well im not sure what to do with the ol' fuel system

um im going to be using the factory injection manifold for a turbo a15 setup, and im not sure what is required for the fuel system

i have a fuel pump off an injected car (volvo of some sort) so i pressume thats a good start, but do i need to use a surge tank or anything like that???, does a fuel injection style pump usually require a high volume pump to feed it?

the injection manifold had an in and return line on it already, another club member is gonna help me out with a larger diametter fuel pump to feed it and i was thinking of using the original for the return line, i guess if i dont use a surge tank i will plumb it into the filler neck (or maybe get tank modified as i prob should put a larger outlet on it anyway)

oh and i now have a spare 14psi holley black pump (used for 1 week around the block a few times only), its the same as the popular holley blue pump except that it has a higher flow rate, anyone interested if i dont need it?

original fuel line used a s return line may create back pressure in the fuel system.
idealy same size in an dsame size out would be ideal.

would the back pressure be a concern, i cant really picture it being an issue, but i dont really know?

after talking to demo i think ill use a surge tank, do i need to be carefull of the pump specs that i use to feed the surge tank?

reason for usin a surge is just to be sure but also it seems like a good idea to run the return into it

my main concern really is that i need to feed the high pressure pump with a high volume pump as it will be impossible to mount the high pressure one below the tank (on a coupe) so that it is gravity fed

Use your holley black to pump fuel from the tank to the surge tank then the high pressure pump from the surge tank to the fuel injector rail. For the fuel return you can either run it to the tank or the surge tank. Specs for the high volume pump are that it is able to flow more fuel than you require.

yeah but same prob with holley black, it needs a good feed, and i cant mount it lower than the tank, if it sucks air the holley will stop feeding

hmmm what to do!

on my 1000 I modified the tank so it has an inbuilt surge tank. But the tank is located differently to your coupe.

I am thinking that your tank is like a 120y wagons where anything lower than the drain plug is to low.On my friends wagon we put a pickup in the top side of the tank that went down inside to the bottom, its never given problems but it is open to the possible problems like you would face if you just ran fuel line to your pump.
The only way I can think at this point in time is to always keep the tank atleast one quarter full and you shouldn't ever have a problem

yeah i dont think there is a cheap way out, i think ill run a 5psi elec pump in the boot, feeding a surge tank, then run the high pressure from that, and feed the return back to the surge,

demo said he used an overflow on the surge back into the tank, but from what u said i think it may not be neccesary, is it necessary or not?

and do you think i need to increase the size of the outlet on the tank if i am using a surge tank

hehe hard questions, sorry

The surge tank should always have an overflow back to the tank, if you don't do this, when the surge tank is full the injectors will still be supplied to much pressure and the car will run rich. Really if the high flow pump is good enough for the job there is no reason to supply the surge tank with the return line. ( Meaning there is no advantage but there is also no loss if it is done)

The tanks outlet should be the same as ( no smaller) than the high flow pumps inlet.

cool thanks, looks like a bigger job than i thought