I have a 1997 GMC jimmy 314,000KM on it. the fuel gage jumps around and stalls out, when i hit the brakes or turn signles or some times just out of the blue. and when you turn the key into the on postion the gage jumps to the max of full then you can hear everything kick in within 1 to 5 secs like fuses clicking and daytime running lights will then come on thats when you can start it, if you try and start it when the gage is jumped to the max it wont start will just keep turning over. i thought maybe a ground problem but i think the volt gage would move around then but it dont. need help
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As far as your gages and door locks, Any component that gets feed from ignition switch, I'd have to check feed to and from ignition switch when the problem is ongoing. I haven't looked at your wiring diagram, yet. Also, you may be able to check voltage at applicable fuse circuit, when problem is ongoing.
Sounds like the float on the sending unit got stuck. This is a backyard tactic but... Try hitting the bottom of the gas tank with a hammer and see if it frees it up. Don't go and beat the hell out of it. A few decent whacks and it should come free. If not you'll need to have the fuel pump/sending unit replaced.
I had a problem just like that and what it was is that there is a fuel pick up on the fuel pump inside the gas tank. This came off the pump at some point and when it did the engine would stall out when ever I turned left or when I was on the breaks coming to a stop light, and this only happened if I had less than about 6 gallons of gas. I removed the tank and pulled out the pump and found the problem, I replaced it and have not had a problem since. Just to let you know the car was a 1992 Acura Vigor, but it sound like the same problem. I hope this helps.