Just changed lift Pump..Help!!!

[DGFoster]

Hi all,

Truck ran great,but I changed the lift pump because it was reading 9psi at idle,but anyway I changed the pump and now I can barely hear the pump run,the old pump I could hear it just fine.

When I bump the starter I can hear it just for a split second,I was always told it should cycle for 25 seconds.

The truck runs fine,but is this normal for it to sound like this.

I don't know what the pressure is because someone stold my gauge,I had it taped to the windshield til my 3 pod gets here,so someone swiped it,I have another coming



Any feedback would be great. . thanks

 

[Bigsaint]

Dave, this may be a stupid question... are you sure that you are bumping the starter, or are you just turning the ignition to the on position ? By bumping the starter, you are actually letting it crank for just a split second, then releasing, which should provide power through the ECM wire to the pump for about 25 seconds.



Scott W.

 

[DGFoster]

Yes I am bumping the starter and I only hear it for a few seconds

 

[overfueled]

PSI

I changed out three lift pumps all got 15 psi running and 1lb wot.

By the way I have herd if you are going to make smoke make lots of it (it is harder to get your plate #) This works!



I just sent to Jannetty Racing for a Fuel up grade. A set of 100GPH Lift Fuel Pumps, new lines and fittings to the injector pump. My present problem is at full throtle I get 1 pound of fuel pressure and the truck engine bucks like someone shut the fuel off and on 3 times fast between the rpm range of 2600 - 2800 after that things are fine but I still get a low fuel pressure warning on my FMS from Blue Chip. I have an 01 with HX35,14cfm turbo, DDII, A Blue Chip FMS, Puck Timing Box, Trans shift Kit



After 3 Months and three new fuel lift pumps, no one knows what to do. The latest "fix" was a new ECM from dodge all this did was put the truck in "limp mode" I went back to the old one. And back to the same problem. The next trick is a new converter, the thought is that the tuck is spooling up to fast and sending a code to the ecm to shut down the fuel at the VP-44 until after the curve is over. Will see.

Thanks Steven TDR Member

 

[Lsfarm]

Lift pump noise

Hi Dave, I think that a pump makes more noise as it gets older and worn-out, the new one may be so quiet that you can't hear it.



Come by tomorrow and let me listen to it.



Greg L

 

[chuck3]

Dave, Go back and look for a thread titled ( how long does your lift pump run. ) Most of the guys who had just changed over to the newer pumps reported very short times like you because of the effenency of the new pumps. I think your pump is probable ok.

 

[High Voltage]

Mine also was at 9 psi at idle,and 0 psi at WOT,changed pump out last week,now it's 15. 5 at idle and 8-9 at WOT.

Mine was also very hard to hear,but she work's great,and runs the same amount of time as the old one did,even after a weekend of drag racing.

 

[DGFoster]

I can hear it and it is now running about 25 seconds when I bump the starter,I drove it around and and tryed it again and it is ok,just a LOT quieter than the old one.

But I think this is just a temporary fix,im going to explore the best way to setup a second pump back by the tank.

I know there is a few members out there who has done this,and I want to get it right.

Thanks for all the input. .



-Dave

 

[redneckdr]

pusher pump

i put a pusher back by the tank. bought a low pressure (7-9psi) pump at the local parts store for about $40, put in a prefilter. i wired it indpendent of the oem transfer pump. it feeds the oem pump. it is on a switched circuit, with an on/off switch. works great so far. sure makes changing the fuel filter a breeze. either pump will move fuel independent of the other. time will tell whether it extends the life of the oem transfer pump... ... . 3k miles since install... ...

 

[Tomscreek]

Ok guys after reading all this lift pump stuff I have some questions. First off my truck was not included in the lift pump recall (it's a little newer), does that mean it's not going to fail? Second, I don't have any guages so am I able to tell if the lift pump is operating ok by the seat of the pants performance? I would think so. My truck is totally stock, 25,000 miles and runs great. Also I have no plans to bomb, sorry it just runs too good to mess with it and I don't tow all that much. Thanks.

 

[Todd T]

Tomscreek, I'm going to say, you probably couldnt tell if it went out on a stock configuration like yours.



my truck was built in may of 2001 my lift pump lasted until 29,000 miles. the only way I noticed it, was the truck seemed to lay down in the middle of a gear. but I have a Powermax3 added and the extra power would seem to go away, is how I felt it.



the only problem with not ever checking it. is that on most of the guys that just drive thier trucks without checking it. when the lift pump goes, you dont know it, and keep driving it until the VP44 goes. then the truck stops running or stalls very bad and at that point its is too late.



you dont need to buy alot of fancy guages. just get yourself something you can put on one of the fittings and lay it on your windshield. go around the block to see if you pressure stays up under power. then take it back off and throw it in the tool box until next time.

 

[fj40charles]

Tomscreek,



I would be willing to bet you'll have problems with you lift pump. This is based on how the lift pump was originally designed by Carter. Carter states that this pump was mainly designed to "push" the fuel. The max distance for "pulling" is around 3-5 feet or so, but in a quad cab configuration it will be "pulling" fuel for about 8 to 10 feet. You're best bet is to install a fuel pressure gauge so you know when it getting ready to fail. The fuel pressure will begin to show less pressure and will begin to fluctuate before it fails completely.



Charles

 

[Tomscreek]

Thanks guys, great info. Now another dumb question, can you explain how and where to install a fuel pressure guage? thanks again. Oh, one more thing, if I find the lift pump to be bad I assume they fix it under warranty, what keeps it from going out again? Is there a better pump? Sorry for all the questions

 

[DGFoster]

Ok,I had a mechanic friend of mine check the fuel pressure with a mechanical gauge and it was 16 at idle,12 at 70 mph and 11 at WOT,the needle didnt move much.

I called the Cummins in Saginaw to get some info and to see what they say about these pumps,he told me that this is a revised pump,and that they fixed the problem with these pumps,I guess we will have to wait and see,I am still going to set up one by the tank.

Thanks for all the help guys. .

 

[Bigsaint]

Tom, you can check your FP at either of the two Schrader valves, one is at the rear (inlet) of your fuel filter canister and the other is at the inlet of your VP44 injection pump. You'll need a -4AN fitting to adapt to the Schrader valve and you must remove the valve before you hook up your gauge. You can get all this stuff at either Jegs or Summit racing, both are online.



Scott W.

 

[DGFoster]

Well I got my gauge on it today,the new pump is running 16 psi idle, 12psi @ WOT,it sure made a big difference as far as psi goes.

 

[DGFoster]

Im starting to get fluxuation on my fuel pressure gauge,sometimes it reads 16 at idle,and sometimes it reads 12 an idle,going down the road at a steady pace,it will slowly fall from 15. 5 to 10 to 12 and back up.

Is this pump going out also?