EFI plumbing questions

[relaxinrob]

When I put on my Kenne Bell supercharger, I am also upgrading my fuel delivery system as well as many other things. I currently have the plumbing from an '87 mustang. I will be using an Aeromotive 1000 series fuel pump and the Aeromotive regulator with AN fittings and steel-braided lines.

I saw a diagram of a system and wanted to verify that this is how I should plumb my system. It flows as follows:

From the fuel cell to the pump, to the filter, to the front of a fuel rail, from the back of that fuel rail to the back of the other fuel rail, then from the front of that fuel rail, then to the regulator, then to the return line back to the tank.

Is this the "normal" plumbing for an upgraded fuel system?

Any help from someone in the know is appreciated.

Thanks,

Rob

[DonC]

Rob:
Try this web page: http://www.verycoolparts.com/programming.htm
Scroll down to the bottom of the page and there are 3 different diagrams of fuel system routings.
DonC

[PSB]

Best way to maintain equal pressure in both rails is to have a Y-block in the feed line before the rails. The Y-block is a good place to put a fuel pressure gauge also. Run one line to the back of each rail. Return lines from the front of each rail to the fuel pressure regulator, then the return line from the FPR back to the tank.



Pete

[Dagnar]

Concur with PSB on this one.

The only diagram on VeryCoolParts that's sort of acceptable is "C" because A and B have dead ends on the fuel rails.

Dead ends on the fuel rails can cause problems with heat soak vapor. If the fuel boils in the rails the vapor has nowhere to go except out the injector which can cause backfire that damages butterfly's. With a return at the ends of the fuel rails the vapor can be released back to the tank.

Diagram "C" is not optimal either because it runs all 8 injectors in series. So if there is a slight fuel shortage the last injector will receive less flow. Running 2 banks of 4 injectors each in parallel means the last injector is only 4th in line, less chance of starvation.

So pump- filter- Y fitting- one line to each bank- one line from each bank going to pressure relief valve- back to tank.

Kinsler has some good information, I believe you can access their catalog in PDF format online. Page 71 of their catalog has EFI plumbing diagrams.

www.kinsler.com

[RICK LAKE]

Rob Make sure that your supply lines are 1/2". The pickup or pickups in your tank you didnot say. If you are running a sump setup keep a 1/2 tank of gas in the car, on a long sweeper the G force may have your pump sucking air. Same with hard braking and turning. The way I run mine is with two Y's.Supply goes in the front of both rails, comes out the back, goes into the fuel pressure regulator and back the return line, 3/8". Some people like to use two pressure regulators if running high pressure and 96 lbs injectors. TOO MUCH FUEL to the motor will never hurt anything. Lean condition under boost will melt pistons. Stay rich and fat on the setup 11.8-12.2 A/F if racing. 12.4- 12.8a/f on the street. Watch the good air nights. Rick Lake