Changed the fuel pump, but it's still not working. i checked the fuel pump relay, and the fuse in the fuse box all checked out as good, when cranking the engine over a notice the temp gauge was jump the end of the guage. it never done that before. think it maybe a short, or could it be the oil pressure sensor?
Fuel gauge the tank sender is like a resister, no resistance to ground gauge goes up, i think you have a grounding fault in the earth wire, you will need to trace were the wire goes to or make a new feed, making a new earth feed can sometimes be better if you have a spare bulb and some wire to attach to it connect one wire to the live feed on the pump and then ground the earth wire on the shell if it lights up then its the ground that's at fault.
SOURCE: feul temp oil pressure gauge not working
this problem sounds like a bad ground to your gauges first check your fuses with a test light take the end of light ground on battery with a long wire with alligator clip on end so you can reach around to test second thing take probe tip touch pos of battery to make sure tester lights then test all fuses first both sides most fuses have two little holes one on each side on top to put probe on fuses should light up on both sides some fuses wont light on both unless the ignition is turned to acce or for instant a headlight switch has to be on to test fuse if fuses check out okay you will have to get into the gauge instrument cluster possible if these gauges are pushed into a pin type or flat circuit board its possible loose scews and a good bump would make a bad contact in the cluster
SOURCE: Buick Regal dying
You have a problem in the fuel pump relay circuit for sure then. I'm betting the relay, but it could be that dropping resistor.
SOURCE: 1987 chevy s10 2.5l tbi will not start. changed
That eliminates the crankshaft and camshaft position sensors. Have you checked the fuel injector itself for an open winding or stuck valve plunger? There should not be a steady 12 volts to the injector--if good injector, it would be spraying fuel steadily into the throttle body. But at least the engine should try to run if poorly. Take the injector out, dry it off with air, and intermittently apply 12 volts to one terminal while grounding the other. You should hear a click from inside every time you touch 12 volts. If not, replace it. If it does, it may be plugged with debris. Try blowing through it in reverse with compressed air.
SOURCE: 1987 chevy S10 engine idle problem
relace the throtle air idle valve.The temp switch will allso cause this problem.
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