Question about 1993 GMC Sierra

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93 gmc sierra does not have fule gettin to the injectors wont turn over and think its the relay not for sure

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Its the fuel sending unit

Posted on Sep 13, 2010

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1997 GMC Sierra, I keep blowing the ECM 1 fuse, I replaced Fuel Pump relay and Fuel Filter. Does the ECM 1 Fuse Pump the Fuel Pump, also disconnected the Fiter turned on the key and no fuel.


ecm1 is injectors not fuel pump ecm-b is fuel pump its more likely to be a faulty relay for the injectors, it would be a similiar design to this
12900_oil_sending_unit_and_fuel_pump_circuit_80-yoo05im5qhid2i2poe1uh03c-5-0.gif this is for the fuel system, relay for the injector is nearly the same.

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yes it could be the fule filter . You will need to find out if there is fuel going to the injectors this is easy done by removing the inlet pipe to the injector rail and turning the ignition to postion 2 just before cranck. If there is no sign of fule then it couls be your filter .If there is fuel at the injector rail let me no and i will assits further

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the computer controls the fuel injectors.they should measue about 1.4 ohms each.
put fuel directly into the throttle body and see if it will start.
check the wiring to the safety netral switch and all the grounds.
make sure that the ecu is seeing an input from the ignition switch.otherwise it will not turn on the pump.it is a complex setup and you need a wiring diagram

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I HAVE A 1991 GMC SIERRA PICKUP THAT WON'T START. WE'VE ALREADY CHECKED THE IGNITION MODUAL AND HAVE REPLACED THE COIL,DRIED OUT THE DISTRIBUTOR CAP. IT HAS SPARK IT JUST KEEPS TURNING OVER WITHOUT FIREING...


If you are getting spark then it may be a fuel pump problem or fuel pump relay or inline fuse. Always start Fuel system troubleshooting by replacing the fuel filter or filters! You may be able to apply 12 volts from the battery (use a fused line) directly to the 12 volt side of the fuel pump and listen to see if the pump runs. Also may need to check that it is getting a good ground to the fuel pump. Then if the fuel pump does not run independently, replace the fuel pump. The fuel pump relay is computer controlled and several other things give the computer inputs which then controls the voltage to the fuel pump relay.

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