Fuel Pressure Question 96 PS

[Bilderberger]

I've installed a fuel pressure gauge on a 1996 PS, it has a mechanical pump driven off the cam in the engine valley.

My fuel pressure gauge is bouncing all over, back and forth with each cycle of the engine...is this "normal" for a mechanical pump to display pressure in this way?

I've installed the fuel pressure gauge as part of the WVo conversion.

I'm seeing pressure from 20lbs to 60lbs..from i can read . Needle in pressure gauge is actually "noisy", which running on diesel. When i switch to WVO, which has an electric pump, then gauge stabilzies at 70 psi.

phil

[seadog]

Sounds like you may have a weak fuel pump.

http://www.powerstroke.org/forum/94-...-pressure.html

[Bilderberger]

Well, i changed the fuel filter, cleaned the screen going into the FPR which was full of soot, and changed the fuel pressure gauge...didnt' change that much....

I then changed out the mech. fuel pump, getting "better " pressure, so i eliminated that problem, changed all the "fuel lines", 4x of rubber lines, and upgraded all the clamps...

Appears to be getting better pressure, but have elminated this as a potential problem...this truck is going into daily service in a few days...so don't want any obvious issues coming up.

ALSO...FYI...WVO designs solenoids will NOT hold backpressure against the switch to the 3rd port...am solving this with a checkvalve

Phil