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to check it . wire at the fuel tank gauge unplug it the black and purple wire for gauge. put a variable resistor , fuel gauge is rated 0 to 90 ohms. So variate the resistor and see if fuel gauge move. if it does fuel sender have problem or inside tank wire
The pumps at junk yard are sitting and sometimes for long periods of time and the fuel dry up and varinsihes the pump then the pump wont work or leak down after shut off. this job the tank must be dropped i would not want to take a change of doing the work and then the pump is bad, a new one is expensive and times are tough so do what you can i hope this is helpful good luck.
unfortunately it is not the fuse it is the odometer broken internal to the cluster you will need an entirely new instrument panel assemble to remedy the problem, if you purchase one from the wrecking yard and have installed you will be forced to stick with whatever mileage comes on it, if you have a new one installed from the dealer they can program it to match the stored mileage in your origional cluster
if everything works then i would say yes, if there spark then replace computer, just check all your fuses and wiring to ijector,a noid light would be helpful,it plugs into injector plug and it flashes if injector is receiving a signal,there cheap buy one and test if its getting a signal first before replacing computer, if theres no signal(flashing) then replace computer but dont forgwt to check fuses.
The ignition modulator may have to be replaced, you can pick one up at Auto Zone and it's still pretty expensive so you may want to try the Salvage yards. The ignition modulator's are common interchangeable part for the GM line so you can get one from a newer car then your 89 cavalier. Good luck and hope this helps. I believe Auto Zone can also test the ignition modulator too, the modulator is what the coils sit on.
Your dash needs to come out. These bulbs push into a plastic piece that "twists" into the back of the dash board. (About a 1/4 turn) Unless you can get at them from underneath, but I think it's to tight.