Lml duramax low fuel rail pressure. If additional debris that can NOT be picked up with a magnet (Contamination) is found on the Fuel Pressure Regulator 1, Fuel Rail Pressure Sensor, and/or Fuel Pressure Regulator 2 (Pressure Relief Valve), refer to PIP5370 and Contaminants-in-Fuel Diagnosis. Chevy/GMC 2011-2016 LML Fuel System 2011-2016 LML Duramax Lift Pumps, Injectors, & CP3 Conversion Kits GM LML Duramax replacement & upgraded CP3's, Air Dog & FASS lift pumps, Injectors & Nozzles, and fuel tanks, WIF plugs, banjo bolts, and much more! Click below to find what you're looking for or give us a call or chat for assistance. Truck hit 300k miles last week, and developed a fuel knock while towing a vehicle back to my shop. 6L LML Fuel Contamination Kit XD517 is an all-inclusive kit that provides everything you need to get your 2011-2016 GM 6. I removed the FASS pump and replaced the fuel filter, but the issue still occurs randomly. Start with a Fuel Filter Replace it with a quality brand (Baldwin, Donaldson, or Racor) Check for metallic shavings — could indicate CP4 failure (LML) 2. 8 I have low fuel pressure, max ive seen after 10 mins of running and revving a bit was 24 psi, just did 2 new pumps (dont use rear tank) so i did the front in- tank and the hp on the frame rail did fpr and fuel filter, bypassed the tank selector, still starts but still has low fuel pressure I really doubt the line is clogged up somewhere 11-16 GM 6. DHD's Deluxe LB7 Low Pressure Fuel Hose Kit includes all engine related fuel supply and return hoses for 2001-2004 LB7 Duramax Diesel pickups. When the CP4 injection pump fails in your truck, it often sends contaminants through the entire fuel system. Feb 19, 2024 · I have a 2011 Silverado 3500 with an LML 6. May 4, 2021 · Hey y'all! Got a question on the lml fuel system So I replaced the engine in a 2015 lml with a 100k mile engine. Pulled the driver side rail pressure relief regulator out, doesn’t seem like its stuck open or gummed up. This results in . 6L Duramax. Bostech's DE6301116NP Fuel system contamination kit with no pump for GM 6. Jan 27, 2025 · Low fuel rail pressure cripples performance, causing rough idling, hard starts, or even engine shutdowns. This diesel lift pump mounts to the frame rail using t. Verify the fuel pressure sensor and fuel pump operation first. 6L Duramax LML engines has all the components needed to overhaul your fuel system and get you back on the road. It cranks but wont start and while cranking rail pressure only shows 260-300 Sep 20, 2025 · Verified cam and crank signal seems to be good. This is the AirDog II-5G DF-100-5G fuel system for the 2001-2010 Chevy/GMC Duramax 6. It’s getting fuel to the rails and injectors, just not pressurized. Found in millions of late-model diesels, including Ford’s 6. This issue is notorious in Duramax engines, often linked to failing CP4 pumps, clogged filters, or sensor errors. 7L Powerstroke, GM’s LML Duramax, and others, the CP4 has developed a reputation for sudden, catastrophic failures that can destroy an entire fuel system. 1 (one) line only. These molded hoses often crack and deteriorate over time leading to leaks and hard starting issues. It's throwing a fuel rail pressure low code with pressure fluctuating from 3300-9700psi. Will hit on a very minimal shot of ether. Monitor Desired vs Actual Rail Pressure Use EFI Live, AutoCal, or Tech 2: At idle: both should be ~4,000–6,000 psi At WOT: desired ~23,000–26,000 psi If actual falls 2,000 Low rail pressure post-head gasket repair can stem from improper fuel system bleeding or faulty fuel injectors. GM part number: 12670471. Feb 6, 2026 · Sounds like you have fuel knock check rail pressure make sure it's around 27-29000 psi if not pull the return line on the driver's check for flow if you have any pressure from the return either This is the AirDog II-5G DF-100-5G fuel system for the 2011-2014 Chevy/GMC Duramax 6. Rail pressure (actual) is meeting commanded pressure, DHD's Deluxe LML Low Pressure Fuel Hose Kit includes all engine related fuel supply and return hoses for 2012-2016 LML Duramax Diesel pickups. . Truck has been def deleted with a basic tune, and has run flawless for the 3 years that I've owned it. Let’s dive into the causes and fixes to get your truck back on the road. 6L LML Duramax Diesel 4 or 5 Injector Line General Motors OE replacement LML Injector Line. The truck will randomly sputter and pour white smoke out of the exhaust. Due to running production changes, the hoses in this kit will provide only partial coverage for 2011 trucks. Will replace number 4 or 5 line. 6L Diesel. May 27, 2025 · If you’ve spent any time in the light-duty diesel world, you’ve likely heard about the notorious failures of the CP4 high-pressure fuel pump. Has 8psi of lift pump pressure and good solid flow direct to cp3. 6L Duramax LML back on the road. Jan 19, 2026 · 2013 LML Duramax – intermittent sputter + heavy white smokeI’m having an intermittent issue with my 2013 LML Duramax. Feb 9, 2026 · 89 5. The XDP Duramax 6. May 12, 2025 · 🧪 Step-by-Step: How to Diagnose P0087 & Low Rail Pressure 1. This diesel lift pump mounts to the frame jig in front of the fuel tank for a clean looking installation. flf asf nam ncr niz vno vbv tmu hrt mez bdd hyk nlj agd hqt