A good friend of mine gave me a new factory lift pump to put onto my truck. My old pump held 10-12psi at idle and went to 0psi at WOT. My new pump gives me 10-12psi at idle and goes to 5psi at WOT. Is this normal for a factory block mounted pump?
Also I have been reading on here for a solution and noticed alot of people mount their fuel pressure guage to the banjo bolt on the IP, how do you do this, do you need an aftermarket fitting? I simply took out the alen head bolt that is just below the banjo bolt and screwed mine into that hole. Is this a bad location?
This is my work truck and I need it running right before tomorrow, I will haveno time to play with it until next weekend.

 

0 psi at wot isn't some thing to worry about, unless you are wide open all the time, but i don't think ANYBODY has that condition........ do you have any performance issues?
my campaign pump gives me 12 to 15 psi at idle and 4 to 5 psi when i pull my fifth wheel trailer hard (my low pressure warning light flickers) i never have wot condition

 

Here is an update. I just test drove the truck and I have about 5psi at normal driving condition and even lower up hills. I can pull it to 0psi at WOT. I just put on a new pump and filter. Could this be normal for a stock pump or do I have other issues? Truck runs great but I don't want to hurt the IP, it makes my *** pucker just thinking about it.

 

Nope it's not normal for a stocker mine did what yours is doing when it went out. I had 10 psi at idle and drew it down to 0 psi at wot or going up a hill. Anytime you hit 0 psi your injection pump is not getting enough fuel to cool it and is having to work harder to draw the fuel to it which makes it heat up more. Yeah a bad cycle to be in beleive me, aslo an expensive one been down that road before. A holley blue pump or any of the others are cheap insurance against having to buy an IP.

Take it easy on it and get either a walboro or a holley (pro-comp is the same as a holley but cost less) and fix it for good. I'm talking from experiance I thought that 0 psi wouldn't if it was just every great once in a while until I bought a new injection pump for $1200.

 

My issue with this is, I just installed a new pump and it is only giving me minimal psi. I know that the stock pumps aren't much, but wondering if I may have something else wrong since this is a brand new pump

 

it's probably a bad pump.

 

If you search the forums you will find that this happens all too frequently. Those pumps are not up to the task IMO. 0 at WOT is unacceptable as others have said; anything less than 5PSI is not good, and I would hate to see anything under 12PSI ever as far as I am concerned.
Good luck
mishkaya

 

Well I am at a loss. I am not sure what to do next. Driving the truck today it never went below 5psi unless I stepped into it. i do like to have alittle fun with the truck, but now I am afraid to step on it. I have a holley black pump laying around that I took off of my race car and upgraded to an aeromotive pump. Should I purchase a big line kit along with the fuel tank straw and put the holley black on until I can buy a FASS? Also, do I need the fuel tank straw with the big line kit? Is it cheaper to buy the fuel line and fittings locally, or buy the kit for $99 ?

 

Check the suction side of the pump. right under the drivers seat, on the inside of the frame rail, there is a transition fron the rubber line to the steel line from the tank. I had the sort of same problem. two hose clamps fixed it. The transition get loose and lets the pump suck air.
Bob H

 

I appreciate that idea. I think I may put a hose clamp on every connection in the system, when installing the pump, I was not happy with how the clamps were holding the line but thought it would be ok. I was able to remove one line without even taking off the clamp.

Noone has answered my question about mounting the fuel pressure sending unit. Does anyone know??

 

all vp 44 pumps will fail regardless of lift pump pressures, the VP 44 as it came on the truck will fail at or before 200,000 miles
they are junk!
mine went out at 181,000
my first lp was gone for thousands of miles at around20,000..... no effect on vp 44
when the electronics go bad no amount of fuel pressure will help

 

You are talking fuel pressure sending unit, so I am assuming you have an electric gauge as opposed to a mechanical gauge. Most people use either a tapped banjo bolt, or get a cover for the fuel filter that is drilled and tapped. I would suggest putting the sensor as far away from the VP44 as possible as the vibrations tend to kill them. I am not sure from your description where you have connected the sensor. Could you be more precise?

 

If you are talking about that allen bolt on the VP44 that sits below the banjo bolt. I don't think that is a good idea. I am not quite sure what it is for, but you should be checking pressure on the fuel inlet line only. Hope this helps a bit.
mishkaya

 

If you've got an electric fuel pressure gage that may be your problem. I had a similar problem with it reading incorrectly. I changed the sending unit 3 times before I switched to a mechanical gage. I had a snubber and a needle valve, but still had problems with the sending units.

I have the campaign pump on mine and it reads 15-16# at idle and doesn't drop below 11-12# with the mech. gage. I installed the pump down on the frame rail with a big line kit and a shut off valve so I could change it easily.

 

"all vp 44 pumps will fail regardless of lift pump pressures, the VP 44 as it came on the truck will fail at or before 200,000 miles"

Wow. I better tell my buddy that has well over 700,000 miles on his FACTORY VP about this.