Return line or no return line

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Return line or no return line

Post  85bigblockfox on December 18th 2014, 3:18 pm

I put a 302 in a 92 ranger. It has a 600 holley with mech secondarys. The truck was a 2.9 efi. I put a GM tbi electric fuel pump in where the factory pump was for the v6. Made it simple as I didnt have to run new line or mount a external pump. Now my question is the pump is rated at 12-14psi. Can I dead head it at the regulator or does it need a return style with a return to the tank? The motor is a 95 mustang stock 302, ported e7 heads, f4b intake c6. Just a driver.
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Re: Return line or no return line

Post  rmcomprandy on December 18th 2014, 7:50 pm

85bigblockfox wrote:I put a 302 in a 92 ranger. It has a 600 holley with mech secondarys. The truck was a 2.9 efi. I put a GM tbi electric fuel pump in where the factory pump was for the v6. Made it simple as I didnt have to run new line or mount a external pump. Now my question is the pump is rated at 12-14psi. Can I dead head it at the regulator or does it need a return style with a return to the tank? The motor is a 95 mustang stock 302, ported e7 heads, f4b intake c6. Just a driver.
''

This has a lot of other symptoms attached.
Will a "dead head" regulator work...?  YES
However, with that pump, the life expectancy goes way down a bunch as it is always pumping against a high pressure head with very low fuel flow.  Amperage rate goes up and internal heat goes up along with wear rate.
That pump relies on mass fuel flow to cool it, (fuel flows through the electric motor portion), when the electrical current level is considerably higher with a high pressure head and very little fuel flow it greatly decreases the life expectancy. If you were using a by-pass type regulator similar to the throttle body injection regulator for which it was designed, it would last a long time.

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Re: Return line or no return line

Post  4thHorseman on December 23rd 2014, 2:29 pm

I'd definitely run a return. JMO, but I had more vapor lock issues with sh!++y pump gas with a dead headed setup in the summer heat. Return helped 10 fold.
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