Weeping lift pump..

[Bluebird]

I noticed a bit of moisture (fuel) on my lift pump :{ . How much life might remain with this pump? Will is cause my injector pump to leak? Does anyone know the Cummins part number? What have any of you folks paid for one? Is it better to change the fuel filter before or after replacing the lift pump? Saw a pump at NAPA built in Turkey I would rather eat turkey than put parts built there under my hood :-laf

Patrick.

 

[JLEONARD]

Pump is probably on it's way out, but it might last a looong time like it is. . maybe forever.

Won't make your inj pump leak. I did a NAPA pump (Carter, last year?) and it was something like $85 maybe. I changed the filter when I was in there since I already had diesel on my hands. . LOL I don't think it matters when you change the filter though.

I have no clue if my pump was built in Turkey, Asia, Brazil, India, but who really knows anyway? It may tell you where it's assembled, but the rest you'll never know. It's a crap shoot.



Jay

 

[Paychk]

The latest Cummins P/N for the transfer pump is 3970880.

 

[TShikoski]

leak in pump

I second Jay's thought about the pump being on its way out. I was coming back from GA last year and spoted a wet spot on the pump just south of Knoxville. Having had this problem before, I also knew that it could last one mile or one year, so I didnt take a chance. Since winter weather was just a few miles up the road, took it to a local Dodge dealer (didnt have my tools with me). Got scalped for $130 something for the pump plus 1. 5 hours labor. Phew it was a hefty charge for something I could have done myself. Go to Napa and buy two (just in case) and get out your wrenches!



Tom

 

[Bluebird]

Leaky L-pump...

Great reply guys, always a good laugh :-laf with outstanding information, thanks for the numbers Oo. This asylum is the best.

Patrick. BTW, truck picture made issue #50 with 200K, the odometer had just turned 200,000. I had the camera ready for this photo-opp .

 

[tugboatphil]

Patrick,



Congrats on making the magazine! Be sure to get your high mileage tag.



I was changing injectors and doing the KDP and some pump stuff up at Smoke House Diesel (Scott's bus garage) last winter. He said we should probably put a new lift pump on at the same time. I got it at the Cummins shop when I got some other parts. It was a very reasonable price (but I can't remember it now). It's a smaller price to pay than having it fail, and then losing the injector pump.



Good luck, "Old Timer!"

 

[Greenleaf]

I picked up a new (OEM) lift pump from Cummins and installed in onto the Silver "B" for a spell. When I pulled it off in favor of the (sexy) piston pump, it too began weeping. That is, untill I installed it onto the other truck. Now it seems content enough it does... ... . :-laf



-S

 

[JLEONARD]

it too began weeping

:{





An pb calls me whacked out??

 

[bgilbert]

Seems like I read in the good book that once you can see it weeping from the outside, its probly leaking fuel into the oil on the inside?? I'd get a new one from Cummins before I would from Napa or anywhere else.

 

[ptmoore]

want to make my truck sexy too, what is the advantage of a piston lift pump and where can i get one. Oo. Oo.

 

[BushWakr - RIP]

If you go to a piston style you'll need to get a cover plate for the OEM mounting hole... just a heads up. .



pb... .



ps: as long as you can maintain 10psi (under WOT) at the inlet to the VE you'll pretty much all the fuel you can use

 

[ptmoore]

pastor bob thanks for the tip about the cover plate. I take it the piston lift is a mechanicly powered pump? any brand preference or locations(sellers) where I can find out more? thanks and you and yall have a good thanksgiving

 

[bgilbert]

Get the piston lift pump from Cummins. 3936320 is the part number. You'll need a few other parts with it for the conversion. You don't need a cover plate, that would be needed if you did away with a mechanical lift pump and went to an electric lift pump. Check out my readers gallery for pics of the install and part numbers needed. Advantage would be a more dependable, rebuildable higher flowing lift pump. For guys that want more power, need more fuel. This supplys the fuel better than a stock diaphragm lift pump, which can not keep up the demand to a modified VE.

 

[ptmoore]

thanks bgilbert, dont know if ill ever bump up the power enough to need a piston pump but it looks like a worthwile upgrade from the stock pump

 

[Greenleaf]

Perhaps PB was refering to the plate you'll have to have to adopt the piston pump to the engine block. It's essentially a spacer. You gotta have that. The piston pump plunger will require it... or you'll make make a mess of the new pump.



-S

 

[Bluebird]

How can you confirm that fuel is in the oil? Just changed the oil 1k miles ago. I over filled 1/2", or 12mm on the dipstick, could that cause any problems? Patrick.

 

[Greenleaf]

Draw an oil sample. It will tell you more about your oil than you'd care to know. NAPA has them, as well as any OTR truck dealership or bulk oil jobber. You'd pay $8 to 18. 00 for one sample bottle.



-S