There is a float in the gas tank that sends a signal to the gauge. It is either stuck in the up position or no longer is sending the proper signal. Probably needs to be replaced.
SOURCE: Fuel guage stays on full
the problem is the fuel gauge sending unit is an open circuit, this is caused by the sender and it will need to be replaced, use caution when removing the gas tank, also try to have the tank at less than 1/4 full, above all be careful, there is a signifigant fire/explosion hazard when doing this job.
SOURCE: fuel guage stays on full
There is a possibility that the float on your fuel pump may be sticking. that could cause your gauge to stick way up top or way down low.
SOURCE: 1984 toyota pickup, 2wd, standard
On this truck there are two things that make the fuel pump run..
1. turn the key to the start position.
2. The airflow meter shows that there is airflow going to the engine.
My guess is that when you turn the key to start the pump runs and the truck starts.. when you release the key the airflow meter (Mass airflow sensor) is not telling the system that the truck is in fact running and the fuel pump shuts off. I would look for a new MAS in a junkyard and see if thats your problem. You can test this by supplying power to the fuel pump manually. (jump the relay or something similar) and see if it runs.
SOURCE: 1984 toyota pickup 22re fuel injection is not getting fuel to the cylinders
Most likely a fuel pump problem, locate the diagnostic check connector under the hood and turn the key on then put a jumper wire between the terminals FP and B+ if it start then the fuel pump is ok and the problem may be the EFI relay or efi fuse
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