electric fuel pump pressure

8184 Views 7 Replies 5 Participants Last post by Sedrick, 13 d ago

megadesertdiesel

Discussion Starter · Aug 28, 2007

i recently installed the Autozone electric fuel pump and a glass fuel filter. i tied the pump into the tee and have a return line, but i did not install a regulator. i have ran it around the hood for 20 miles or so and have not had any problems.

do i need a regulator or just slow down the return line with a fitting? or just leave it alone

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perfm

· #2 · Aug 28, 2007

What is the PSI on the pump?

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megadesertdiesel

Discussion Starter · #3 · Aug 28, 2007

1.5 to 4psi

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SteveS

· #4 · Aug 28, 2007

megadesertdiesel said:
........do i need a regulator or just slow down the return line with a fitting? or just leave it alone..........

The Y fitting serves as Yamaha's cheap and dirty pressure regulator. Any extra flow is sent back to the tank, keeping the pressure at the carburetor quite low. Their idea was to simulate an overhead gravity fed fuel tank, as this is what the carburetor was intended to work with. You can get into trouble if the return leg of the fitting is aimed downhill, as the fuel passing by the carb feed leg can actually siphon fuel out of that leg, leaving you with a negative fuel pressure. When setting up the Y fitting, make sure that the tank return leg is pointed uphill, with a generous loop of hose going upward before it runs to the tank. This will give it a bit of extra altitude for a bit more effective pressure.

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Mr. Off-Road

· #5 · Aug 28, 2007

dang... that is one CLEAN motor... does it ever see off-road?

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megadesertdiesel

Discussion Starter · #6 · Aug 28, 2007

thanks for the help guys. so i think i am ok, and dont need a regulator.

dang... that is one CLEAN motor... does it ever see off-road?

50 hours and 677 miles of hard dunes miles and a little desert. but mostly a pressure washer after every trip.

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Sedrick

· #7 · 13 d ago

SteveS said:
The Y fitting serves as Yamaha's cheap and dirty pressure regulator. Any extra flow is sent back to the tank, keeping the pressure at the carburetor quite low. Their idea was to simulate an overhead gravity fed fuel tank, as this is what the carburetor was intended to work with. You can get into trouble if the return leg of the fitting is aimed downhill, as the fuel passing by the carb feed leg can actually siphon fuel out of that leg, leaving you with a negative fuel pressure. When setting up the Y fitting, make sure that the tank return leg is pointed uphill, with a generous loop of hose going upward before it runs to the tank. This will give it a bit of extra altitude for a bit more effective pressure.

Thanks a bunch I believe that's why I can't go full throttle. It bogs down and just today found out my fuel pump died.

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Sedrick

· #8 · 13 d ago

Thanks a bunch I believe that's why I can't go full throttle. It bogs down and just today found out my fuel pump died.

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