Question about 1994 Chevrolet S-10 Blazer

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94 s-10 blazer won't start

So far I replaced fuel pump, fuse, relay, cleaned ground wires, sending unit! is there an emergency shut off switch someplace that could be causing me trouble? or is there a module on the distributor that controls spark and fuel?

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  • Anonymous May 13, 2009

    I have the same problem with my 1994 S-10 Blazer. Changed out battery, had starter tested, it passed, it still won't start. I have all lights, heater, radio, etc. but when you turn ignition, all you get are clicks. Any ideas?



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The 92 S-10 I had did not have an emergency shut off.Yours may, or may not have, depending on what previous owners may have done to the vehicle.

You need to get a factory service manual (not Haines or Motors or Chilton) to diagnose the problem, Most larger repository libraries have them. The FSM's have complete troubleshooting guides.

Posted on Jan 24, 2009


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Two of those wires are for the sending unit for the fuel gauge .The pink with black stripe is B+ to fuel pump , black is ground for fuel pump other two are for fuel sending unit . There is all so a relay in the under hood fuse box for fuel pump an fuel shut off inertia switch . Before messing with fuel pump wiring check if inertia switch is tripped , Check out this videos on fuel pump circuits . Fuel Pump Electrical Circuits Description and Operation

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If you mean the inertia switch that shuts off fuel in the event of a crash, that is a Ford only part-no others have them.
Does your fuel pump turn on for 2 seconds, with key on, not start? If no, check the ECM-B fuse (20 amp) in the power distribution box by left (driver's) fender. This fuse sends power to the fuel pump relay, also in the distribution box.
To verify a bad fuel pump, check for power on the pump wire at the fuel tank connector with the engine cranking over. It is a gray wire. It should also have that 2 second signal with key on. But with engine cranking over, it should be a steady power signal. If power is on the wire, before condemning the pump, check the fuel pump ground. If ground is good, the pump will have to be replaced.
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Apr 11, 2014 | 1999 Chevrolet Blazer

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1989 ciera orange wire going to the oil pressure switch was accidently grounded. Will turn over backfire but not start . Fuel pump won't power up. No power to fuel pump relay. Took relay apart manually...

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You can check the fusible links near the starter for continuity. If one of them is burnt up start there by replacing it. If none of them are bad you will need to find the inline fuse. At least the 3.3 liter engine is set up this way.

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Where is the fuse in the fuse panel for the fuel pump because of the fuel pump is new same thing with starter but will turn over but no fire so needs to find out where the fuel pump fuse is

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I personally like to backprobe the power wire to the fuel pump (large purple wire) as close to the fuel pump as possible and with the fuel pump connector plugged in. This will tell me three things.

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3. Power is supplied to the pump for 3-5 seconds when the key is turned on. This lets me know the PCM is working correctly and receiving the crank signal from the ignition switch.

If all those check out check the ground circuit to make sure it is complete. Check for voltage on the ground wire while the pump is being powered up. If there is voltage on the ground circuit than there is resistance in the ground circuit which again could be corroded wires or corroded contacts where it meets the body.

I am pretty sure this one has a metal sending unit (the part the fuel pump mounts to. If it does and you reused the old one make sure the four wire connector that plugs into the top of the sending unit on the inside isn't burnt up. The pin that supplies power to the pump likes to burn up on these. I know it sucks that you already have it back together but if all of the above check out that is a possibility that needs to be explored. I would say that about 75% of the time the sending unit needs to be replaced because of this.

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The relay will not operate untill the engine has normal oil pressure
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2001 Jimmy shut down while driving. The ECM1 fuse blew. Replaced fuse and it blew. disconected circuits related to ECM1 fuse. reconected one circuit at a time. Fuse did not blow and Jimmy started. Why?

The first thing you should do is to locate the oil pressure switch/sending unit.

It's a single wire terminal with plastic connect sensor from the engine block.

This switch serves two functions.

1) provide oil pressure reading

2) disable the fuel pump relay in event of oil pressure loss.


When this switch is failing to provide the correct pressure to the ECU. The wiring harness can overheat and eventually create a short.

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DO NOT drive the truck until you change the oil pressure switch.

After you change the switch,you should spend sometime to inspect the wiring between the fuel pump relay,ECU and fuel pump.

Please post up day on the comment window/page.

I will follow up on it later.

Good luck.

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