So I just got my gauges switch over from my 01 truck to the 02 truck both are 3500, I need to change all my truck info those two trucks are gone in my sig. But anyhow I have a snubber and a needle valve in the 1/2 in fuel line going to the vp44. Well when I first fired it up fuel pressure was 20psi and it stayed there for 30 seconds or so and went down to 17.50 and pretty much stays in that area. I took the truck down the road for 2 miles and back and on my way back it climbs to 20-21 psi and has stayed there, shut it off fired it back up and still 20psi. I removed the spring airdog150 pump came with and put the 17psi spring in. Im wondering is spring in a bind or is my gauge acting up, fuel gauge is a pricol and its probably a 10 year old gauge. And is 20 psi ok to run at?

Are you saying the 20 lbs and fluctuating is with the new spring? Did you replace the ball too? Maybe it has irregularities to it. 20 is at the upper limit. Don't want to go much over that to avoid damage to the seal on the VP. 

Did not replace the ball just the spare spring, its supposed to be a 17 lb spring. I think ill put the old spring back in it and see what happens.

 

Edited January 31, 20223 yr by jlwelding

I would leave it for a time. Just watch and see if it settles later on. Lot of times it does.