Fuel cut off switch?
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Fuel cut off switch?
I am in the process off trying to troubleshoot my fuel system problem. At the cutoff switch,I unplugged the switch and I am getting about 6.5 volts on the green wire with yellow stripe. When I plug it back up, I get no power. I also jumped the switch and lost power. Is this normal? Or is a component down the line shorted? Thanks for any help?RICK
Cargo Master
Joined: Feb 2011
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From: Forest lake minnesota
I am in the process off trying to troubleshoot my fuel system problem. At the cutoff switch,I unplugged the switch and I am getting about 6.5 volts on the green wire with yellow stripe. When I plug it back up, I get no power. I also jumped the switch and lost power. Is this normal? Or is a component down the line shorted? Thanks for any help?RICK
Hotshot
Joined: Jan 2004
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From: St Louis
More specifically, it will only have power for about 1-2 seconds at initial power-on, then will not have power again until the PCM detects that the engine has fired.
It is only during that 1-2 second initial priming cycle that a voltage check will be valid.
It is only during that 1-2 second initial priming cycle that a voltage check will be valid.
i ain't rite
Joined: Mar 2005
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From: Marlboro Mental Hospital.
it depends what you are working on. older trucks used a fuse and relay to supply power to the fuel pump, after 04 i believe it was fuel pump power comes from the computer.
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The truck is a 2004 work truck with the 5.4L. I wasn't sure if the fuel pump was powered directly from the PCM thru the fuse box or if it is fed thru the safety switch or what. My main question is how the power is distributed thru this system. If anyone can explain this to me, it would be greatly appreciated.RICK
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mrecker
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Sep 4, 2012 11:22 PM
