Fuel pressure question
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Freshman User
Joined: Jul 2009
Posts: 42
Likes: 0
From: NSB, Florida
Fuel pressure question
When I put a fuel pressure gauge on my truck I get an erratic reading. The needle bounces between 42 and 70 psi at idle. I was going to do the FPR shim and now am unsure with these readings. I put on a tire gauge to rule out if my fuel pressure gauge was bad and got the same numbers. So my question is how do I read this or should the needle not bounce?
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
That's normal. Just use the highest reading you see. BTW: your readings are OK, no need to shim it.
It's mechanical pump and will produce pressure spikes. The cali emission engines have a damper that helps reduce those spikes.
It's mechanical pump and will produce pressure spikes. The cali emission engines have a damper that helps reduce those spikes.
Posting Guru
Joined: Nov 2008
Posts: 1,138
Likes: 0
From: Lakewood, Colorado
but mine is just below 40 right now with a mangled spring... i will have the new spring and plug and tappet friday... 40 will do for now though...
