Question about 2000 Chevrolet Blazer

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How to change a fuel pump in a 2000 chevy blazer

I have recently changed the injector, the fuel filter , the mass air flow, now as I drive down the street the truck just stalls. If I bang on the gas tank it will restart and go for awhile longer so I have been investigating and have come to the conclusion I need to change the fuel pump. I need to know how to do it?? can someone please help me.........

Posted by itzmejj03 on

  • 2 more comments 
  • itzmejj03 Jul 03, 2008

    Thank you for all your help....

  • Anonymous Jul 09, 2008

    need to change the fuel pump would like instructions on best way to do it

  • EMT Captian Oct 10, 2008

    i cant figure out if there is a top enterance to change my fuel tank

  • Anonymous Mar 12, 2014

    2008 gmc 1500 changed battery,truck now stalls out going down road,restarts same thing keeps happening finally sets a code of po69e-00, changed fuel pump drove it still stalls out,finallt would not start



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Good Day,

I am assuming that you have the 4.3L V6.

The fuel pump is always a pain on trucks becasue you have to remove the tank to gain access. The pump is bolted in on the top side of the tank. I hope it doesn't have a full tank of gas as it needs to be drained(re-use when job is complete). Not to mention pulling a tank that's full of gas very heavy.
See this link for an overview:

Here's how you test the fuel pump relay, and fuel pump:

  1. Turn the ignition OFF.
  2. Remove the relay.
  3. Locate the two terminals on the relay, which are connected to the coil windings. Check the relay coil for continuity. Connect the common meter lead to terminal 85 and positive meter lead to terminal 86. There should be continuity. If not, replace the relay.
Fuel Pump
  1. Turn the ignition key OFF for ten seconds.
  2. Turn the ignition key to the ON position but do not start the engine.
  3. You should here the fuel pump operate for two seconds (a light electrical humming sound).
  4. Apply a 12 volt fused jumper wire to the fuel pump prime (test) connector. This should be located in the driver's side of the engine compartment. The fuel pump should operate.
  5. If the fuel pump does operate, remove and test the relay. If the relay is defective, replace the relay and repeat the test.
  6. If the relay is operating properly, connect a grounded test light to the fuel pump relay control wire (green with white stripe) at the relay. Turn the ignition switch to the ON position. The test light should illuminate for two seconds and go out. If the test light does not illuminate, check the relay control wire for continuity and repair as necessary, then repeat the test.
  7. Connect a grounded test light to the feed wire (orange) at the relay and turn the ignition key ON. The test light should illuminate. If the light does not illuminate, test feed wire for continuity and the fuse in the underhood fuse relay center. Repair as necessary and repeat the test.
  8. If the fuel pump is still not functioning, connect a fused jumper wire between the feed (orange) wire and the fuel pump motor (gray) wire at the relay. The pump should operate.
  9. If the pump does not operate, check the fuel pump motor wire for continuity and repair as necessary.
  10. If the pump will still not operate, replace the pump.
  11. If the pump does operate, start the vehicle and remove the relay. The vehicle should continue to run. If the vehicle stalls, check the fuel pump/oil pressure switch and its wiring. Repair as necessary and repeat the test.
Also see figure 4 which is digram 3 from this link, this is the schematic on the fuel pump, the fuel pump's hot wire is tan with a white stripe, if you can test the voltage of this wire you can confirm it is not an electrical problem.

Also be sure to releive the fuel pressure before servicing

  1. Disconnect the negative battery cable.
  2. Loosen the fuel filler cap to relieve fuel tank pressure.
  3. Connect fuel pressure gauge J-34730-1A or its equivalent to the pressure connection. Wrap a shop towel around the fitting while connecting the gauge to prevent spillage.
  4. Install the bleed hose into an approved container and open the valve to bleed the system. The system is now safe for servicing.
  5. Drain any fuel remaining in the gauge into an approved container.
Let me know if any of this is jibberish to you and I can clarify further.

Good Luck again, and feel free to ask anymore questions.

Posted on Jul 03, 2008

  • David Harrelson
    David Harrelson Oct 31, 2015

    As he said banging on the tank fixes the issue temporarily, doubt the relay is the issue, however, relay may be damaged from bad pump drawing excess current. Always good idea to replace when replacing pump. FWIW, aftermarket pumps are often noisy and failure prone. As this job is a PITA, get a good pump, either from dealer (pricey) or a Delphi brand. NOTE; some folks feel it is easier to remove the bed to service the pump, especially if you have any other reason to do so (eg: body work, wiring, fifth wheel install, etc.).




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Sorry for the interuption, , I'm trying to find where to post a question on this page

Posted on Apr 18, 2010

  • Anonymous Apr 18, 2010

    having trouble starting my 2000 chevy blazer 4 wheel drive on a cold start, need a solution



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