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I'd use a gage and check proper fuel pressure. With intermittent issues, you have to test when problem is ongoing.
Some possibilities, fuel pump--fuel injector leak-- fuel line has a leak.
The usual reasons for intermittent fuel readings are that a wire is loose from the sending unit in the tank or on top of the tank, the connection is not making good contact. If you are getting no reading and it was intermittent or "false" reading at different levels of gas in the tank, the sender unit in the tank is broken. It needs to be replaced.
With intermittent issues, have to do testing when problem is ongoing. If it cranks good but won't start, have a helper crank it while you check for spark at the plugs, if spark everywhere, use a gage and check proper fuel pressure and fuel injector pulse. Any applicable trouble codes?
you need to replace the fuel sending unit in you gas tank, as well as fuel pump. you may find your problems there. unless there is an electrical malfuntion
check the fuel pump fuse/relay, could be just bad enough to cause an intermittent start/no start. and check fuel pressure,spark and the crank position sensor.
i know that if the gas cap is loose then the check engine light will come on. as far as the fuel gauge going up and down the "float" you have in your tank could be getting stuck. This is a pain in the rear to change because you will have to drop the fuel tank and either replace the part connected (best bet) to it or make sure the passage is clear.
I don't know this car, but it could be that an intermittent short in the fuel gage doesn't give enough time for the fuel needle to move, but does effect all the other dials intermittently. Or maybe the instrument panel has a ground wire that is intermittent. Good luck.
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