Fuel Pressure Spike

[Jonathan734]

What would cause a fuel pressure spike after letting off from WOT? I checked my fuel pressure today and was about 45 the whole time but when I let off it would spike way up, like 100. Is this just the pump lagging behind my pedal a bit, or is this another problem? Thanks guys

[Jonathan734]

Well I took another read today, and it never got about 30psi at idle. I did it by myself so I couldn't check it at WOT. Could someone tell me where to go now. New fuel pump? What kind should I get?

[strokin_early_99]

Where did you tap in to reading the pressure?

Where is the gauge?

[Jonathan734]

I checked the fuel pressure from the bolt with an allan in it in front of the fuel bowl. I started a thread in the motor problems section on where to check fuel pressure and you replied to it. It is the place whre you told me. It checked out fine yesterday, but when the truck started to act up again I checked it and it was WAY low (aprox. 28psi).

[strokin_early_99]

I would start at the tank and work my way forwards. I have herd of a few trucks that had algae in the thank and it clogged the pickup in the tank.

To get a spike is not normal. I am thinking it could be a plugged pickup. When it warms up does it have more pressure?

Can you see the gauge when you drive the truck? if not can you add a piece of hose long enough to get it to the cowl so you can see when you drive it?

[Jonathan734]

Well I guess I could drop the tank and check it out, but the fuel pressure actually gets lower when it gets warmer, like it could have some crap in the tank that gets worked up. I cant see the gauge when I drive, I will look into getting it up to the cowl.