GMC Fuel Pressure drop

svroom · 08-21-2008, 01:40 PM

1998 GMC K2500 7.4L EFI. Hard starting prolonged cranking, poor power on hard acceleration. Fuel pressure runs at 55 PSI. (Book says 56 - 62 PSI), drops to 40 PSI when I turn the key off, then slowly ( 1 minute) slides to 20. 55 PSI when running.

MrCritical · 08-21-2008, 02:17 PM

The 56 lbs is the absolute lowest it will stand, and run correctly. It needs to be somewhere in the middle to high on the pressure range.

08-21-2008, 01:40 PM	#1 (permalink)
svroom Walking Join Date: Aug 2008 Posts: 1	GMC Fuel Pressure drop 1998 GMC K2500 7.4L EFI. Hard starting prolonged cranking, poor power on hard acceleration. Fuel pressure runs at 55 PSI. (Book says 56 - 62 PSI), drops to 40 PSI when I turn the key off, then slowly ( 1 minute) slides to 20. 55 PSI when running.

08-21-2008, 02:17 PM	#2 (permalink)
MrCritical 3.8 Liter V6 Join Date: Aug 2008 Location: South Of The North Drives: '08 GMC Canyon Posts: 424	Re: GMC Fuel Pressure drop The 56 lbs is the absolute lowest it will stand, and run correctly. It needs to be somewhere in the middle to high on the pressure range.

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