How many GPH? I see alot of people running the Holley Blue pump. Is this the one to get?

 

Holley blue pumps are great. I have one in my 81 chevy truck with built 355 running low 13's in the quarter mile. I believe you would put this between the tank and the lift pump, and just upgrade to a piston pump while your there. This will not make the lift pump work as hard and will have a constant steady fuel supply. i know wannadiesel has one and i believe a few others have them too.

 

A 93 has a lift pump operated by the camshaft.
What are you wanting to do?
Don't even entertain the thought that an electric pump is better!!!!

 

The only benefit of an electric pump is that you don't have to manually prime the air out of the fuel lines after you change the fuel filter.

Read up on the piston pump. It'll cost about $200 to switch over, but that should be the last time you buy a lift pump.

 

No Holley Blue on my truck, I have a Walbro 392. According to the flow curve it's pumping about 65 GPH at the pressure I'm running. It's sold as a 255 lph pump.

If you want good fuel pressure at the VE, you need a high volume, high pressure pump and you need to regulate it with a bypass regulator AFTER the fuel filter(s). A Holley Blue fulfills none of these conditions.

 

Where Do You Get A Pistoin Pump For A 1st Gen Dodge And What Is Involved In Changing Over

 

There's a writeup in the stickies at the top of the forum. Parts are all available from Cummins.

 

So, your Walbro is the way to go then? The Holley Blue's run about 110 GPH and about 14-15 psi. I have seen several guys run these on sled trucks, that is why I was wondering. What is the pressure on the Walbro?

 

The walbro's are rated for up to ~65psi I believe, obviously as the pressure rises the gph goes down. On your holley is the 110 gph at 14psi or is that free flow?

What pump is going to last longer

1. designed to operate at 65+psi but actually operating at 20-psi?

or

2. designed to operate at 14psi and operating at 14psi?

i'll take option 1.

 

I was just told the Holley is supposed to be 110gph @14psi free flow and 88gph @9psi. I just talked to guy who is running a Holley and he says he likes it. I am just wondering what I should run.

Wannadiesel, are you running the Walbro instead of a mechanical LP?

 

You can't have 14psi free flow, its like an oxymoron or something. You can have 14psi or you can have fee flow, well atmospheric pressure, but the pressure on the inlet side of the pump will be the same as the outlet, so there is no pressure differential, unless you have some head pressure but that is probably pretty small so we'll neglect that.

Wannadiesel has both mechanical and electric, but not in series, in parallel.

 

Sorry I mis-typed. Guess I should have payed more attention to my typing and not you last post. I did not mean to type 14psi in there. They are 110gph free flow.

 

So what I'm reading guys are having an electric pump, pick up from tank and supply to the mechanical pump? And if thats the case then do you have the bypass reg before of after the the mechanical pump? And also if you are supplying the pressure to the mechanical pump then is it nesseasry to change over to the p pump lift pump, or will the stock lift pump work, if using the electric supply pump?
Jusitn

 

No you don't really want to feed one pump with another pump, especially if you have the stock diaphram lift pump.

I you really want an electric lift pump than this is what you would want to do:

https://www.dieseltruckresource.com/...el+pump+bypass

But really a piston LP is probably the best option for reliability and flow. Unless you're shooting for some big HP with a 14mm HR.

 

Well what I'm looking at doing is a hefty fuel system for a pulling truck. I may not even go this route, I just want to know what people are actually doing for heavy fuel flow. The truck is getting probably one large charger (HX50 for now because I have it), and I don't know I may even go with a P-Pump.