fuel pump questions

[Caveman]

ok..so i started buying a bunch of fuel related parts for the bird..but i got a few questions im not too sure about...

I have an aeromotive a1000 fuel pump, reading through the instructions it suggests a gravity feed..pump lower than the tank.. my fittings are welded into the top of the tank...will this be a problem? i figured it would still work properly because of the line that goes down into the tank but im starting to second guess my self now...
also..it recomends a 10an line..but the fittings on my tank are 8an..i was thinking run a 8an-10an adapter and 10an line to the fuel pump and on up to the engine bay...would that 8an-10an change cause some kind of pressure issue or no? maybe cut and drill that fitting out and weld in a 10an?
and finaly..recomends an equal pressure system...ie 10an line, y-block into 8an and one into each fuel rail, one 8an out of the front of each fuel rail and into a regulator, and finaly a 8an line back to the tank.... does this sound about right? ive never made my own complete fuel system before so im kinda in new territory, any pointers would be greatly appreciated, thanks! Caveman

[meissen]

Yikes - not familiar with that heavy duty of a set up but I'll definitely bump this up for you in hopes someone knows. I just did a little racetronix 255 pump but it sounds like yours must be feeding a thirsty engine!

[sman]

Doing a 8 to 10 gets you nothing. The fuel can only flow as fast as lowest value. Ie if the 8an line flows 50 and the 10an line flows 75, it will only flow at 50, because the 50 is feeding the 75. Also, I dont see why you would need to y and split for each bank of cylenders, into 1, crossover connects them, out of the other.

I am by no means a fuel system pro, but I dont see why you would need to.

[DETROITMUSCLE]

if he runs aftermarket rails, which I expect he will, then he will need a y-block and a regulator as well. I think you can usually buy them as one unit.

[c0ncEpT]

Everyone I have heard of that uses an A1000 has a sumpped tank so there could be an issue with the lines being at the top who knows.

If your running a single inline pump I dont see why you would Y the line and run one to each rail. I would run a single line to the back(or front depending on how you want it to look) off the pass side rail with a crossover in the front and run a single line back to the tank as a return.

[sman]

If your running a single inline pump I dont see why you would Y the line and run one to each rail. I would run a single line to the back(or front depending on how you want it to look) off the pass side rail with a crossover in the front and run a single line back to the tank as a return.

Thats what I was trying to say.

[1BADAIR]

they want them y into the rail then y'ed -into a 2 port (or more) regulator after the rails normally.
they say fuel pressure is more consistant that way.
the inlet size of the pump is normally more than a recommendation. If you run a -8 inlet on a pump that requires a -10 you will burn the pump
you could run -10 to the prefilter and pump then -8 after the post filter.
the pump being higher will cause vapor lock and dry starts
the metal tanks are easy to sump
the other thing with pumps that are big for you HP level is the return line. You will probably want a -8 return for yours. A -6 may be too small for the amount of fuel you will be returning

[Caveman]

Doing a 8 to 10 gets you nothing. The fuel can only flow as fast as lowest value. Ie if the 8an line flows 50 and the 10an line flows 75, it will only flow at 50, because the 50 is feeding the 75. Also, I dont see why you would need to y and split for each bank of cylenders, into 1, crossover connects them, out of the other.

I am by no means a fuel system pro, but I dont see why you would need to.

yeah i figured as much..its not a big deal, hack off the tank fitting and weld a 10an fitting in there...problem solved, i was just curious about that. as also as far as the fuel rails, aeromotive strongly recoments i run an equal pressure system such as what i stated earlier.. the whole goal of that is obviously to keep pressures the same in both fuel rails, instead of dropping slighty after it passes each one of the 8 injectors in a row.. again this is just what aeromotive suggests..thats why im tryin to get ideas from you guys..

[Caveman]

oh and i forgot 1badair.. i was planning so far to do the 10an all the way up to the y block...8 an to each rail and 8an return, im good on that..

[Caveman]

as far as vapor lock or other issues i might have from the pumps location... aeromotive says its fully submersible...soo....have any of you guys done something like that with an a1000? personaly im a little worried about wiring up a fuel pump and dropping in my tank and only to find out then its not so submersible... but anyways...that should get rid of any gravity feed issues....right?