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Old 07-30-2010, 10:35 PM   #8 (permalink)
fordem
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What needs to be determined here is what sort of pump is being used, and what the manufacturer of that pump recommends.

I've been using electric fuel pumps for over two decades, and that includes installing them on cars that originally had mechanical fuel pumps, and not all of them require return lines.

Some of them (notably SU pumps as fitted to the classic Minis) also tick during normal operation, others don't, it depends on the design.

Also, whether or not you need a fuel pressure regulator will also depend on how much pressure your particular pump can deliver and how much the carburettor needs - if a return is required with your particular pump, where it connects will depend on the regulator.

Just as an example, one of my Suzukis is carburetted, has a low pressure, high volume, "in tank" pump, has no fuel pressure regulator and has a return line - tee'd in to the delivery line just before the connection to the carb - and this, by the way, is the factory setup - the only things that have been changed are the fuel filter (located outside the tank, after the pump by the way) and several small diameter rubber hoses.

Last edited by fordem; 07-30-2010 at 10:38 PM.
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