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Old 12-15-2011, 12:15 PM
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Need help with fuel gauge on chevy truck?

sence I fixed the wires that was causing my fuel pump fuse to blow, my fuel gauge is reading 3/4 fuel at times and drops to 1/4 at times. Before it was stuck at 1/2 full all the time. when i shut of the engine, it will stay were ever it is, even turning the key on want make it move. was wondering whats the correct way to check it both the gauge and the gas sending unit. Thanks for all the help,and advice.

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Old 12-15-2011, 04:37 PM
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Quote:
Originally Posted by robbie43
sence I fixed the wires that was causing my fuel pump fuse to blow, my fuel gauge is reading 3/4 fuel at times and drops to 1/4 at times. Before it was stuck at 1/2 full all the time. when i shut of the engine, it will stay were ever it is, even turning the key on want make it move. was wondering whats the correct way to check it both the gauge and the gas sending unit. Thanks for all the help,and advice.
Same short that kept blowing the fuse for the pump might have shorted a couple of areas in the sending unit or even the gauge itself. I'm betting the sending unit. If it's not on full when you fill it up that's the first thing I would do is get another sending unit. Be sure if you do, the O ring is included, their hard to find out side of a kit or new tank. Sometimes you can re-use them if the come out in good shape and cleaned real well with a coat of Vaseline.
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Old 12-15-2011, 05:32 PM
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Before you go buy a new sending unit......... remove the tank and see if the old one is junked up. You will need the new gasket to reinstall it in the tank etc...... once you get it out you might be able to re-calibrate the arm....... or your wire repair might have cold connections.
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Old 12-16-2011, 08:00 AM
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Originally Posted by EOD Guy
Before you go buy a new sending unit......... remove the tank and see if the old one is junked up. You will need the new gasket to reinstall it in the tank etc...... once you get it out you might be able to re-calibrate the arm....... or your wire repair might have cold connections.
how do i recalibrate it? and all the wires have good connections.
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Old 12-16-2011, 05:21 PM
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After you get it out of the tank, you would move the float/arm throughout it's full range of motion and watch the gauge ...... if you get full movement on the gauge, your sender works and you might be able to bend the arm to indicate a full tank on the gauge. If the gauge doesn't go full range..... it's prob the snding unit.
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Old 12-16-2011, 05:56 PM
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you in tank unit will have 4 wires one grey,that is power to the fuel pump
The purple is the fuel gauge.The other 2 are black and they are both ground.
If you tap into the purple and touch it to ground with the key on, the fuel gauge should go to Empty.If not then the gauge is messed up.If you completly unhook the purple one the gauge will read over the top of full.If not the gauge is mesed up. If the gauge works as described here then the sender is wiped.
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Old 12-17-2011, 11:00 AM
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Quote:
Originally Posted by robbie43
sence I fixed the wires that was causing my fuel pump fuse to blow, my fuel gauge is reading 3/4 fuel at times and drops to 1/4 at times. Before it was stuck at 1/2 full all the time. when i shut of the engine, it will stay were ever it is, even turning the key on want make it move. was wondering whats the correct way to check it both the gauge and the gas sending unit. Thanks for all the help,and advice.
bad ground for the sender is the most likely cause expecially where you had pinched wires.
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