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twin 40's, do i need a fuel return pipe?
john_p_b - 5/8/07 at 02:48 PM

well after mucho time messing about i finally the other day got around to fitting my facet fuel pump, all very good but i'm stuck with 1 thing.

on the original ford set up it goes tank to pump, pump to regulator then from the regulator there's 1 line off to the carbs and 1 a return to the tank, simple.

but running with the facet pump and filter king regulator i have no return line? is it a case i don't need a return line now i'm on a electric pump or am i going to have to modify more parts to suit?!

thanks in advance for any help given.


britishtrident - 5/8/07 at 02:51 PM

If you have a fuel pump intended for carbs you don't need either a regulator or a return line.


john_p_b - 5/8/07 at 02:52 PM

it's a facet silvertop pump, but i was told these run at around 7psi and my webers only like around 4psi?


mookaloid - 5/8/07 at 02:55 PM

The flter king regulator can be adjusted to give the correct pressure


john_p_b - 5/8/07 at 02:58 PM

so no return line required then?


flak monkey - 5/8/07 at 02:59 PM

No return needed. Just a regulator for the pump. You should need about 2-3.5psi for webers and plenty of fuel volume!


mookaloid - 5/8/07 at 03:01 PM

My set up is just as you have described yours and it works fine so no you don't need one


caber - 5/8/07 at 04:31 PM

Ditto I have twin 40s Fuel King and a Pacet pump which stops running when the Fuel king closes. All works nicely, just need to set the carbs up and fix the exhaust!

Caber


britishtrident - 5/8/07 at 06:20 PM

Always amazes me why builders have to complicate fuel systems.

Why buy a high pressure pump in the first place.


john_p_b - 6/8/07 at 05:18 PM

the simple answer to the above would be it was cheap


britishtrident - 6/8/07 at 06:16 PM

Main problem with regulators is regulator can only work by shutting off the flow.

Other problem with regulators is they tend not to work in a no flow situation, comming from a marine engineering steam ship background not to trust pressure regulators was hammered into me.

With a sytem with a proper return line it a different matter.

The presure in a fuel line on a carb engine should be determind by the internal spring fitted to the pump.