Fuel Pump Return line
Mark Eidson
mark.eidson at tempe.vlsi.com
Tue Aug 27 01:03:28 GMT 1996
It should work but you won't save much since the recommended pump location
is back at the gas tank. I'm in the process of installing a Holley 4DI
system and added a return line next to the source line just to be sure. me
At 03:13 PM 8/26/96 -0500, you wrote:
>>Matthew Lamari <mlamari at origin.ea.com> wrote:
>>
>>I was just thinking of your idea (quite good) for the return line to a pump
>>going to the back of the pump (thus saving further butchery of the fuel tank
>>area.)
>>
>>I was wondering, though, that, in the flow circuit, it is possible for the
>>pump to end up pulling fuel through the regulator. I guess this would
>>depend on the flow resistance between the fork and the tank, and the pump
>>and the return fork.
>>
>>Since it was your idea (don't want to take credit) I was wondering if you
>>could mention it to the group and see if anyone has tried it or shoots it
>>down for some reason.
>>
>>It sounds like a cool way to add such a thing; but I was wondering if it had
>>any hazards I should know about.
>>
>>thanks,
>>Matthew.
>>
>
>Okay, here goes:
>
>On the Holley EFI system (Matt, you could call Holley tech. support
>at 502-781-9741 about this), a return petrol line is required from
>the pressure reg which is located at the TBI. The fuel pump runs
>continuously with the excess fed back to the tank. I understand
>some other systems do this as well.
>
>Matt wanted to avoid installing a return line (I put mine into the
>filler neck). I suggested perhaps putting a tee into the pump intake
>and feeding back to there. Then, if no fuel being used by car,
>the fuel would circulate in loop from pump to TBI back to pump. Only
>fuel drawn from tank would be actual amount used. The way the return line
>system works, the fuel is constantly circulated through the tank,
>its filter sock, and whatever other filters are in line.
>
>Any comments? Any reason why this wouldn't work?
>
>tom cloud
>
>
>
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