LMM Help 2007.5 - Chevy and GMC Duramax Diesel Forum
2007.5 + (GMT 900) Non Powertrain--New Body Style-- Discussion 07.5 - 2010 Topics Not related to the Powertrain, interior, suspensions, body, wheels, tires, ect.

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post #1 of 8 (permalink) Old 11-27-2019, 03:21 AM Thread Starter
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LMM Help 2007.5

I put a FASS system on my truck a week ago and has ran fine. I just purchased and installed a full egr delete with y-bridge, fuel filter delete kit, and new deleted exhaust. After installing everything including the tuner it started then quit. We had removed a couple fuel lines to remove y-bridge so i assumes there was air in the line. We then got it started after priming it. I went for a drive and it ran like a dog. If you barely pushed the gas it ran normal. If you got in it at all it would fall on its face. After a few times the fuel rail pressure code kicked in. I figured once again air may have been in line. I then reset the code and it started right up and ran fine. Drove 45 mins home and ran fine until right at the house i tried getting in it again and same thing happened. I then left the house for a long drive and for the first hour or so it did fine. Then the code just kept happening and limo mode until now it won’t start period. Had to call a wrecker for it. With the fass system don’t see why this would be an issue unless it was the filter delete. Any help at all would be appreciated.
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post #2 of 8 (permalink) Old 11-27-2019, 05:52 AM
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Im just guessing you do not have a tune that will compensate for the EGR and DPF delete.

2008 Silverado 2500HD CCSB LTZ Diesel
FASS 95 Lift Pump (with Baldwin filters), Edge Insight CTS Monitor on a Windshield Mount, Nicktane Fuel Filter Adapter w/ CAT 306-9199 UHE tertiary fuel filter, Bilstein 5100 Stock Height, Bushwacker Bed Rail Caps, AMP Research Bedstep, Fumoto oil drain valve, Dorman PS Oil cooler, Pioneer AVIC 7200NEX GPS/Stereo, Air Lift LoadLifter 5000 Air Bags.
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post #3 of 8 (permalink) Old 11-27-2019, 07:06 AM Thread Starter
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I have a H&S Tuner with full delete tune
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post #4 of 8 (permalink) Old 11-27-2019, 09:45 AM
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You might consider contacting H & S on what you actually have and what functions it’s suppose to do and doesn’t do.

2007.5 GMC Sierra 3500 SRW L.B."BLACK" C.C. 4X4 LMM Z71
DIY stock airbox mod, aFe ProGuard 7, OEM drop-in
EFILive ECM ATP - Heavy Tow Tune with Turbo Brake.
EFILive TCM Duramax Tuner
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2007 Yukon Denail "BLACK" 6.2 gasser
DIY stock AirBox Mod, K&N, Airaid intake, EFILive TCM only tuning
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post #5 of 8 (permalink) Old 11-27-2019, 10:14 AM
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Correct me if I am wrong but H&S is out of business?

2015.5 gmc Lml 2500 slt double cab no modifications
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post #6 of 8 (permalink) Old 11-27-2019, 11:03 AM
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If you deleted your OEM filter with the primer pump then you can't do this but if it is still there try priming it by hand. If it is solid to start with then you have a bad CP or a pressure regulator that is stuck open. Your CP3 is pretty reliable so I would check the regulator first. It could be as simple as a connector that got pulled loose from the regulator. It is under the a/c compressor so you will have to do some digging to get to it.

If you don't have the primer pump still in place then I would disconnect a line as close to the CP as is convenient and see if it flows lots of bubble free fuel. If it doesn't flow then find out why your lift pump is not working or why the line is plugged. With all of your messing around it is possible that the fuel line got pinched somewhere. If there are bubbles then something upstream of the lift pump is leaking air or even the lift pump itself.

It is also possible that your draw straw is leaking air in. It might be time for a sump.
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post #7 of 8 (permalink) Old 11-27-2019, 12:03 PM Thread Starter
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Well I called a mechanic friend and he asked when I did the filter delete if I took the spring and ball out since the fass system can’t use that which I didn’t. Mine didn’t come with instructions so I missed that part. Had I watched the video on YouTube I would have known but thought it was simple to just exchange. Hopefully this works will find out shortly when off work
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post #8 of 8 (permalink) Old 11-27-2019, 05:01 PM Thread Starter
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Well that was the fix that made it work. It runs like a scalded dog now. Thanks for everyone’s input
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