Quote:
Originally posted by ElGracho
Good info, but not for an 81-86 truck. GM changed the tank switches in 81 to a momentary type. They moved the gauge contacts from the switch on the dash to the solenoid valve on the right frame rail near the right fuel tank.
There are four wires that go to the harness on the dash. A +12v (pink) from the fuse box, two leads to the tank valve (light green and dark green) and a ground (black).
The valves do fail occasionally. One telltale sign is that it fails in the middle, causes the gauge sending wire to have an open circuit and the gas gauge goes past full scale high.
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Thanks for the info Joe. I've never worked on a 81+ model before so that helps. On the 87 I think they went to fuel pumps in the tanks, (is this right? ) and also what about the fuel switch? Did it just go without or did the switch tell what pump to start pumping and the other to shut off?