Engine/Transmission (1994 - 1998) Do 12V's need lift pump help too?

[EGILLILAND]

Just curious. Looking for anyone's thoughts on what performance levels (for the 12V motors) begin to exceed our stock lift pump's capabilities.



I ran my truck out of fuel last summer, while pushing it real hard. When I got to the next fuel stop, doing some calculations, knowing I've got a 35 gallon tank, there appeared to be about 6 gallons of fuel unaccounted for.



My next truck money is going to get used on a new fuel sender and a larger transfer flow tank. I figure if I'm dropping the tank to fix the sender I may as well put in a bigger tank... . should I look into also adding a pusher pump as long as I'm tearing into the fuel system?



Let the meeting begin,



Cheers all,



Gill

 

[HoleshotHolset]

Gill:



The lift pump on your truck is good for about 500hp or so... once you get past that point, you'll need to augment it.



It wouldn't hurt to swap it out if it has a lot of miles on it... but there's no reason to upgrade it unless you're beyond 500hp.



Matt

 

[chrleb1]

They really don't need that much help. The reason why the 24v lift pumps need help is because they are already getting beat up by the diesel and making it harder to suck just tears it up even more. 12v lift pumps don't really have that problem unless it has been a crazy amount of miles and things are getting past the screen.

 

[Jim Fulmer]

Here is some data for you as you can see my power numbers, my stock system run at 33 psi at cruise and I can almost drain the pressure to nothing, but with the Haisley's system on it's at 50 psi and drops down to the low 30's under hard acceleration... ..... just watch what happens to the pressure when your testing.



Jim