lowwag64

Hi Guys,I have been getting great advice for "teching" my turbo noise,but I have another question.
Why again is a 2nd gen. LP better besides more HP.Do I need to adjust my IP if I install one?

Ilikebikes

The piston pump style would really only help if you're running a decent amount of fuel. It will supply the pump with more fuel than a stocker. On a stock truck with a working, diaphragm style pump, it will not up the horsepower. No pump adjustments are required if you install it.

Ilikebikes

I forgot to mention that you DO NOT want a stock, 2nd gen style pump. These pumps make too much pressure for the VE and will blow out the front pump seal. You want the low pressure piston pump. I don't have the part number right now, but it is somewhere here on the forum.

MikeThomas

I think there is a post in the sticky with the part number. Bgilbert may know off hand because he got me mine. The only con is the price compared to a stocker.

Cowboy_Customs

The upside to the Piston lift pump, is its fueling ability, and reliability. Fromwhat ive gathered is its more reliable the our diaphram style, and should the "mopower" bug bite, it'll flow enough fuel to feed the fire.

The con really is the price, its upward of 200 bucks. But Sheid is listing a second gen "fuel pump" for 98 bucks, so they may be "THE" source for them for now on.

Heres the part number for the low psi pump as lited by BGilbert in another thread: 3936320

Bob Beauchaine

The piston style lift pump is rebuildable. It's made by Carter. As my RWHP came up I knew I was going to need enough fuel to keep my VE supplied. I did not want a weak link in my fuel system.

Bob

rbrettctd

At what point should one install it? Ive got pods, fuel pin, 3 turns on full power screw I think. After I get a turbo on, Im goin more fuel probably. Think Itll benefit me to start hunting one soon?

Boatnik

I decided to install a piston pump when I saw my fuel pressure drop below 3 pounds at wot. It now will not drop below seven, which is where the diaphram pump starts. In the sticky therre are part numbers for everything you need and instructions on how to do the mod. These are very good instructions and made the job go well.
As for when you should? It is a good upgrade when done correctly.
I would do it when you go to bigger injectors or before.
The piston pump you want doesn't come off a second gen truck. It is for an industrial use diesel and has a lower set point of 15 psi instead of the seal blowing 30 psi.

rbrettctd

So I should do it with what I have, or when I get bigger injectors than pods? THanks. And where do you get the pump?

Fergavs

Ya I would add it as one of my next few mods. Some guys have found they have been running basically dead original LP without even knowing it. Its never a bad thing to have a solid supply of fuel to your injection pump. Low fuel supply kills injection pumps so the $200 bucks for a lift pump beats $1500 for an injection pump!

dpuckett

With stock injectors, and 160cc of fuel, I could suck my diaphragm pump down to 3psi on a WOT run in 4th and 5th gears. I wont even mention my marine injectors.....

Daniel

bmoeller

I replaced the lift pump on my '97 a few years ago. C-IH dealer had the same pump for less than $100, including the 2 gaskets. I only had to swap out one of the fitting between the 2. Piece of cake.

Lift Pump: J936317
Gasket: J939258 (two required)