I have a 100% stock 01 3500 SC 4x4 6 spd 3.54, 190k. Fuel psi 8-11 after filter under load, clean air filter, no codes, starts and runs great but no upper end power. I have ran it with a solus plugged in an monitored boost and it says its making 30 psi, turbo feels good, no boost leaks, we have swapped ecm's and map sensor with no change. I have down loaded a smarty on highest setting with almost no change. No power and no smoke even with smarty. I have even disconnected exhaust with no change. Has anyone ever experienced a VP failure with these symptoms and no codes? I guess thats probly what i will try next. Open for ideas though.

Somebody must have a guess?

Has anyone ever experienced a VP failure with these symptoms and no codes?

VP44 are know to fail with out codes. As for myself my first and only VP44 failure was a P0216 failure.

Fuel psi 8-11 after filter under load

Fuel pressure is too low you should try to stay above 14 PSI. So I would say its possible the VP44 is wore out from marginal fuel pressure.

Good guess Mike, I put a good used one on it today and problem solved Thanks for the help

3 Things kill Bosch VP44 injection pumps.1. Low fuel pressure 10 is bottom line 14 is suggested minimum.2. Fuel Lubricity Bosch states fuel needs to be 450 HFRR or less. Today fuel is 520 HFRR3. Filtration should be as low as possible. Most stock filters ar 10 micron but I suggest 2-3 micron.

Speaking of better filtration, does anyone know of any 2-3 micron filters for the early 2nd gen vp stock canister? (98.5-99) Ive not had much luck with my local parts store guys. Sorry for the hi jack

Ask AH64ID he's the site filter guru...

I actually talked to him a while back and he referred me to an aftermarket set up to replace the stock canister $$$$I just picked up a perfectly good running raptor 100 with the dual filter set up for 100 bucks so once I get that installed I think Ill be fine as far as filtration is concerned, Id just like to be able to add a finer filter in my stock canister bieng thats the last stop before the vp. That and I probably wont install the raptor 100 until spring, Im going to be dropping the tank to run the 1/2 inch lines and am not up to it in the cold weather. Ive got more than adequate pressure feeding my vp right now, so Im not in to big a hurry.

what was your fuel economy doing before you changed the pump? If it was low, did it come back with the good pump?

I dont know about fuel economy. This is a truck i bought for resale so i've only drove it a little bit