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Great write up thanks. Ok, help me with this please . Where does it get the power assist from? Years ago I had to change out a vacuum booster on a gas pickup I had, but this being a hydro booster I’m assuming from the PS pump?

100 GPH. Spellcheck got me

It seemed like I might have had another bad relay , so I jumped it, pressures were all over the place, from 20 to 12psi varying rpm’s. I did another bucket test had a constant 15-16 psi for an hour. Hooked the pump back to the truck, keyed it on psi went to 20 briefly while the truck warmed up then psi was all over the place 20 to 12…. FASS is leaning heavily towards OFV in VP 44. IDK

That’s right, same symptoms after 100 miles or so and it seems I’m starting to get the not answer the phone/ not call back run around game on the lifetime warranty from FASS as it now seems to be an electrical issue in pump, best I can tell. Just ordered one. Unfortunately, I have to go back to work and I won’t be able to get back on this with the code reader until February.

Can you recommend one? I’ve been meaning to get a quadzilla . Does that have code reading? Or maybe just a basic code reader for now?

I had a scan gauge on a power stroke. It worked well. Can you suggest one for this pickup.

I’ll definitely take a look as soon as I can get back on it. I just realized I have a P1693 code. I also have not yet done the W-T ground wire mod. I’m starting to wonder if this is what’s giving me relay problems

I have a service manual but , have not opened it up for this yet. Why is there a return tee and not just a single discharge to tank? I’m pulling and returning from a new fleece sending unit. I’m not sure there is a check valve there . I did a bucket test the other day and confirmed the relay was cycling on and off. Replaced relay and it seemed to have fixed the problem…. Not

I assume you’re talking about an internal check valve in the pump? I can’t open up pump without voiding warranty. While I got ya , the square cut o rings you mentioned, are they for the return on back of head?

Seems to have fixed it for 100 miles or so. Odd, going to run another bucket test and see what’s going on…… PIA!

Lost pressure again today on a short trip. Psi dropped to 15 at cruise, 12 at WOT. Got it home , tuned it off, re keyed it went to 18, started , it dropped to zero , but still ran. Shut it off quickly. Going to get on it again tomorrow

Starts right up when cold. Slow start is only when warm. Relay is wired to battery and fuse block. There are no psi adjustments on this pump. If I was to attempt by opening up, thus breaking the seal, it would void warranty. Are these square cut o rings the ones for the return on back of head? What type of thread comes out of back of head? Any way to maybe convert this to a jic type fitting? Something without o rings

These are the o rings for the return on back of head? Fuel pump is back on line. 20+ psi at idle, no less than 17psi WOT. Turns out the problem was the relay. Junk I suppose. This was the relay that came with pump. Eklund brand, I think. Funny, FASS gave me a Bosch part # to replace it with. No one carries Bosch where I live , and rather than waiting on an internet order I replaced with another brand that cross referenced from AutoZone. Still have the slow start when warm though

Lift pump has a lifetime warranty. Hopefully I get it narrowed down tomorrow. I have not even looked for the tee in the back of the head yet as I have not seen any evidence of fuel leaking from there. What’s the best way to access that tee?

Ok, the return line wouldn’t cause the low pressure while running would it Everything is JIC and I beiieve everything downstream of VP44 is stock