Question about 1991 Chevrolet S-10 Blazer

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91 blazer 4.3 not getting fuel to motor

Need to know where the wiring harness is for the fuel pump and if a external fuel pump can be used  and bypass the the other fuel pump    when i pour gas down the throttle body it will run   and when i check the fuses they are good but the wire i found at the tank doesn't show any power  not sure what's wrong

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Find the fuel pump and get it cleaned out,there could be **** in it.it will be blocked

Posted on Apr 18, 2009

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There should be 2 or 3 wires into your tank.

When you first turn the key to the on position, but not all the way to the start position, do you hear the pump run at all?

If not, look in the under hood power distribution box for a relay marked fuel pump. check if there is power there. if yes, check to see that power comes from the relay when activated.

If all is ok there, remove the fuel tank from the vehicle and replace the fuel pump.

Posted on Apr 18, 2009

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1 Answer

2001 chevy blazer replaced fuel pump with fuel pick up switch and fues guage still does not work


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I need to know how to check the fuel pump relay. If it is good, my fuel pump is bad. Can I by-pass the internal gas tank fuel pump and put an external one on. This is for a 2001 chevy blazer. Is it...


no bypass. There is no switch (Fords only) there are several relays that are th esame, you can swap it with the horn relay. You should be able to hear the relay turn the pump on for 2 seconds when you turn the key on. Sometimes you can give the bottom of the fuel tank a rap and it will get pump going again for a short time, If that gets it going, replace the pump ASAP.

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Was the wire harness replaced from the fuel sending unit to the frame, it's a good practice to replace the wire harness when the sending unit is replaced. The wires are know to break and cause sending unit issues from weak fuel pressure to faulty gas gauges.
The other possibility would be a faulty connection to the stepper motor in the gauge it self or just a faulty stepper motor that would need to be replaced. You can do a search on Ebay for stepper motors for your fuel gauge which runs for around $15.00 which is much better then $400.00 for a new cluster if it is and bad fuel gauge stepper motor.
Thank you for using fixya and good luck.

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did you recently change the fuel pump? If so you needed to change the wire harness thats attached to the fuel pump, then if not, your floater need to be replaced inside your fuel tank.
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2 Answers

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