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#88947 03/22/2003 2:17 AM | Joined: Mar 2001 Posts: 279 Shop Shark | | Shop Shark Joined: Mar 2001 Posts: 279 | I'm going to be picking up a '72 GMC 1/2-ton pickup that belonged to my dad. He kept meticulous records from the time he bought it in the early 70's. The fuel gauge quit working on him. He had it in a shop and they replaced the fuel sending unit. He seldom drove it and only put 600 miles on it in a year. After only 600 miles, the fuel gauge quit working again. He took it back and they put in a second new sending unit. It now doesn't work again. I doubt seriously that it is the sending unit, but am wondering if anyone out there has any suggestions as to what to look for. Apparently it worked for a while each time the sending unit was replaced, but not for long. There is a tank switch near the driver's door on the floor and I don't know if the wiring for the sending unit runs to this switch and then on to the gauge. Also, I doubt there is a fuse for this problem, but does anyone know? Anyone have a wiring diagram for a '72 GMC half-ton that might give me some ideas? Possibly a ground wire problem? Any help would be appreciated. I don't have the truck yet, but will be picking it up in the near future. Thanks. | | |
#88948 03/22/2003 2:25 AM | Joined: Jan 2001 Posts: 613 Member | | Member Joined: Jan 2001 Posts: 613 | turn on the ignition.take a wire from the terminal on the sender to the sender ground.if the guage pegs the sender is bad.if the guage doesn't move something else is bad. | | |
#88949 03/22/2003 4:16 AM | Joined: Mar 2001 Posts: 279 Shop Shark | | Shop Shark Joined: Mar 2001 Posts: 279 | Okay. I'll give that a try. As I said, I don't have the truck right now, but will check it out when I get back there. | | |
#88950 03/22/2003 8:53 AM | Joined: Mar 2003 Posts: 6 Member | | Member Joined: Mar 2003 Posts: 6 | Check the connector on the dash pannel. My gauge was acting up and when I reconnected the wires to the gauges the problem went away. | | |
#88951 03/22/2003 10:18 AM | Joined: Feb 2001 Posts: 1,897 Member | | Member Joined: Feb 2001 Posts: 1,897 | Yes, try wiggle/working the plug in the back of the dash as norrcaracer says and try what zenish suggested as well.
Let us know how things go
There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
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Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!
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#88952 03/22/2003 3:39 PM | Joined: Jan 2001 Posts: 198 Member | | Member Joined: Jan 2001 Posts: 198 | One other thing to check is the ground of the sending unit, I have soldered an extra wire to the top of the send unit while i had it out of the tank to connect to a good ground on the frame. | | |
#88953 03/22/2003 7:12 PM | Joined: Mar 2001 Posts: 279 Shop Shark | | Shop Shark Joined: Mar 2001 Posts: 279 | Great suggestions guys. Thanks for the info. I can't help but feel the sending unit is not the culprit. Thanks again. | | |
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