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Old 07-25-2005, 02:06 PM
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fuel gauge wiring

Hey guys,
I've been trying to wire in my dash gauges, and now i'm onto my fuel gauge. I wired it up like it says in the wiring schematic, with the continuous voltage regulator and everything, but when i turn the key the needle goes from empty to all the way pegged past full. I assumed that this was because the fuel sender wasn't grounded right, but i went back there and there's only one wire coming out of the sender that i can see... and that's the one that i have running up to the gauge. How do i ground the sender with no ground wire, or is it a different problem altogether? Thanks a bunch

frank

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Old 07-25-2005, 03:42 PM
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ground wire

;if the tank unit is installed, the tank should ground the guage -- some tanks have a seperate ground wire running to chassis ground. if the unit is not installed you can use a jumper wire from the guage to ground. or you can remove the guage from the tank and solder a ground wire to the guage flange, then ground the wire.
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Old 07-25-2005, 05:39 PM
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thanks for the reply delivery. the sender is already in, it's just the stock sender i don't know if anyone has replaced it yet, but it must just ground to the tank because i don't see a chassis ground anywhere. Is a bad grounded sender usually what would make the gas gauge peg full like that? If i can't get it to work i'll pull the sender and solder on a wire like you said, thanks for the help!

frank
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Old 07-25-2005, 05:54 PM
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The fuel gage works on the principle of a controlled ground so the wire going to the sending unit is really a grounding wire. The sending unit is a rheostat that is grounded to the sending unit case. You must make sure the sending unit is grounded to the vehicle frame or body. When the tank is empty, the gage circuit is open and does not indicate (Empty or E). As the fuel level rises, more and more current from the gage goes to ground and when full, needle should read "Full or F". If the needle pegs immediately after turning the ignition on, then your sending unit is probably shorted out. Disconnect the wire from the sending unit and run twelve volts to the unit thru a volt meter. If the unit is shorted (fully grounded), your meter will read system voltage. You can remove your sending unit and put an ohm meter on it (one wire on the lead wire pin and one on the unit case) . If it is shorted, the meter will "peg" regardless of the position of the float arm.

Trees
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Old 07-26-2005, 06:46 PM
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fuel guage

do not put 12 volts to the fuel sender, through any meter or other wise. it will destroy the sender.if you decide to drop the gas tank the sender can tested out of the tank with an ohm meter. attach the meter to the sender and the other lead to the body of the sender. depending on the make of the veh, you can read the ohms through the meter.operate the float manually and read the ohms. if it is a GM it will read 3or4 ohms to 90 ohms. if is a ford or other make I'm not sure. this you can find though some research. or maybe someone will write and let you know.
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