Depending on the vehicle and vintage you will usually have two. One going to the sender the other will be a ground. That ground can be used with other funtions .
SOURCE: fuel gauge
there is a sending unit in the tank this has probably clogged or wore out it has a filter on it, with gas debries this will make your guages stop working correctly
replace sending unit by dropping tank with gas out of tank and then pull out sending unit replace with new one
SOURCE: fuel gauges no working 1989 ford f-150
drop the gas tank and either replace the fuel sending unit connected to the fuel pump, or you can try to clean the contacts w/ a pencil eraser, just be gentle
SOURCE: fuel gauge and speedometer not working
Check the speedo cable. It runs from the transmission to the driver-side firewall. Check the fuse-box for the fuel-gauge fuse.
SOURCE: How to test fuel gauge in dash 89 chev 2500
To test the gauge,unplug the connector at the tank,the fuel gauge will go to full,then ground the wire to the fuel gauge,and the gauge should go to empty,I use a test light for grounding the circuit,to keep from grounding the wrong connector,when doing so,the test light will glow dim,and the gauge will go to empty slow.
Testimonial: "Great advice. The tip about using a test light was above and beyond."
SOURCE: Gas tank will not switch and gas runs out of fuel
Hello tlsnyder52: My name is Roger and I will help you. The problem you have is in the fuel select valve. This was a factory recall a few years ago. The recall number is 91S39.What happens is the valve sticks when you switched tanks. This returns all unburnt fuel to the tank you are not using. Basically fills the other tank while the one you are using goes empty. When you fill both tanks the returned fuel has nowhere to go. The fuel has to go somewhere and pushes out the vent. This is not a hard valve to replace. But I would check as if the recall was not performed it may be under warranty recall. The service kit number is F1UZ9B263B and can be obtained from a Ford dealer. Should You need further help please just ask. Please rate the answer. Thank You for using Fix Ya. Roger
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