Question about 2000 Chevrolet Blazer

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2000 Blazer S-10...Changed the sending unit,pump,relay,checked wires. Had power then reinstalled the tank-no power again. Even rechecked the whole system over and over...at a lost for ideas??!!??

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It sounds like you have a wire with a short. When you have it down on the ground and connected it works but when you change the position of the wires you lose the connection. Use a thumb tack and penetrate the wire cover 2 to 3 feet back and see if you still have voltage, if you do repeat the process 12 inches back, if you still have voltage then 6 inches until you find the spot where you lose voltage. the break will be between the last point you had voltage and where you lost voltage. It's all a matter of isolation. Good Luck.

Posted on Sep 09, 2009

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1 Answer

Fuel gauge stays on empty even when I fill the tank


In the fuel tank there is a fuel pump module. The sending unit for the gauge snaps on the side of it. GM dealer has it. If you have around 100,000 mi or over that I would just change the whole thing.If it hasn't been changed before or don't know. The gas tank has to be removed to do any of it. On the sending unit had 4 or 5 tiny contacts and they would brake off. the new sending units are made better.

Jul 02, 2012 | 1999 Chevrolet Blazer

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Replaced fuel pump truck ran fine then sendingunit quit working . i was checking fuses by pulling them one at a time now fuel pump will not work checked to see if it had power to pump .could not get power


The oil pressure send ing unit is a back up power supply for the fuel pump moter its a safty thing. Check fuse # 9 When the fuel pump is replaced the wires need to be cut and spliced because they had a problem with the wires giing to the pump over heating so the new pump has a differant connector the old one will not fit into it check the 4 wire connection splice I dought its the relay thats in the glove box thats what the back up is all about through the oil pressure unit the vehicle would still get power to the fuel pump even if the relay was bad I have a wireing schematic of a 2000 if you want it give my an Email address and i will send it to you pier-j

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1 Answer

2000 s-10 4 cyl. truck runs good gas gadge gose from full to emty with a full tank or emty tank dose not matter? whats the fix!


had the same problem on my 2000 s-10 ,turned out the wire from sending unit had worked loose(bad crimp). The fuel pump had recently been replaced. the connector to the sending unit was different from original . the new pump included the different connector ,but it had to be spliced in .Check connections at tank/fuel pump.Also there were 3 ground connections 1 tank to frame 2 bed to frame on my s-10 hope this helps

Mar 30, 2011 | 2000 Chevrolet S-10

1 Answer

Just replaced fuel pump 2000 blazer. different wiring harness/connector. wired like intructions said. won't come on. no voltage present. help.


Did you check for power before replacing the pump? It's possible that it wasn't the pump at all. Check for power to and from your fuses and fuel pump relay.....If you need, send me your email address and I can send you the wiring diagrams.

Mar 18, 2011 | 2000 Chevrolet Blazer

1 Answer

Is there a fuel pump reset switch on the blazer?


No there is a relaly thats inside the glove box behind a cover but on this vehicle even if the relay blows it has a back system that works through oilpressure sending unit and would still supply the pump with power.The wireing to the pump is difficult to axess it runs down the top of the tank you need to lower the tank a few inches to get at it . But these pumps normally last 10 to 12 years to begin with so you may just need a new pump

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1 Answer

2000 Blazer Will not stay running


Wow, you seemed to have changed what I would have recommended to someone in your shoes.

If the fuel pump relay is hot, I think that there could be a crossed wire somewhere.

I would take it to an auto electric shop to diagnose problem if it's worth putting more money into it.

Jul 05, 2010 | 2000 Chevrolet Blazer

1 Answer

I own a 2000 chevy blazer with a 4.3 v6 vortec. It will turn over but not start up. I replaced the fuel pump, the fuel filter, the plugs and wires, and the pressure regulator. If i dump a little gas in the...


did you check power and ground at the fuel pump connector?there should be power at two wires at the connector,one should have constant power with the key on and thats for your fuel gage,the other power wire should have it only when cranking or for about 3-5 seconds when the key is turned on,check both of those first and that will let you know that everything is fine all the way forward of that connector,also did u replace just the pump or the whole sending unit?if you just replaced the pump the connector that runs fron the sending unit to the actual pump itself inside the tank also goes bad on this setup too,look for brown or burn marks on the inside of the sending unit where this connector hooks uo,hope this helps

Sep 11, 2009 | 2000 Chevrolet Blazer

1 Answer

SENDING UNIT ???????


most of fuel pumps were in tank, wire corrodes is harness under right front seat floor pan to tank
if fuel pump buzz is heard and car runs and when it doesnt run you cant hear the fuel pump try
turn ignition off wait 10 seconds
turn ignition to on position to (prime or hear pump buzz)
no buzz fuel pump not working check fuel pump relay(swap with another) and try again?
you could use test light to pump wiring and make sure your getting power to pump on this prime test no power relay or wiring problem.
power at pump, but no buzz fuel pump faulty

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Where is the fuel pump located on a 1994 chevy blazer


it is located in the fuel sending unit at the top of the tank. You have to remove the tank to get to it.

Jun 10, 2009 | 1997 Chevrolet Blazer

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No power from wiring harness to fuel pump on 2000 s 10


on the drivers side left rear frame next to bumper bracket there is a ground for the fuel pump make sure it is not cut or rusty . the 4.3 has a oil sending unit at back of intake it controls fuel pump . oil sensor tells the computer to give power to fuel pump.

Apr 11, 2009 | 2000 Chevrolet S-10

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