what fuel systems do you guys run?? and what size line?

over 500 cid race engine what do you guys do for electric pumps (brands) and what size lines?

Gasoline. Magnafuel 500 pump, -10 feed, -8 on the bypass, -6 to the carbs and n20 fuel. Magnafuel regulators although I will be switching both n20 regs to Holley

^^^ Same..... But not switching to Holley reg's.

(2)Mallory Comp 250, -10 feed, Weldon 4 port, -6 to carbs and nitrous, Mallory reg for nitrous side.

yellowhorse7 wrote:Gasoline. Magnafuel 500 pump, -10 feed, -8 on the bypass, -6 to the carbs and n20 fuel. Magnafuel regulators although I will be switching both n20 regs to Holley

What if you are running 8an for feed and return on a smaller engine would that be ok ?

Aeromotive A2000 pump with -10 line to the reg and -8 to the carb on the motor side, -8 from the pump bypass back to the tank. Holley blue pump with -8 lines to the bypass reg and -6 to the solenoid on the nitrous side, -8 back from bypass reg to the the tank. Both regs are Aeromotive.

Oh, and this is feeding my little 466

whitefield wrote:

yellowhorse7 wrote:Gasoline. Magnafuel 500 pump, -10 feed, -8 on the bypass, -6 to the carbs and n20 fuel. Magnafuel regulators although I will be switching both n20 regs to Holley

What if you are running 8an for feed and return on a smaller engine would that be ok ?

Should be fine on the feed but it really comes down to volume needed for said application. -8 is the minimum for the bypass/return side. I just finished a 68 mustang with a 427w and I used -10 feed but -8 would have been fine. I just did it for growth purposes as the guy wants to now put an F2 on it....

FYI - An undersized return will make it difficult or impossible to get the fuel pressure down. I had a -8 feed and -6 return and could not get the fuel pressure below 10-12 psi.

Magnafuel pump and reg. -10 feed to the reg and -08 return from the pump.

anyone got any pics of there reg and and return set up ???

I have two truck to do the fuel systems on in a couple weeks.. a couple pics would be a lot of help..

My return an feed are both 8an and fuel psi is 7.5 with a mallory pump and regulator. Could this cause a lean condition on top end pull ?

whitefield wrote:My return an feed are both 8an and fuel psi is 7.5 with a mallory pump and regulator. Could this cause a lean condition on top end pull ?

Not likely unless pump is cavitating

547 motor on E85 with Aeromotive 1000 pump #10 lines to Aeromotive regulator #8 return and #6 feeds to both bowls.

racinghabbit wrote:over 500 cid race engine what do you guys do for electric pumps (brands) and what size lines?

Weldon Sportsman pump, -10 from tank to pump, -10 from pump to a Product Engineering regulator, -8 bypass, -6 to carburetor.

-10 from fuel cell to first filter (100 micron) which is mounted directly to pump (Aeromotive A1000), -10 to second filter (10 micron), -10 to bypass four port regulator (Aeromotive 2000), -6's to carbs, and -8 return to the fuel cell which enters from the top of the cell with a hard line inside to the bottom of the cell. I also have a pressure gauge in the return side to keep tabs on that side of the system, stays between .5 to 1 psi .

Doug Rahn wrote:-10 from fuel cell to first filter (100 micron) which is mounted directly to pump (Aeromotive A1000), -10 to second filter (10 micron), -10 to bypass four port regulator (Aeromotive 2000), -6's to carbs, and -8 return to the fuel cell which enters from the top of the cell with a hard line inside to the bottom of the cell. I also have a pressure gauge in the return side to keep tabs on that side of the system, stays between .5 to 1 psi .

It looks like I copied your system except I dont have the return line in the cell. It is needed when the cell is 1/2 empty to stop pulling air in.
Did you have the same problem?

Dave

Dave De wrote:

Doug Rahn wrote:-10 from fuel cell to first filter (100 micron) which is mounted directly to pump (Aeromotive A1000), -10 to second filter (10 micron), -10 to bypass four port regulator (Aeromotive 2000), -6's to carbs, and -8 return to the fuel cell which enters from the top of the cell with a hard line inside to the bottom of the cell. I also have a pressure gauge in the return side to keep tabs on that side of the system, stays between .5 to 1 psi .

It looks like I copied your system except I dont have the return line in the cell. It is needed when the cell is 1/2 empty to stop pulling air in.
Did you have the same problem?

Dave

No! I don't remember where I read it, but there was an article about building up a static charge from pumping fuel in from the top of the fuel cell. The main reason I did it was to keep from aerating the fuel. If you look at factory installations the return line goes to the bottom, at least it did on the factory pumps I have replaced.

Aeromotive A2000, -10 line to pro stock regulator, -8 lines to carb. -8 return from pump to fuel cell. I am going to add a Y - block and a second aeromotive regulator for the nitrous system.

I currently runing a.408 w.too Holley.blues 2 6' s. Gong in to YBlock with 10out to Carb 1000cfm demon.