early Ford 4.6 Mod motor fuel line issue


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early Ford 4.6 Mod motor fuel line issue

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slow_sprinter
User

Sep 7, 2008, 7:06 PM

Post #1 of 4 (1429 views)

early Ford 4.6 Mod motor fuel line issue	Sign In

Hey all!

Im trying to plumb up a different fuel tank for a demo car that im building. It is a crown vic with the 4.6 modular motor

My question is, are the two inlets on the fuel rail both a supply and a return? are they both supply?

I know it takes 40-45 lbs of pressure to keep things going and my pump will do that, but when trying to hook everything up, it seems that I just can get the pressure to show on the gauge and I cant get fuel to the motor.

I have spark, and using a noid light i do have signal at the injector, which leads me to this suspected fuel issue
THANKS!!

(This post was edited by slow_sprinter on Sep 7, 2008, 7:07 PM)

way2old
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way2old profile image

Sep 8, 2008, 5:31 PM

Post #2 of 4 (1413 views)

Re: early Ford 4.6 Mod motor fuel line issue	Sign In

Drivers side is supply and passenger side is return.

Being way2old is why I need help from younger minds

slow_sprinter
User

Sep 10, 2008, 7:40 AM

Post #3 of 4 (1403 views)

Re: early Ford 4.6 Mod motor fuel line issue	Sign In

So i do now have my remote boat tank with lines ran up to the fuel rail. I have a brand new pump and 12 volts to it, but I can not build very much pressure. The most I can get on my gauge is 20psi at idle, then when the throttle is pushed the pressure drops out and the car bogs down.

Do I need a restriction on the return side? Since the vehicle is not going to run very long (demo derby), could I plug the return to build enough pressure in the fuel rail?

Is there any way to adjust fuel pressure via a regulator? (I doubt it)

Thanks,
Cale

way2old
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way2old profile image

Sep 10, 2008, 3:50 PM

Post #4 of 4 (1397 views)

Re: early Ford 4.6 Mod motor fuel line issue	Sign In

What pressure will your pump build up to? You actually need a pump that will reach about 80psi and a regulator to drop it down to the operating pressures. If the pump you are using is only good for 25psi, it will not build up any more pressure.

Being way2old is why I need help from younger minds

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