Question about Chevrolet Caprice
If relay worked when placed in another vehicle you must have a wiring problem. trace wires from fuse block to relay checking for corrosion or short.
Posted on Jan 13, 2013
So the relay does have power to it? Try this: pull off the connector at the fuel pump, find the pump wire, and check if it has power when the car is being cranked over. If you have power then, it may be the fuel pump ground that is lost. Find the ground for it and check it-some have a ground on top of tank, some are close by, and some are routed back into the wire harness for a more remote ground. If it's in the wire harness, simply move negative lead of voltmeter to the ground terminal, and positive lead on the pump wire: crank engine, if the voltmeter registers voltage, ground is good. If pump is getting power, but voltmeter shows nothing when negative lead is on the ground terminal, then the ground is lost.
If no power to the pump, the relay may not be getting a signal from the computer to turn it on. One way to check is to pull the relay out, and check for a signal to relay terminal when the car is cranked. Then you would have two terminals showing power, the pump feed terminal, and now the signal from computer. If no signal, check the wire from computer to relay. If you find that signal, the relay may have a bad ground: the coil side of relay has the signal from computer to energize relay, and the other relay terminal from coil side of relay is to ground.
Posted on Jan 13, 2013
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Posted on Jan 02, 2017
SOURCE: fuel pump 2000 chevy blazer
Check your connections. did you run the fuel pump wiring under the drivers side door sash like GM did?.. if so check for nicks in the wire or bending or cracks.. this happens.. happened to me. check your fuel pressure. 40 dollar part at an auto store. If its below 59 PSI it wont work. And blazers are very intolerable to low fuel pressure. Also try taking the negative post off your battery for a little while and then putting it back on and if you can get it started again drive around (if its safe and running decent) for at least 30 minutes to get your car computer system acclimated to a new functioning part. Did you check the fuel filter?. rule of thumb when a pump goes change the filter its always the last thing people expect because we all jump to catastrophic engine failure at the first no start moment. lol.
Make sure that all your ducks are in get my drift.. Air oxygen fuel thats the mixture you need to check all those vital parts. before pulling your head off.
Posted on Aug 08, 2008
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