Puel pressure question

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Jul 13, 2015 | 04:16 PM

90150xlt

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5th Wheeling

Joined: Dec 2005

Posts: 46

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From: Southern Oregon Coast

Puel pressure question

Hi folks...

Got back from our 1,400 mile 4 day whirlwind trip of the PNW and our quick stop by Harbor Freight to pick up my fuel pressure tester. Got it assembled, hooked up while engine was cool and off. Had zero pressure showing. Started engine, immediately came up to 20-22hg... Revving engine gets the gauge in the neighborhood of 30-35hg, commensurate with the engine revving. Shut down engine, still showing 20hg. The question is this... How long should that gauge register pressure? 30 minute? 2 hours? 24 hours? 24 months? Hahahaha...

Thanks for your best information and assistance. Regards...

Jason
Bandon, Oregon

Jul 13, 2015 | 04:36 PM

'89F2urd

Lead Driver

Joined: May 2011

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The fuel system should hold pressure for hours at the very least.

Jul 13, 2015 | 05:38 PM

rla2005

Fleet Owner

Joined: Oct 2005

Posts: 20,786

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From: Kentucky

And the pressure with the engine running at idle should be 30-35 PSI for a V8 and ~40-45 for a 4.9L six cylinder engine.

If the truck runs okay then I suspect a bad pressure tester.

Jul 13, 2015 | 05:45 PM