1993 Chev S-10 Blazer Won't Start - Electrical & Lighting Systems

Question: When turning the key the motor turns over and it sounds like it is either flooded or out of gas. I have found that by getting under the rear bumper and merely touching "flicking" two wires that I believe are going to the fuel pump that the vehicle will then start immediately the next time I turn the key. One mechanic has told me that when this happens to leave the key in the "on" position and try to listen to see if I can hear the fuel pump start when I touch the wires. I have tried to listen for the sound of the pump but so far have not heard any difference or pump running after I tug on the wires. There are three wires which appeared to be locked or clamped to a connector by the gas tank, but a third wire is not connected. When I recently took my vehicle in for an unrelated issue I asked them to look at the fuel pump and they said they could not see anything unusual. I do not know if there is a short or some other electrical issue - however on occasion when I engage my turn signal my wipers will start. This is frustrating because sometimes it will go for weeks without failing to start and then sometimes such as today, it happened twice. Other than this issue the vehicle has been well maintained and only has 137, 000 miles.

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Technican: Hello, What size engine please? When the ignition key is turned ON, but not turned to START, the computer will run the fuel pump for two seconds to pressurize the fuel lines and then the pump will stop. To hear what the technician was talking about it must be pretty quiet or you would need to be near the fuel tank when someone else turns the key to ON. The computer will do this pressurizing of the fuel line everytime you cycle the key from OFF to ON so you should hear it each time provided the key is cycled with about five seconds between attempts. Moving the wires back at the fuel pump that causes a favorible result speaks to a connection problem. The fuel pump has a wire harness pig tail that arrives at the connector near the tank in plain sight. When removing the fuel tank this is where the pump is disconnected from the vehicle harness. This connector should have a weather seal to keep it clean. The seal can be seen if you disconnect the connector and look at the male end. The seal is often a light green color. Inspect inside the connector for loose or backed-out terminals, corrossion, signs of heat and general condition. Look at the routing of the wire for any place that could pinch or wear the wire insulation. Repair as needed. You said one wire did not appear to be connected. What color is this wire? The windshield wiper switch is seperate but mounts on the side of the turn signal switch. The wires for the wiper switch or the switch itself may be worn and the action of moving the turn signal lever may be resulting in the unwanted temporary wiper operation. The wiper switch will likely need replacing in the steering column. Questions? Fire away,

Technican: What is happening here, please?

Owner: I have not had time to check the color of the hanging wire. Thanks for the great information though - engine size is 4.3L - V6. I will get back when I have followed through with your instructions

Technican: Cool, I'll wait for your reply.

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1993 Chev S-10 Blazer Won't Start - Electrical & Lighting Systems

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