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Fuel System Problem ?

4hirpm

By 4hirpm,
in Engines & Forced Induction

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9krpm Mentor

9krpm

Posted
Posted

What is the point of having a surge tank if you return the fuel to the main tank?

Is there any good low pressure high flow pump that is ethanol/e85 compatible?

I am thinking of changing my feed pump to something else ready for e85.

SirRacer Experienced

SirRacer

Posted
Posted (edited)
What is the point of having a surge tank if you return the fuel to the main tank?

Is there any good low pressure high flow pump that is ethanol/e85 compatible?

I am thinking of changing my feed pump to something else ready for e85.

I dont know about your reason of thinking, but a surge tank is supposed to be full with fuel to stop any surge when going around corners etc. Provided the lift pump is capable enough to keep the tank full, i cant see why this is a problem. My concern really is that my 044 is highly likely to outflow my stock r32 gtst lift pump.

Quite a number of people have asked me why my return is running back into the surge tank, to which i answer that it is to keep it full. These same guys all suggest to put the feed back into the main tank.

Im running E15 here in NZ. Is using E85 in Australia causing problems with fuel pumps?

Edited by SirRacer
Adriano Grand Master

Adriano

Posted
Posted

Your 044 shouldnt outflow your stock lift pump, as there is no pressure working against the lift pump, if it does, the problem will be worst at idle, as the 044 will flow the most then, due to the low fuel pressure at idle, so it shouldnt be dangerous to test.

9krpm Mentor

9krpm

Posted
Posted
I dont know about your reason of thinking, but a surge tank is supposed to be full with fuel to stop any surge when going around corners etc. Provided the lift pump is capable enough to keep the tank full, i cant see why this is a problem. My concern really is that my 044 is highly likely to outflow my stock r32 gtst lift pump.

My reason is the same as your. I want my surge tank to be full all the time and fill my main tank as low as possible on the track.

Sure the feed pump is capable of keeping up with my 2x 044 and 100% duty cycle 1000cc injectors in a normal situation. However on the track it will suffer surge and only fill up the surge tank during the straight part of the track.

IMHO it defeat the purpose to return the fuel to the main tank and run the risk of surge.

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