http://cgi.ebay.com/ebaymotors/GSL39...em380002868280

ok i was thinking of adding this fuel pump to the stock fuel system so that i can meet the fueling needs of my car once the turbo and motor build are complete. so my questions are.

1. what are the drawbacks of running an additional inline fuel pump?
2. will it add additional stress to the stock in tank pump and regulator?
3. with the additional pump will it add enough flow and psi to support over 450 whp when used with 60lbers?
4. will it even work with the the car having an in tank regulator?

no speculation please

would prefer educated answers with solid reasoning over speculation.

kthnx

jimbo

 

You will have to swap to a return fuel system as the returnless system will be hard to maintain with that pump. The OEM fuel filter has 1 in and 2 out one back to the tank and the other to the engine. You will want to loop it back from the engine instead to make sure the pressure is staying stable under WOT at the fuel rail!

If you can I would just get a larger in tank pump so you don't have to run 2 pumps. The in line pump would be flowing a higher volume and there is the potential that the old in tank pump could prevent sufficient flow.

 

thats close to what i'm looking for, any ideas on whether or not the in tank regulator will limit me if i run a walpro in tank pump?

 

the regulator is only going to allow so much pass thru...im not to sure with our cars but in general it doesnt matter if the reg is 10psi u can try 100 psi thru but the outflow is going to be 10 psi..or a blown regulator lol

 

The regualtor in our cars (my 2.4 for sure) is a spring loaded flapper in the fuel tank.
At Idle the amount of fuel trying to get back with a larger pump will be tremendous.
Possibly more than the OEM setup can handle.

I would get a higher end regulator and turn the system into a full return fuel system!
Its the only safe way to go when making big power.

I now have a full return fuel system on my cobalt.

 

this is the best way to do it...making a "real" fuel system

 

define "real"

 

ok so running an intake fuel pump and running an external fpr will have to do, i'm not ready to go returnless yet financially. i need a bandaid for now.

 

How much HP are you trying to crank out here?

BTW I love that quote in you sig!

 

my favorite quote!

but 400whp is what i'm looking at, i need a fuel system that can safely handle those kind of requirements, but i'm not looking to spend a **** load of money right now.

 

To do it right would cost probably around $450-$600 for all of the parts. Pump, regulator, fuel lines, fittings.

My stock setup is holding up to 300 ish whp alright. I don't think it is safe for a whole lot more.

What are you doing to get that much power?

 

built motor, turbo swap, with saab manifold intake manifold. using the same turbo as paul just installed.

 

Well in all honesty the fuel system is the single most important part of your build!
I would not run it with a less than sufficient setup. If you loose pressure you could go lean without knowing it leading to engine failure!

I would get out the old credit card if need be and do the fuel system properly and completely.

You may be able to get away with just the in tank pump swap and get a fuel pressure gauge to read what is going on so you can make sure its operating as it should.

I just don't know if I would take that chance!

 

by real fuel system that is what i meant...running new lines and new pump with a regulator and all fittings...not patching out system but running a real one

 

Definitely! Although the factory 3/8" supply will be fine to 400whp. You will have to get some stainless steel braided 5/16" line for the return between the engine and the tank!
Maybe talk to hahn about the parts. All that stuff came with my turbo kit!!!

 

so your turbo kit came with a return style fuel system?

 

Pretty much, I am still running the stock fuel pump. But it came with a boost fueler which i have converted into just a static FPR. It came with a long SS braided line to go to the tank, and a shorter one to go between the fuel rail and the FPR. It came with the fittings required to convert it!

Makes it a whole lot easier not trying to guess what parts you will need!

 

i guess i need to contact hahn to see what they can do for me.

 

if it wasnt so expensive i would convert..but 79lb injectors just seems so much easier lol

 

yah but the question is will our pump be able to push enough volume and pressure to make use of those injectors. i know witt is currently working on that right now. personally i think the 60lbers are more than capable with the right setup.

 

The problem is the fuel rail pressure can drop because the pressure is high at the tank, but the high demand up front could drain the line to fast to maintain pressure up front!
= VERY BAD LEAN CONDITION!!!

 

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I doubt it would cost more than $400 to convert leaving the factory fuel pump for now. If you can. You demands are higher than mine.

 

yea but witts running them with no probs so far so will see

 

Those are some BIGGG injectors to not have control of the rail pressure! The last cylinder on the line could have trouble!