2003 Yukon XL 2500 6.0 - Just rolled 198k
Having a minor bump in idle with a slight intermittent straining/whining sound that sounds like it's coming from the fuel line. When I touch the FPR I can feel the vibration and hear the sound coinciding. I've done a slew of 'peace of mind' maintenance since I bought it back in Jan of this year.
AC Delco Fuel Pump
AC Delco Fuel Filter (twice for troubleshooting)
AC Delco FPR (twice for troubleshooting)
AC Delco spark plugs
MSD wires
1Aauto coil packs
AC Delco 145A alternator
AC Delco OPS
AC Delco water pump
AC Delco coolant cap
Stant Thermostat
Coolant Flush
Fel Pro intake gaskets
AC Delco knock sensors
Dorman knock sensor harness
MSD wires
1Aauto coil packs
NO codes, NO other issues besides the bumpy idle and the straining noise coming from the fuel line. Under WOT it feels fine, but not as strong as it should be...if that makes sense. Cruising speed is fine too.
Fuel Pressure reads 56 PSI, key on, engine off. 48 PSI, key on, engine on. Pressure holds at 55-56 PSI when shut off, so no suspicion of leaky injectors. While engine is running, removing the FPR vacuum line raises to 60-62 PSI, no fuel coming out of the new FPR.
I'm suspecting a bad New fuel pump or clogged fuel line somewhere in between the fuel pump and FPR?
Might be a weird question, but could a bad gas cap cause low fuel pressure? When I fill up at the gas station I don't hear any pressure relief when removing the gas cap...is that normal?
Thanks all,
-Tom
Having a minor bump in idle with a slight intermittent straining/whining sound that sounds like it's coming from the fuel line. When I touch the FPR I can feel the vibration and hear the sound coinciding. I've done a slew of 'peace of mind' maintenance since I bought it back in Jan of this year.
AC Delco Fuel Pump
AC Delco Fuel Filter (twice for troubleshooting)
AC Delco FPR (twice for troubleshooting)
AC Delco spark plugs
MSD wires
1Aauto coil packs
AC Delco 145A alternator
AC Delco OPS
AC Delco water pump
AC Delco coolant cap
Stant Thermostat
Coolant Flush
Fel Pro intake gaskets
AC Delco knock sensors
Dorman knock sensor harness
MSD wires
1Aauto coil packs
NO codes, NO other issues besides the bumpy idle and the straining noise coming from the fuel line. Under WOT it feels fine, but not as strong as it should be...if that makes sense. Cruising speed is fine too.
Fuel Pressure reads 56 PSI, key on, engine off. 48 PSI, key on, engine on. Pressure holds at 55-56 PSI when shut off, so no suspicion of leaky injectors. While engine is running, removing the FPR vacuum line raises to 60-62 PSI, no fuel coming out of the new FPR.
I'm suspecting a bad New fuel pump or clogged fuel line somewhere in between the fuel pump and FPR?
Might be a weird question, but could a bad gas cap cause low fuel pressure? When I fill up at the gas station I don't hear any pressure relief when removing the gas cap...is that normal?
Thanks all,
-Tom