Hi all,

I have a 2002 F150 4.2L V6 with 261,000 miles. I've been doing a bit of my own work on it lately, which has been both fun and rewarding, but I've had a few questions along the way.

So I recently got an OTC 5630 fuel pressure gauge and hooked it up tonight to see what's what. My Chilton F150 repair manual says the fuel pressure at idle should be:

30-45 psi. (Vacuum @ regulator attached)
40-50 psi. (Vacuum @ regulator detached)
30-40 psi. fuel system hold pressure (5 minutes after key off)

My fuel pressure at idle is a little under 32 psi.
With the vacuum detached, it's 40 psi.
Key off, and waiting 5 minutes, the fuel system pressure is 28 psi.

The only reading that is a little below spec is the fuel system hold pressure, but it seems like a 5 psi drop might be normal, if looking at the upper range of numbers. Do you think that a 3.5 psi drop in 5 minutes is anything to worry about or look into? Or maybe just keep an eye on it?

I suppose the bottom of the scale fuel pressure might be just because of the original equipment and the high miles? I put a brand new fuel filter on a few weeks ago, and recently had the injectors out to inspect, bench test, clean and replace o-rings.

 

Sounds like everything is good. As long as it is holding pressure after 5 minutes, it is fine. I am assuming that it starts on the first try after sitting, if so then all is good.