Hi all, been looking over the site and keep finding threads about the piston lift pump. So i'm wondering what's the big deal? Do they have a better flow rate or what?
I'm thinking about replacing my oem pump as i don't know when it was replaced last and i don't want to chance it. However i would like to eventually turn up the pump and possbily do some slightly larger injectors.
So would this piston pump do me any good over the stock unit? About how much can you tweak things in the pump with stock injectors before you run into problems with the oem pump or do you?
Also, is there anyplace besides cummins that you can get the part? I know it's different from the newer trucks, but is there a place where you can get the same part for less than cummins?
Thanks
Brent

 

I'll answer one of your questions. If you remain stock, you'll be fine with the oem pump. Anything other than stock, the oem lift pump can't keep up.

 

So lets say i want to turn up the pump a little for the so called "230 Horse" setting, the stock diaphram pump is inadequate for this?

Also, with the increased pressure, will my 312k mile injection pump be at risk of leaking or being pushed over the limit in anyway?

Thanks
Brent

 

Yes, a fuel pressure gauge would confirm this. It would quickly be down to zero psi. Don't waste your time, get cha one, don't stall. You're not gonna quit after just turning up the pump a little. You said it yourself, eventually turn the pump up and bigger injectors.No. It's a Cummins lift pump designed for use with the VE rotary pump. If you spring a leak, most likely you would have sprung one just down the road with your stock lift pump. Chances are at 312k miles, you have a unhealthy lift pump now. A 3 psi idle, 1-2psi cruise, 0psi at wot lift pump. That's how my high mileage lift pump was prior to switching to the piston lift pump.

It's a Cummins unique part, possibly could get one from a Case/IH dealer, but look to spend the same amount of $$.

Now is Underpsi would spill the beans and let us know how much pressure his 'Bosch' piston lift pump puts out, we might have another source for a cheaper alternative. But I have a feeling he ain't telling, cause he don't wanna hear 'I told ya so' ..

 

I won't want to stop there, but the chances of burning up the autotrans in back of it are really good with this power. So i probably won't until i'm ready to invest in a rebuild. But it is addicting. I thought i would be happy with a 200 hp turbo engine for my subaru, but now it's over 400hp!

I did read the post of the bosch pump, but he never replied. So i guess i'll go with the tried and true method. Is there any "Cheaper" cummins store online then the local parts dealer?

Also, how do you go about installing a fuel pressure guage and really would it benifit me for a lower power level? Installing one would basically tell me how much fuel is going to the injection pump right? Any other reasons?

Thanks for the replies!
Brent

 

Wannadiesel did the piston pump thing, and he has good info on it. I need to do mine also. I have POD's and everything turned up, and my stock (and perhaps original) lifter is leaking slightly. I bought the high flow banjo bolts but am afraid to put them on because the think my lift pump might get sucked into the fuel line

Hey Wanna, what was the part number on that dude again?

Mark

 

Put a fuel pressure gauge on before you throw money at it. If your lift pump makes at least 2 - 3 psi at all times, it is adequate for your current setup. The injection pump has a vane pump at the fuel inlet, as long as it is supplied with fuel at positive pressure everything will be fine.

Go to Geno's and order a tapped banjo bolt and 2 gaskets. http://www.genosgarage.com/CoastalDa...ID=593&CATID=1 Replace the front banjo bolt on the filter mount with the tapped bolt. Install a pressure gauge of some sort in whatever way makes you happy. You will need a snubber of some sort to keep from destroying the gauge from the pulsations, many guys use a needle valve closed almost all the way for that purpose.

Another benefit of a fuel pressure gauge is you know when the fuel filter is getting dirty. You can change it when it needs changing, instead of guessing.

 

Mark, all the part #'s for the piston lift pump install are in the "Tech facts" section.

 

Thanks Dave. I forgot about that!

I bought two tapped bolts just for the heck or it, but I'm not sure the longer bolt will fit in the back at the transfer pump. Thoughts?

oops! sorry about the hijaak...

 

It'll fit. Just put a plug in the hole.

 

Guess I could plumb a line and have even more fuel to the pump!

 

Think that one all the way through before you try it.

 

Could a faulty lift pump cause a miss in my truck? My trucks turned up a bit and i havent changed lift pumps.

 

It would act like it was starving for fuel, not just have a miss.

 

I cant really describe it almost sounds like a 2cly tractor at idle, then when i give it fuel, its like theres a lack of fuel. I cant decribe it, can anyone diagonis by phone lol.