Installed pump on frame rail July 2. Noted that a very small turn (!/8) of the adjusting nut would increase pressure by 15 lbs. Today, I looked at my guage and it was at 10 lb idleing. Jumped under the truck to adjust relief spring and turned it 1/2 turn to get pressure back to 20 psi at idle, 23 with engine off. Now if I floor it in drive press drops to 7 psi. Drops to 15 at 5lb boost. New stock filter 2 weeks ago. Stock 3/4 ton empty. Stock draw stray and fuel lines to the raptor. Stock line to filter bypassing original pump. Oil filled mechanical guage tapped at the Vp44 inlet banjo. Worked great up to now pulling 12,000lb load. Time for warranty???

Stock draw stray and fuel lines to the raptor. Stock line to filter bypassing original pump.

20 psi at idle

Now if I floor it in drive press drops to 7 psi.

Stock pickup and steel fuel lines are too restrictive need to consider upgrading all of it to 1/2" plumbing.

Time for warranty???

I don't think so yet. I would finish up the upgrade with good 1/2" lines and it should settle down more. I would ditch the stock pickup assembly too and upgrade to 1/2" draw straw as well. If there is any quick connectors I would chop them out and upgrade to Push Loc's and JIC fittings.

Like Mike says, change your lines. I recently had my stock fuel cannister die on me. Had 1/2" line from the tank to the fuel filter and the stock line to the VP. At WOT, my psi would drop about 3.5 psi. Instaleed 1/2" line from the tank to the VP. Now 2 psi drop at WOT. I have been reading some where about the big line kit and the importance of it, can't remember where though!

This morning verified no intake problem. Stuck intake in a clean fuel can. Pressuse was all over the place. Started at 60 on yesterdays adjustment. Cranked it back to 20 then it went back to 10. Jogged the ign to run the pump with motor off and I could hear the pump run intermitently. Not 25 seconds, only 5 seconds with guage bouncing. Fired up engine, pressure back to 20. Shut off and jog key again. Started to pump 23psi for 10 seconds then got intermitent again to about 10 psi with guage bouncing. Went to ck elect plug,found fuel coming out of wire conection on top of the elect motor, down the wire loom and into elect plug. Warranty replacement pump on the way.

Warranty claim... Regulator problems internally.

I don't think it was a regulator problem. It was running intermitently. The elect moter has to be full of fuel for it to leak fuel through the hole where wires enter the motor 1/8 inch from the top.

I don't think it was a regulator problem. It was running intermitently. The elect moter has to be full of fuel for it to leak fuel through the hole where wires enter the motor 1/8 inch from the top.

Ahhh... Another one of those shaft seal problems...