I dont have current at the fuel pump. i've just replaced the main relay and i know the fuel pump works.i have current to all the fuses under the dash and under the hood. there is one fuse under the dash that says fuel pump-alternator and its good. the engine runs by spraying a little gas into the intake, so i know the engine runs.
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The fuel pump is powered from a relay. That relay is powered by the engine's computer ("ECU"). The relay is necessary to scale the low current control signal from the ECU into a high current switch to operate the fuel pump. The high current circuit will likely contain a fuse. That fuse or the fuel pump relay may be defective.
The fuel pump relay is activated for a few seconds when the ignition is turned on before starting the engine. If everything is working properly, you should be able to hear the fuel pump run for those few seconds before starting the engine. This is so the injectors have adequate fuel pressure before the engine is started.
Here's a technique that works for me. Locate the fuel pump relay, in the fuse and relay panel. Pull the fuel pump relay and look at the bottom of the relay. You will see that the cover can be removed by carefully prying it off using a small flat blade screwdriver or an x-acto knife. Once the cover is removed, reinstall the relay. Have someone start the car while you watch the contacts on the relay. If the contacts close, the relay is OK. If you turn the key to on without starting the car, you car close the relay manually. (You can use your finger to close the relay. Listen carefully, at the fill tube with the gas cap removed. If the fuel pump is getting power you will hear the whine of the motor. If not then check the fuel pump fuse first then the 12 volts at the connector on top of the fuel tank. I've had a problem such as you described, where the car will start but stalls if you try to give it gas. I found that some GM's use a small (2 inch)section of rubber hose to connect the pump to the steel fuel line inside the tank. The hose splits which allows enough fuel to reach the engine, but not enough to run it under any load. The fuel filter should be replaced if it is suspect, but probably isn't your main problem. Hope this helps! Dano
Under the hood, there should be a fuse block. Remove the cover and there will be a 20amp(i think) fuse that protects the fuel pump and starter circuit. I've run into this problem many times and every time it ends up being the starter that blows the fuse.
Underhood fuse block swap out relay #7 thats the ECM relay. Ground Circuits Using a DVOM, touch negative voltmeter lead to a good ground. Touch positive voltmeter lead to each ground terminal. With vehicle running, voltmeter should indicate less than one volt. If reading is greater than one volt, check for open, corrosion and loose connection on ground lead. See ECM GROUND LOCATION table for ECM ground location. Page 1 of 1 SYSTEM/COMPONENT TESTS - 2.6L EFI -1994 Isuzu Rodeo
hi tony, i had that same problem come through my shop! i eventualy (hours) found the burnt wire in its clear plastic connector in trunk, above backseat headrest. (top and back of trunk). i hope this helps, so you dont have to do what i did...LOL good luck, marty