ok i know it has been posted before i just cant find it i was wanting to know what are the pressure requirements a vp44 has to have to keep it from bombing.

W.O.T.
IDLE
MIN.
MAX
these are the only things i was wondering about i have a fass 150 so im not really worried im just kicking myself in the rear cause i have 15psi at idle and 11psi laying into the throttle
If somebody could help it would be greatly appreciated

01 ctd ext cab short bed fass 150 1/2" homemade draw straw, silencer ring MIA, diablo power puck for fun, soon to come ladder bars, and transmission goodies

 

Anything over 5 psi @ WOT is considered "acceptable".

I prefer to keep it above 10 psi @ WOT on mine.
I currently have 20 psi @ Idle, and 17 @ WOT with no "Box" and a Blue Chip "X" VP-44 injection pump.

 

Im the the same boat as Shovelhead, I prefer nothing shorter than 8-10 PSI.
I range from 21 at idle down to 13-14 at WOT with injectors and box.

 

Ditto.

 

15-13# with AirDog.

 

Didn't copy/paste very well, but here is what the manual has:


SPECIFICATIONS
FUEL SYSTEM PRESSURES—DIESEL ENGINES
DESCRIPTION PRESSURE
Fuel Transfer (Lift) Pump Pressure With Engine
Running
Minimum 69 kPa (10 psi)
Fuel Transfer (Lift) Pump Pressure With Engine
Cranking
Minimum 48 kPa (7 psi)
Fuel Injector “Pop Off” Pressure 31,026 kPa (310 bars) or (4500 psi 6 250 psi)
Fuel Injector Leak-Down Pressure Approximately 20 bars (291 psi) lower than pop
pressure
Fuel Pressure Drop Across Fuel Filter Test Ports 34 kPa max. (5 psi. max.) at 2500 rpm (rated rpm)
Overflow Valve Release Pressure 97 kPa max. (14 psi.) at 2500 rpm (rated rpm)

 

ditto on shovelhead..
I run 18 at idle, 15 at wot..
watchout for drops with under a 1/4 tank of fuel..yes DROPS!! think 5-10 inches of vacuum here..yes my fuel gauge is a vacuum/boost mechanical gauge.

-dkenny

 

hey everybody i really appreciate the info it really helped me out alot... i only have 15psi at idle i was wondering how i could get more pressure to the vp44 do i just need to get a bigger npt fitting on the fass system or what?

 

don't know about fass but A,D just takes a firmer check ball spring to increase pressure. Or you can stretch existing one out a bit. Nate

 

If you're running a stock Carter-style pump 15psi @ idle is all you're going to get.

Most of us are running aftermarket pumps to get the higher pressures.
I'm running a Glacier/Walbro pump with larger supply lines from the transfer pump to the VP-44.

 

im running the fass 150/150 and i am getting 15psi at idel with the larger supply line to the vp-44 is that all the pressure that i am going to get or what i was wanting it to stay alot closer to 15psi at WOT is that possible or will it always pull it down to 11psi

 

I've been running a FASS 150/150 for about 1-1/2 years. 15 psi at idle and have never gone under 13 psi at WOT or when pulling a 29 foot toy hauler at interstate speeds. That is, until the filters start to load up. It will still be 15 psi at idle but will drop to 10/11 psi under load. I'm using a 1/2" draw straw and a 3/8" line to the VP.

 

guess its time to get my brother to drill a hole for the draw straw before i get my quad/adr and beef up the tranny

 

guess its time to get my brother to drill a hole for the draw straw before i get my quad/adr and beef up the tranny

 

You shouldn't need a hole drilled. I used the existing hole. The only thing I had to do was remove the tank, unscrew the top, cut the bottom off of the plastic cylinder( about a quarter way up), take the grommet out of the "lid" and insert the draw straw with the grommet after CAREFULLY measuring the length needed.
It's not a major operation with one person and even easier with two.