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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

Good afternoon, I put a titanium fass lift pump along with a Fleece sureflo sending unit on my 2001 pickup about a year and a half ago. It’s been flawless for a few thousand miles. I had been noticing some slow starts when warm. Not bad just a few more revolutions than what was normal. I put some NAPA cross referenced fuel filters on because I didn’t have FASS replacements and didn’t have the time to wait . I started to take a trip recently and fuel pressure dropped significantly. I got the truck home and parked it for a month . I wasn’t real confident about the NAPA filters so i replaced with the direct replacement FASS filters. Test drove the truck for an hour or so and all seemed fine. Today it did the same thing again. I had gotten 17-19 psi at idle and 15-17 WOT. Today it dropped to 15 idle and drops significantly at WOT. I talked to tech support at FASS and he mentioned something about a valve in the VP 44 might be a problem. Now when I turn the key on PSI jumps to 17 and drops to zero momentarily when I start the pick up. I’m in the process of putting a mechanical gauge in line to verify that the brand new auto meter pillar gauges are not the problem. Does this sound like a VP44 problem? Truck only has a 160000 miles, but I assume VP44 and everything beyond is original equipment . Thanks, Kevin

Congratulations!

Sorry Im not closer, Id give you a hand

JIC really is the best way to go with any pressurized hydraulic or pneumatic connection

I grew up n Tx. I understand 😁

Weather is still not conducive to a lot of wind therapy where I’m at. Lots of time for maintenance on my FLHC and FLHTCUI . Looking fwd to a long ride in May

I was just making plans to reseal my OEM vacuum pump and replace PS pump. Glad I found this. Thanks for sharing fellas , I’ll share when in done

Can you please remind me how to edit my signature? TIA, Kevin

Congratulations

Good check up?

So,I have an 01 with nv4500. 4x4. When I bought this thing a year ago it needed tires real bad . I bought it in Couer d alane, ID with 3 may pops and a will pop lol. Looking to buy tires before I drove I it home to Wa coast I ignorantly looked for 35’s and rims and would have bought them if they would have had them in stock. Thankfully I ended up buying stock size L285/75R16 on to the stock rims. Did all of these pick ups come with the same rear end gear ratio? How can I figure my gear ratio?

Is the rear end on these trucks heavy duty enough to stand posi traction? Am I going to snap axles or anything else? Any reason I shouldn’t do this?

Yeah I got stuck in the sand the other day. I wouldn’t have if it would have been posi traction. I’ve never needed to get into a differential. Pretty straight forward install?

What are my options for upgrading rear end to posi? 2001 4wd 2500

What are the benefits of 35 spline shafts, high pinion housing and 3.73 ratio?

I just scrolled this whole thread. Amazing work. Thank you for sharing your time!