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Old 02-22-2012, 03:28 PM   #1
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Fuel Pump issue Ford 460 w/carb

Suddenly the fuel pump is not sending fuel to the carb. Got under with my meter and the ignition key on, got 1.7 v coming out of the feed wires and I have continuity thru the pump.
Any thoughts??
yes there is almost a 1/2 tank of gas and I just installed a new fuel filter
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Old 02-26-2012, 10:12 PM   #2
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Most electric fuel pumps operate on 12volts D.C., so 1.7 volts won't get the job done.

Are you sure that you are not checking the fuel gauge terminals instead of an electric fuel pump? Most if not all fuel gauges use low voltage to reduce a spark hazard inside of the fuel tank. Disconnect those wires from the tank and see if the fuel gauge stops working properly. this should tell you what the wires go to.

I am not familiar with your specific unit, but most gas motors that had carburetors on them used a mechanical fuel pump mounted onto the engine. They started needing electric fuel pumps when they went to fuel injection.

You may have a failed mechanical pump. If so, some good news. They usually cost less to replace than electric ones. Also, if the supply line that feeds the pump has any place that air can get into, the pump will suck air and not pump fuel. Check the fuel filter connections and the line going to the pump, (if it indeed outside of the tank).
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Old 02-27-2012, 11:41 AM   #3
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Sorry, just noticed I responded to another post of yours about this.Check to be sure you don't have a bad oil pressure fuel cutoff switch, or depending on your model year a tripped inertia switch. You can verify if it is the oil pressure switch by jumping across the connections. It is located on the back of the block behind the intake manifold, usually piped with an oil pressure sending unit.

John
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Old 02-27-2012, 01:32 PM   #4
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Quote:
Originally Posted by jmerritt View Post
Sorry, just noticed I responded to another post of yours about this.Check to be sure you don't have a bad oil pressure fuel cutoff switch, or depending on your model year a tripped inertia switch. You can verify if it is the oil pressure switch by jumping across the connections. It is located on the back of the block behind the intake manifold, usually piped with an oil pressure sending unit.

John
It is a bad oil pressure cutoff switch, I jumped as you said the pump ran and so did the motor.
I am having issues finding a switch that has the same plug as the engine pigtail, the opening for the pigtail is shaped like a D with three small prongs inside
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