d16forlife

Ive had this In my head for quite a while now so bare with me.

I know some of you are running higher flow fuel pumps.How is that efficient with the stock fuel lines.Yes thet new pump can flow more but all its really doing is creating more pressure since you are trying to push more fuel through fuel lines that were designed to be efficient with a smaller pump.Why do I say this.Well becouse unless you change out the stock fuel lines you would still be getting the same amount of volume of gas but with higher pressure.The pressure would be higher but it seems like it would drop off at wide open throttle and at high boost(10-15 or so psi).In theory the fuel lines would restrict all that volume that the pump is trying to get to the fuel rail and it would just turn the volume into pressure wich would starve the engine.
Am I just making too much of this or do anny of you see my point?

Special FX

I guess it really depends on what you need to do. My stock lines flow a ton of fuel, as long as you don't try to get the pressure too high. A vane type fuel pump, which basically all of us have, is positive displacement and like almost any pump, flows the greatest volume while producing the least pressure. I have run with stock fuel pressure, stock pump, stock lines and at 14 psi I could tune so rich it would crap fire out the exhaust.

d16forlife

So it really wouldnt matter unless you are running mad amounts of boost right?

That was my point .If you have a lot of pressure on a pump it will just heat up more and eventually die prematureley.Pumps dont like to be restricted so I was just curiouse how that worked out for you guys running that setup.

88crxSi

larger pumps are required when you need more fuel. So the fuel will be emptied quicker out the fuel injectors. I have this great theory. let me 'try' to put it into words..

you will get excess pressure with a high flow pump on stock lines and stock INJECTORS running stock TUNING. But once you actually REQUIRE the extra flow of that pump you should have already needed to have larger injectors installed to use up that fuel more quickly. A delicate balance I would say.