Fuel pump question.. May be easier than we think!

[Dntalman]

I have read several posts about the fuel pump boosters with a few people not running one at all. The Phase 1 Roush system does not come with one. The phase II comes with one..

Let's go back in time a little.. I have been a Mustang guy since my first 86 GT.. I read all the Mustang magazines and started my first Mustang with basic bolt-ons.. One bolt on that I did on several Mustangs over the years was the basic installation of taking a stock fuel pump out and replacing it with a bigger pump..

Why can't we just install a bigger fuel pump with more lph than a factory pump? If you install a pump that moves more lph, would that not fix the problem? I know 1,000hp cars need a larger fuel system. But, the street car guys running stock motors with the intention of driving it on interstate trips and beating the occasional Hellcat, Camaro, or Corvette.. Seems instead of a pump booster we would benefit from a bigger pump..

I found this write up.. It seems that fuel pressure is controlled with no adjustment.. My thought is a 500lph pump set a 58lbs of pressure will flow more than a 100lph pump at 58lbs of pressure.. So, again why can we not raise the pump size?
http://www.mustangandfords.com/how-to/engine/m5lp-1304-fuel-pump-flow-test/

Has anyone tried this? Let's talk about this..:cheers:

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[Evolvd]

I don't know the answer as to why we don't have options for replacing the pump but on the subject of LPH and pressure, it's not that simple, see Bernoulli's Principle.

In fluid dynamics for volume to increase pressure must decrease and vice versa. 58lbs of pressure is 58lbs of pressure regardless of pump size if the fuel hose and injectors stay the same diameter. You'll notice in race engines the fuel hoses are pretty large compared to a daily driven stock car.

 

[Dntalman]

I don't know the answer as to why we don't have options for replacing the pump but on the subject of LPH and pressure, it's not that simple, see Bernoulli's Principle.

In fluid dynamics for volume to increase pressure must decrease and vice versa. 58lbs of pressure is 58lbs of pressure regardless of pump size if the fuel hose and injectors stay the same diameter. You'll notice in race engines the fuel hoses are pretty large compared to a daily driven stock car.

The purpose of a boost a pump is to make them flow more fuel.. That is exactly the same as going to a bigger pump.. It has to be the same.

What you said makes since.. If I up the fuel pump without changing the injectors at 58lbs flow will be the same. But, what if you change your injectors..
FUEL PUMP SIZE BELOW IS JUST FOR NUMBER REFERENCE. NOT THE ACTUAL PUMP SIZE IN A MUSTANG
Let's say, we have changed the injectors to the correct size needed for a 900hp car. What I am thinking, if I have a 95lph pump with id1000 injectors at 58lbs of pressure and I am making 900hp... If my car on the Dyno shows that the car is starving for fuel. Can I not just switch my 95lph pump to a 200lph pump.. Run everything the same knowing I have plenty of injector. Would that not fix my fuel starvation problem? It sounds that easy to me..

 

[Travis@boostworks]

As pressure goes up, flow rate goes down.. Fuel pumps are rated at 3 bar pressure. The factory GT pump is already huge. If you wanted to be crafty, figure out a way to tandem two of them using a GT500 basket. Then double the FPDM and you have a plug in solution that wouldn't cost much.

 

[Travis@boostworks]

The pump in the GT flows around 350lph. About 500lph with a BAP at 20 volts.

 

[sonic]

Good info thanks Travis

 

[FATHERFORD]

So would swapping in the "465lph" pump with a boost a pump help?

I know back in the day there was two different 255lph pumps, a "low pressure" and "high pressure." You wanted the "high pressure" as it flowed more LPH at higher pressures. Not sure if that still applies today.

Also, I have done ghetto fuel pump systems strapping an additional pump using clamps to factory single pump hangers, using a Y and connected to the factory fuel system. That was before all these fancy factory dual pump and billet hats were available.

 

[Reds197]

Swapping in the largest pump to fit in the stock basket using the fpdm only gains about 30lph using all stock fuel lines and electronics on the 11-14. The 15 has a bigger outlet on the fuel hat and slightly larger fuel lines so you may pick up more. This is NOT a very good option. A BAP will outflow this easily using the stock pump.

If you add a second pump somehow you need a 2nd fpdm to control it.

 

[Evolvd]

The purpose of a boost a pump is to make them flow more fuel.. That is exactly the same as going to a bigger pump.. It has to be the same.

Sure, if you're running something other than stock injectors. If you're not increasing the outlet size or diameter of the hoses you won't flow more at the same pressure. You have to decrease pressure to increase flow...either bigger injectors or bigger hoses.

Adding a BAP offsets the pressure drop from running the injectors at a higher duty cycle or larger injectors.

 

[Dntalman]

Sure, if you're running something other than stock injectors. If you're not increasing the outlet size or diameter of the hoses you won't flow more at the same pressure. You have to decrease pressure to increase flow...either bigger injectors or bigger hoses.

Adding a BAP offsets the pressure drop from running the injectors at a higher duty cycle or larger injectors.

That is exactly what I thought.. Running id1000 injectors would allow you to change the pump and that would be fine... Unfortunately, by the test Kenne Bell conducted... It's just not that simple.. I am still trying to figure out a way to make it work.. There has to be a easy fix.. I just don't see it..

 

[Travis@boostworks]

There isn't one.. ;)

 

[Dntalman]

What about switching to ecoboost tank.. Are they the same as a GT?

 

[higdominator]

What about switching to ecoboost tank.. Are they the same as a GT?

Same tank, different pump.

 

[daltron]

What about Fore?

http://www.foreinnovations.com/category_s/366.htm

 

[beefcake]

What about Fore?

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