Question about Chevrolet S 10

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I have a 1991 s-10 blazer it will not start it will turn over. I have change the oil pressure switch and the fuel pump relay switch. I do not hear the fuel pump working but i tested it and no power going to the fuel pump when i do put power to it then it will crank. I have wire a switch to turn the pump on and off. But i just do not know what else it could be i am puzzle.

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If you have power at the fuel pump relay than you have to chase the wires to the back,somewhere is a problem look for areas where wires would chafe or get pinched also pull apart any plugs you see many times water gets in and corrodes the pins,you will find it.

Posted on Feb 05, 2010

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1997 blazer . Have to prime to start changed fuel regulator and oil pressure switch ( fuel pump relay in oil pressure switch) same problem


Sounds like your pump not working. Can you hear it buzz on for couple of seconds when key is turned to on?
A fuel pressure test will verify if pump is working up to par.

Oct 31, 2011 | 1997 Chevrolet Blazer

1 Answer

My 1993 s10 blazer is hard to start, cold starts runs for 15 seconds then dies and wont start after that! have fuel pressure and can hear pump run. good spark what could it be?


Check the fuel pump relay its inside the glove box the one on the left side of 3 relays . The fuel pump will still work on this vehicle ever if the relay is bad . The system is backed up by the oil pressure sending uint and that will supply power to the pump it just takes it some time for the engine to build up enogh oil pressure to trip the switch so it takes a long time to start and you may think of replaceing the unit as well that could be intermitant also check your fuel filter its under the drivers side door mounted to the frame

Feb 05, 2011 | 1993 Chevrolet S-10 Blazer

1 Answer

Wont start unless manually primed


Turn the ignition key to the ON position without starting the engine

You should hear the fuel pump priming for about a few seconds then shutting itself off.
If not hear replace the engine oil pressure switch
The 3rd wire to that switch is the pumps prime switch lead.
When the engines oil pressure is reached the computer will shut that circuit off and turn on the fuel pump relay
If you hear the pump prime the relay maybe at fault instead

Jan 19, 2011 | Chevrolet 1500 Cars & Trucks

4 Answers

Im working on a 95 s10 blazer.It has the 4.3 engine.It will only start if it is sprayed with starting fluid.the fuel pump,fuel filter,and pressure regulator have all been replaced.Seems like the system...


It sounds like the fuel pump is not working. Perhaps the install was not completed correctly. Things to check, fuel pump relay, wiring, voltage to the pump.
The priming happens as soon as you put the key in and turn it to "acc" (you may hear a humming sound). Then once you turn it to "start" the injectors and spark plugs start firing.
Another possibility is that the fuel filter was installed backwards.

Apr 22, 2010 | 1995 Chevrolet S-10 CA Edition

2 Answers

Fuel shut off switch , where is it


Ford had a shut off switch only. It is a saftey design Fors had for decades and no other Car maker has this option as of yet
Yours will have a fuel pump fuse, a relay to the pump. an oil sensor that is runs the fuel pump only upon starting up the engine and shuts off upon when the engine reaches normal oil pressure. When the sensor shuts off the fuel pump relay takes over until the engine is shut off. When you turn the key to the on position you will hear the fuel pump working inside the fuel tank. No need to turn the key to the start position only to the on position. If the pump is not working you have either a bad fuel pump or a oil pressure sensor. If you do hear it pumping for 5 seconds the engine should fire and die out telling you the relay or pump is bad

Apr 17, 2010 | 2000 Chevrolet Blazer

1 Answer

My car turns over starts then cuts off


The fuel pump operates off two items upon starting the car. When you first turn the key to the ON position you can hear the fuel pump faintly running inside the fuel tank. If you can not hear it it seems it is working for you stated the engine starts then cuts off. That tells me the engines oil pressure switch is working the fuel pump. On the oil pressure switch this switch has a third wire which is directed to the fuel pump. When the engine reaches full oil pressure the computer shuts off the signal from the oil pressure switch and then the computer turns on the fuel pump relay which stays on until you shut the engine off. I do beleive the fuel pump relay is what you need for it is not working no longer. This will have many relays with the same part number on it. You can easily swap any relay that looks the same with the same numbers on it and try it once to see if the engine stays running.

Apr 09, 2010 | 1990 Oldsmobile Cutlass Supreme Conv

2 Answers

No power at fuel pump


Your fuel pump relay is triggered by your oil pressure switch,try jumping across to bypass your fuel pump relay if truck runs then figure out why relay is not being triggered.

Aug 24, 2009 | 1997 Chevrolet Blazer

1 Answer

Where is fuel relay


The fuel pump relay is only for the fuel pump priming when you turn on the key. After the vehicle starts the oil pressure switch takes over and runs the pump. If the pump is shutting off after the motor is running the oil pressure swith is probably bad. Let me know if i can help you further.

Dec 27, 2008 | 1994 Chevrolet S-10 Blazer

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