin. After all, it’s a big deal. We’ll have beer, excellent ...136k Miles, and yes cranks like normal. Chevy Mechanic: Vince S. If you were to pinch off the hose from the filter assembly to the injector pump will it hold pressure. If it holds i woukd then loosen the steel line from the pump to the fuel rail and see does any metal come out of it.Advertisement Dueling is very much entwined with honor. However, the concept of honor in centuries past is very different from what most people think of as honor today. For one thi...darmah59. 389 posts · Joined 2008. #12 · Feb 18, 2021. Texas diesel has not been treated for the cold weather, who would have guessed such temps in TX. Unfortunately the fuel that is causing the issue is in the lines, pump, filter etc and needs to cycled, but because it is jelled it cannot be pumped.Remove the hypertech and try starting. Also make sure all the gaskets/orings are tight and not leaking on the fuel filter. Once confirmed, crack the bleeder valve and hand prime until fuel squirts out. Once fuel is present then re tighten valve and start truck. 2012 F150 Lariat w/Ecoboost.

Chevy / GMC Duramax 04.5-05 LLY Forum. 04.5-05 LLY Duramax Powertrain The infamous U0101 Code. Jump to Latest ... A few hours later go back, I have (ABS, Break & Security light) poppin up. No Crank - No Start. Tried the wire from the TCM to the neg. terminal. nothing. I believe it's fried. nothing unplugged up loose really. I need to get it fix ...

11-16 LML Duramax Powertrain. Follow Forum Create Thread Filters ... 2016 Duramax won't start after fuel filter change. Polymather; Apr 18, 2024; 18 ... FIXED!! No dash lights no crank 2015 LML. NBE1; Dec 22, 2021; 19 11K Apr 14, 2024 ...LML crank No Start After Rebuild. 2016 LML duramax, cp3 swapped (before rebuild all tuning is for cp3 swap), fass 165, installed Mahle performance pistons and rings, I’ve bled all the air you can possibly think. Maybe there’s more left. I’m between 430-450psi in all cylinders as well, did a manual compression test after completing the ...About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ...About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ...2013 duramax lmlCrank no start Code p128e reduced power and fuel filter changeReplaced fuel filter And new exergy fpr on cp4 No metal shavings found Truck started ran for a couple miles and shutoffEnded up doing the cp3 50state conversion Got the truck to start ran fine started couple times Let it sit couple hours laters crank no startRemoved return line from check valve added shop air cranked ...Won't start. Took the factory fuel filter off (was band new 2500 miles ago last week) and it didn't appear to be gelled. (I've never seen what gelled diesel looks like but it acted like normal fuel and poured out) warmed up the factory filter inside, put a little 911 in it, installed it, let the lift pump run while cracking the filter so fuel ...2013 duramax lmlCrank no start Code p128e reduced power and fuel filter changeReplaced fuel filter And new exergy fpr on cp4 No metal shavings found Truck started ran for a couple miles and shutoffEnded up doing the cp3 50state conversion Got the truck to start ran fine started couple times Let it sit couple hours laters crank no startRemoved return line from check valve added shop air cranked ...Jul 11, 2018 · Step 1 – Attempt to start the vehicle. It will crank, but not run. The security light will be flashing on and off. Leave the key in the ‘run’ position for exactly 10 minutes, then the security light will stay solid or go off. Step 2 – Turn the key to the ‘off’ position for 10 seconds. Attempt to start the vehicle.

Iltexas east fort worth.

Del taco raleigh nc.

The CAM signal present and the engine RPM parameters on the scan tool should change. If the CAM signal present and the engine RPM does not change, replace the ECM. Ignition OFF, inspect the wiring harness for any damage, opens or shorts. If the circuits test normal, replace the CMP sensor. Repair Instructions.Chevy / GMC Duramax 04.5-05 LLY Forum. 04.5-05 LLY Duramax Powertrain No Crank, No Start, No Jump ... Just like the title says, my LLY won't crank, won't start and can't get it to jump. A little background first though: last week Wednesday I got ready for work and went to start it, not to cold (~25 degrees) and it wouldn't start so I plugged it ...4. Location. Houston, Texas. Mar 5, 2010. #1. Tried to crank the truck today and the the glow plug light never came on. It turns over but won't start. It's been starting fine the past few days, but the glow plug light would only come on for a few seconds. I checked the fuse and it's not popped, but there is no power coming to it when I checked ...Ran the tank down and refilled with fresh fuel and haavent had any problems since. 2006 CCLB LLY . 5" Flo-Pro exhaust with 6" tip, s&b intake, EFI live, Transgojr, Allison deep pan, Nicktane cat adapter, 17" wheels with 285's, nerfbars, ventvisors, fronts tinted to match rears with shadeband, and remote start.I had to reprime after letting the truck sit for more than a couple of hours. Present: 2015 K2500HD LTZ Crew Cab Z-71. My Chevy Truck History: 2011 K2500HD LTZ Crew Cab LML. 2007 Classic K2500HD LT3 Crew Cab LBZ. 2006 K2500HD LT3 Extended Cab LBZ. 2003 K1500 LTZ X-Cab Z-71 5.3 Liter Gas. 1998 K1500 Silverado Z-71 5.7 …No communication with TCM. No communication with Glow Plug Control Module. P0113. P0090. P0098. Pulled every connector apart and put them in plastic bags with silica packets for 48 hours. Used WD40 and wire dryer on connections. Went to start truck and voltages were all over the place. Lights dimming and brightening repeatedly.Jun 8, 2020. #1. Looking for some input. I'm troubleshooting my 2015 lml, died on the side of the road low rail pressure P128e and the change fuel filter message. The system was loaded up with air so I made up an auxiliary tank to the inlet of the filter housing, primer pumps hard after 4-5 pushes. I wanted to bleed at the supply lines from ...If you’ve ever experienced the frustration of turning the key in your car’s ignition only to hear the engine crank but not start, you’re not alone. This common issue can leave car ... ….

The CAM signal present and the engine RPM parameters on the scan tool should change. If the CAM signal present and the engine RPM does not change, replace the ECM. Ignition OFF, inspect the wiring harness for any damage, opens or shorts. If the circuits test normal, replace the CMP sensor. Repair Instructions.Truck: 2011 lml duramax, fully deleted (block off plates), running efi live stage 1, Cat filter adapter, S&B intake. Problem: When the weather starts to turn cold and I'm only talking about 30 degrees Fahrenheit (so not that cold) my truck will either take multiple cranks to start or won't start at all. While cranking i have white smoke ...When cranking, the FICM has full control of the fuel injectors. The only input the FICM uses at this time is the engine speed signal from the ECM. The FICM monitors the signal along with the injection request signals from the ECM after the engine is running. If there is a problem with this signal, a DTC could set.OkDually. 24260 posts · Joined 2013. #2 · Jan 6, 2023. Welcome. First, check for any trouble codes and post the exact codes here if any are found. Try installing the original FPR back in. Inspect the fuel lines to/from the CP4 and make sure they are not dry rotted/cracked or kinked in any way. Inspect all fuses.LML engine knock Thread starter ikeG; Start date Mar 23 , 2020 ... I can spin the crank over faster, which makes a whirring or clicking sound. I think I might have narrowed it down to the oil pump. Removed water pump first, no change. ... Duramaxdiesels.com was founded in 2006 and created a site which houses some of the best known Duramax tech ...Oct 7, 2018 · Connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85. Turn the ignition to the start position. The test lamp should turn ON when the ignition is in the START position, and OFF in all other positions. ¤ If the test lamp is always on, test the control circuit for short to voltage. Chevy / GMC Duramax 06-07 LBZ & LLY Forums. 06-07 LBZ & LLY Duramax Powertrain. no crank, no start. Jump to Latest Follow 914 views 3 ... 2015 Chevy Silverado 2500 HD 6.6L LML.Feb 23, 2020 · 1 post · Joined 2020. #1 · Feb 23, 2020. I have a 2012 Chevrolet Silverado LML 6.6 3500hd. Recently had to do a motor swap due to a broken crank shaft. I Swapped the motor now I’m having a No Crank / No start Issue. Thought maybe bad wiring harness so I swapped harnesses, Wasn’t the issue, Doing that same thing. The starter does work! If rail pressure matches desired, diagnose other codes that may be related to starting problems. Unplug the fuel pressure regulator 2 (pressure control valve in left hand rail) electrical connector. Crank the engine for 15 seconds and verify there is a steady flow of fuel from the fitting on the rail.Service Bulletin Bulletin No.: 16-NA-102 Date: August, 2019 TECHNICAL Subject: Duramax Diesel Hard Start, No Start, DTCs P0087, P0088, P0191, P128E or Injection Pump Replacement Brand: Model: Model Year: VIN: Engine: Transmission: from to from to Chevrolet Express 2010 2016 Diesel (RPOs LML or LGH) Silverado 2500/3500 GMC Savana Sierra 2500/3500 Lml duramax crank no start, 1) (No Start) Disconnect the electrical connector and return line from one injector. Plug the fuel return line fitting with a suitable tool (CH-50377-A). Crank the engine for 15 seconds and verify no fuel leaks from the injector. If fuel leaks from the injector, replace it. Repeat for all eight injectors., 3547 posts · Joined 2007. #5 · Jun 9, 2009. X3 on the sensor, mine did not even leak a drop of fuel but took longer to start. 2006 2500HD CCSB 4X4 RED LBZ. Spray-In Bed Liner, Air Bags. Custom Reese 20K slider FWH/Gooseneck hitch. 265/75/16 Michelin LTX AT2's on PYO's. Duramax.com tow tune w/turbo brake., 2011 Sierra 2500HD CCSB LML (Buisness vehicle) - 4" Fabtec w/ DirtLogics, ... It would crank and crank but no start. It ended up being a relay relating to the fuel system but I dont remember which one. ... 2011 3500HD CCLB SRW LT Duramax Silver Ice Metallic 2012 2500HD CCLB LTZ Duramax, Silver Ice Metallic Efi Live from PPEI, 5 inch AFE ..., This duramax was brought in for a cranks no start condition. It's not making any high pressure fuel pressure. Starts and runs with propane. I believe its got..., 1445 posts · Joined 2009. #19 · Dec 8, 2013. Try one battery at a time. While it might crank slow on a single battery, one might show itself to be bad by cranking really slow or not at all. 2005 Chevy Silverado 3500LT SRW D/A CC/LB LLY 4x4 (loaded) LBZ MP, TxCAI, Stack sealing, Mass/IAT shield, LML manifold., About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ..., LML crank No Start After Rebuild. 2016 LML duramax, cp3 swapped (before rebuild all tuning is for cp3 swap), fass 165, installed Mahle performance pistons and rings, I’ve bled all the air you can possibly think. Maybe there’s more left. I’m between 430-450psi in all cylinders as well, did a manual compression test after completing the ..., also, try and stay away from either. if you get desperate, use a small amount of gasoline, WD40 or something similar. much safer. bad CP3 can definitely leak fuel in to the return. pull the return on the CP3 and verify how much comes out when cranking. if it is too much it can rob the pumps ability to make pressure. M., 3 posts · Joined 2017. #1 · Mar 22, 2017. My 2012 lml shut off of me while driving home. No codes or lights, just shut down. Once off the road it would not restart. Engine cranks fine but will not start. No codes are being thrown. Current mods are fass150..s&b intake...4 inch flo pro...efi live by KW. I have disconnected the fass system at ..., 2015 lml crank no start low fuel pressure. Looking for some input. I'm troubleshooting my 2015 lml, died on the side of the road low rail pressure P128e and the change fuel filter message. The system was loaded up with air so I made up an auxiliary tank to the inlet of the filter housing, primer pumps hard after 4-5 pushes., 8350 posts · Joined 2010. #7 · Nov 2, 2014. Using a test light, check the small wire on the starter for power when the key is turned to start. If it has signal from the key every time then the problem is the starter. If its not getting power when triggered it is before the starter and needs to be traced back. -Aaron- ., Pinching the return line isn't always enough. The injectors need a good bit of pressure to fire. If you apply a little bit of air pressure to the return line, and crank it, that will be your best chance of getting it to fire up quicker. Don't go crazy with the air though, 60-80 psi is about what I'd try to start off., long crank I have a 2003 LB7 with 75000mi. When it starts{sometimes it does not} it takes 5 or 6 seconds to start hot or cold. It runs great,no smoke,no fuel in oil.I have had the fuel filter housing rebuilt,a FASS fuel pump system installed,fuel pressure regulator and a glow plug module., 64 posts · Joined 2012. #1 · Nov 1, 2019. Heading down the highway and heard an engine rattle noise like a sputter dying sound. Pulled over, engine died and will not start. No trouble lights or codes come up on the scanner. Pumped up the fuel filter multi times and tried to start but no luck. 2014 dually, deleted 2 years ago without a problem ..., 2011 LML Won't start. Best wishes for all! Kindly ask about some expert opinion. Have LML after CP4 died (metal shelves were found on pressure regulator filter). Changed CP4 to new CP4 (no more changed, cleaned everything, each injector was disassembled and very carefully cleaned) started engine from xxx times and found that my pressure ..., During cranking fuel rail pressure builds up quick, well past 50 Mpa, and follows right along with the desired rail pressure. Despite rail pressure building up the …, The Mini Maxx is picking up three codes... P2510 "Power relay Sense Circ Range/Performance" P0513 "Incorrect Immobilizer Key" and P0571 "cruise control break switch circuit". I keep clearing the codes and sometimes only one or two of these will pop back up and sometimes all three will come back up. This all started happing after I got the truck ..., LML wont start after D. 2015 LML and did a D for the dpf and egr. Downloaded the tune from a reputable tuner and cannot get truck running. It ran 1 time for 5 seconds then died. It just cranks and other times it clicks like a dead battery but both batteries are at 80%. I am stuck here no idea why it won't start or even crank sometimes., The announcement comes after the company's vice-president met with high-powered Israel officials. When Airbnb last month (Nov. 20) announced plans to suspend almost 200 listings in..., I know a no start on the LML's isn't a new thing I've seen it a couple times and fixed a couple but this one is making zero sense. So here is the problem: random no crank no start, cluster will light up and all accessories will power up communication with ecm, tcm, bcm and security module are all good via a scan tool. zero codes. truck will go ..., Hooked up bluetooth scanner and read codes P128E & P0088 (high fuel rail pressure) reset the codes and took it for a ride. Seemed fine, but when I stood on the gas it wouldn't go over about 2900 RPM then check engine light with reduced power mode, and change fuel filter message. Swapped out the filter and took it for a ride with scantool hooked ..., Chevy / GMC Duramax 11-16 LML Forums. 11-16 LML Performance Parts Discussion ... Ive had no luck in sourcing this problem however now my problem has escalated to the engine now will not even crank over. I have a series of alarms evident and I will run through what ive done to try to find the falult to eliminate suggestions you might have and ..., Chevy / GMC Duramax 11-16 LML Forums. 11-16 LML Performance Parts Discussion crank no start duramax ... ihave a 2015 duramax crank no start problem changed fuel filter head and filter and no difrence i can start with starting fluid and runs good stalls a little at full throttle added a electric fuel pump still dont start also i haded …, If DTC P2610 is set, turn the ignition OFF and then completely disconnect the ECM harness connector from the ECM for approximately 1 minute. Reinstall all of the ECM connectors and then attempt to clear codes with the scan tool. If DTC P2610 resets after code clear, replace the ECM. Ron Nielson. 2008 2500HD LT CCLB/Ally., 2011 2500HD Silverado LTZ 6.6L Duramax LML No Mods. Save Share. Like. ... I've had 2 random long crank no start situations in 5 years after driving to the store like you did. Solved the first time giving it a couple of plunger pumps so that is what I did the 2nd time. No clue why it loses prime randomly like that and won't do it again for a ..., 3 posts · Joined 2017. #1 · Mar 22, 2017. My 2012 lml shut off of me while driving home. No codes or lights, just shut down. Once off the road it would not restart. Engine cranks fine but will not start. No codes are being thrown. Current mods are fass150..s&b intake...4 inch flo pro...efi live by KW. I have disconnected the fass system at ..., Aug 8, 2016 · Aug 9, 2016. #6. here is a list of the current codes in the truck, ECM U0101 lost communication with transmission. TCM will not communicate. BCM B1440 power mode master input circuits. U1000 loss of serial communication for. cluster U1000 loss of serial communication for. HVAC B3770 airflow control 6 feedback circuit. , first of all check for this wire rub and see how bad yours has worn through. its on the side that lays agains the ac compressor hard line joint. If thats not it then I would make sure the primer ball is hard and try to start it. Get someone to prime it as you try and start., Get ratings and reviews for the top 10 gutter companies in Russellville, AL. Helping you find the best gutter companies for the job. Expert Advice On Improving Your Home All Projec..., This Duramax was towed in for a cranks no start condition. No Codes related to the issue. Fuel system had lost prime due to a leak on the suction line betwee..., 2011-2016 6.6L LML – LGH Duramax PDF: 2011 – 2016 6.6L LML – LGH Duramax. Basic Common Rail Info; No Start – Hard Start; Black Smoke; Misses – Cuts Out; Knock; ... Confirm actual versus desired rail pressure, even under crank no start conditions; If the above check good, then it comes down to the following. a., There is NO FUEL PUMP ON A DURAMAX. The injection pump pulls fuel from the tank, through the filter, and into the injection pump [CP3]. [if you have a small leak in the filter area- it will suck air and not fuel] The primer pump is a small silver dollar size button on top of the fuel filter-- pump that-- open the bleed screw [small PLASTIC] and ..., If not most likely fuel pressure related. You could be losing psi because of severe items, The Cp4 has a regulator, one on the fuel rails, and the return system. Also, being a common rail system if any injector is hanging open. Hopefully the Cp4 is not failing, which is very common for all LML's that don't have an aftermarket lift pump ...