Hmm, is that extra 5 psi really detrimental? I guess you're gonna find out ...
2015 GM 3500 6.0L - Need help with engine stumble
- Thread starter burbguy82
- Start date
Does it have a Fuel Pump Control Module? Is it Flex Fuel?
No on the flex fuel, it is gas. My scanner does not recognize it having a module. When I command "ON" the guage goes to 65 psi maybe 66, then back to 60. While running 65 or 66 constant.
What are your thoughts?
If no module, Then it has a Pressure Regulator in the fuel pump housing/module. Replace the fuel pump. Wonder if it's aftermarket?
No it is original. I have had the truck since new, and it has not been replaced. I just went out, and verified that it does not have an FICM, as it lists it as "not equipped". It does have two tanks, one small 20 gallon and one big 40 gallon, so I am sure there is a module of some kind that balances the tank. But to my knowledge, there is no fuel module.
FPR. intank intergrated with pump i think. The jerk at the dealership would not give me a part number to refence so I could look it up and see what was on it, but, the FPR is supposed to regulate to 60 max, and when I turn the key on if goes to 65 or 66, then down to 60. After I start it, it jumps back up to 65 nad there is not change in pressure when i snap the throttle.
I did under your advisement, clean the injectors, and it did smooth out the idle, but trims were still in the -15-18 range. Got new vin matched injectors, and runs smooth, mostly, but trims are still negative. Replaced EVAP solenoid, with gm part, and seemed to have a slight effect on trims, but them went back to -15 or so.
and, of course there are no stupid DTCs, i suppose +-25 is the threshold.
I also reset the fuel trims several times and fuel comp always shows 0% alcohol
2500/3500's have higher emissions thresholds.
58 PSI is the spec for Non FPCM models....Not that I've seen FPCM equipped LS/LT trucks vary much from 58 PSI.
so you would agree that 65 is high? Pretty weird IMO
You can read the tune & know the max fuel pressure setting.
Ok thank you! I ASSumed it was a PID
So they got it today at one of the local dealers, and yep, they ordered me the wrong one. I told them I needed the front tank pump, and with a small bit of questioning, figured out they had me the rear tank.
I wish they just used a simple transfer pump that could not be misconstrued with the front pump, which brings fuel to the rail.....or better yet, just have a transfer pipe between them.
that one is going to be a bear to do. I am going to remove some exhaust to get easier access. CM out of Denton TX did the bed, so access is maybe different from pickup.
I pulled the tank on a 2017 2500 Duramax not to long ago & was pretty easy, The exhaust is on the passenger side on both diesel & gas trucks.
Remove the 3 screws on the filler neck mount, Remove plastic shield if equipped, Disconnect the lines, Remove the straps....Shift the tank away from the frame rail & disconnect the filler hose, Lower the tank 'til you can unplug the electrical connector.
Remove the 3 screws on the filler neck mount, Remove plastic shield if equipped, Disconnect the lines, Remove the straps....Shift the tank away from the frame rail & disconnect the filler hose, Lower the tank 'til you can unplug the electrical connector.
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