Question about 2000 Chevrolet Blazer

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Fuel gauge problem not working

Have harness pulled back off of wires thinking a ground problem just trying to make sure when i run a new ground i hook it to the right black reason for asking about wires because in the wiring harness there are three black 2 with a white line down them. 2000 chevy blazer do not want to burn up fuel pump by hooking to the wrong wire has a 4.3 motor pensylvania vehicle prone to ground problems because of rust

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  • 145 Answers

Its more likely the sending unit resistor inside the tank. sometimes you can replace just the float resistor with another working used one but most new ones come only as the complete unit

Posted on May 28, 2010

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Likely, it's the sender unit in the tank. To check wiring and your dash gauge, you can pull apart the connector at the fuel tank, find the wire for the gauge sender unit (its color coded-I dont kinow what the one for your car would be), and on the harness side(the one going to front of vehicle) use a jumper wire and ground that wire to the car frame(get me? you want to ground the wire going to your dash gauge)-with key on, your gauge working properly will move up to half-way or even full. That tells you your dash gauge is working and your wiring to gauge is good. If gauge doesn't move when grounded(double check for a good ground), then your dash gauge may be bad.

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I bought a used car nissan altima 2001.the fuel guage is not working.a roadside mechanic tried fixing it but is stuck.what do i do


Hi,
Usually problem with fuel gauge not working is the gas float sensor inside the fuel tank.
Check first the wiring to make sure the harness going to and from the fuel tank is not disconnected or cut off.
Check the grounding of the fuel float( ground ( - ) ), negative is the one that signals the float to send signal to your fuel gauge. Try to connect a wire in the circular metal base of the float to any expose body ground of your car ( the center terminal if you ground it directly it should move your gauge to "full" ).
Last one is to pull out the fuel float itself and look at the resistor wound, where the float contact is moving, if you have a continuity tester test it.
Finally the gauge, a service technician must handle it to remove the entire panel for removing, checking, and replacing the fuel gauge inside the gauge panel.
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Thanks for using FixYa!

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firat of all check and make sure you have a real good ground or otherwise you will lose current to another wire and this can short out and cause the lights to malfunction.

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This is the wiring code for the 4 wire trailers and
Wire a round seven-pin hitch, typically sold without a wiring harness, to the vehicle observing the following color codes: Run a white 10-gauge wire between ground and terminal one, run the blue 12-gauge wire between the electric brake controller and terminal two, the brown 14-gauge wire between the taillights and terminal three, the black 10-gauge wire between the permanently live 12-volt supply and terminal four, the yellow 14-gauge wire between the left turn/brake light and terminal five, the green 14-gauge wire between the right turn/brake light and terminal six and the purple 14-gauge wire between the backup light and terminal seven (in the center).

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When testing a fuel guage you should disconnect the wires to it,guage should read over full,ground the float wire,turn off key then turn back on should read empty.You have to cycle the key for guage to move.If still inop the wire is broken in the harness between the tank and the dash.Voltage on the float wire is low.When tested with a test light it will barely light the light and pulsate.This test indicates the wiring is good.

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i recently did my chev s10 and they give you a new wire harness that you have to splice the wires and hook them up so it now has the same hook up. those wires are for your gauge as well as your pump. if your sending unit was not hooked up you would not go any where..take it back and demand this gets fixed.

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