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Fuel pump relay please?

Tiny
JIM109
  • MEMBER
  • 1999 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 14,100 MILES
Hi I replaced fuel pump last year. Now im having problems with the relay can you tell me where it is?
Tuesday, September 21st, 2010 AT 9:02 AM

24 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi jim109,

here is guide to help you check it with the relay location in the diagrams below.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (Below). Please let us know what you find.
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Tuesday, September 21st, 2010 AT 10:27 AM
Tiny
JIM109
  • MEMBER
  • 4 POSTS
Thank you the relay was bad Im back on the road!
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Tuesday, September 21st, 2010 AT 12:35 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Nice work, we are here to help, please use 2CarPros anytime.
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Wednesday, September 22nd, 2010 AT 8:30 AM
Tiny
ERIKFAST
  • MEMBER
  • 6 POSTS
  • 1998 CHEVROLET BLAZER
Electrical problem
1998 Chevy Blazer 6 cyl Four Wheel Drive Automatic

I cant start my 1998 Chevy Blazer. It will try to start, but it will not catch. I believe there is a problem with fuel getting to the engine. I had to have the fuel pump replaced a couple of years ago and it cost about a grand (500 for the pump and 500 in labor). I would rather not do that again if I can help it. What are my options? First, I do not know if the relay is good or bad. How do I check this? Second, if it is the fuel pump, is this something that I can reasonably do myself in my drive way?
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Saturday, January 30th, 2021 AT 8:31 AM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Follow this link to learn how to test a relay .. https://www.2carpros.com/how_to/how_do_i_check_a_relay.htm

may want to test the pump before throwing money at it. would you like test procedures for the pump?
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Saturday, January 30th, 2021 AT 8:31 AM (Merged)
Tiny
ERIKFAST
  • MEMBER
  • 6 POSTS
Bluelightnin6 - if you have a procedure to test the fuel pump I would really appreciate it!
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Saturday, January 30th, 2021 AT 8:31 AM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Ok first lets test the fuel pump oil pressure switch (back up circuit for the pump). To do this start the engine. With engine running remove the fuel pump relay we discussed earlier. If the engine stalls with the relay removed then your fuel pump oil pressure switch is faulty. If it continues to run then we can move on to testing the pump itself. Let me know if we need to test that pump out
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Saturday, January 30th, 2021 AT 8:31 AM (Merged)
Tiny
ERIKFAST
  • MEMBER
  • 6 POSTS
Bluelightnin6 - I can not get the car to start. All it does is the vroom vroom thing, but it wont acrually catch. Can I do this test without actually being able to get the engine to run?
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Saturday, January 30th, 2021 AT 8:31 AM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Okay, have a helper try starting the vehicle while you (or visa versa) knock on the fuel tank to jar the pump. If it starts up then you know pump is bad. This is a easy test to do without all the expensive gadgets ;)
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Saturday, January 30th, 2021 AT 8:31 AM (Merged)
Tiny
ANDREWB0509
  • MEMBER
  • 1 POST
  • 1998 CHEVROLET BLAZER
  • 4.3L
  • V6
  • 4WD
  • AUTOMATIC
  • 278,000 MILES
My fiancée took my blazer to the bus stop to get our kids. She could not get it started back up. With the fuel pump connected to the vehicle, you can't here it kick on when you turn on the key. So I tried changing the pump and it didn't work. I hooked my original fuel pump to my 12 volt battery and it kicked on. I have also checked the relay (I had a friend show me where it was so I am not sure he was right). I am not sure where the fuse is. The wiring harness was broken by the previous owner but not fixed right so there was some corrosion. I cut off the corrosion and reattached it. Still didn't work. So where can I go next?
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Saturday, January 30th, 2021 AT 8:31 AM (Merged)
Tiny
CARADIODOC
  • MECHANIC
  • 33,916 POSTS
Is your gas tank steel or plastic? Have you checked for 12 volts and ground at the connector at the tank? You'll need a helper to check for 12 volts. You should only see it for one second after turning on the ignition switch. A test light is much more accurate for this than a voltmeter. If you don't have a helper, remove the fuel pump relay and bypass it, then you should have 12 volts back there all the time.
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Saturday, January 30th, 2021 AT 8:31 AM (Merged)
Tiny
OSCODAPAT
  • MEMBER
  • 4 POSTS
  • 1998 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 151,480 MILES
I have replaced my fuel pump but it not whurring when I turn on the key. Where is the fuel pump relay on this model. It not on the pass side firewall nor behind the glove box. On the fuse box is one power relay and that one is good. There seams to be no power to the the pump.
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Saturday, January 30th, 2021 AT 8:31 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Its inside the underhood bussed electrical


https://www.2carpros.com/forum/automotive_pictures/12900_relay_box_1.jpg

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Saturday, January 30th, 2021 AT 8:31 AM (Merged)
Tiny
OSCODAPAT
  • MEMBER
  • 4 POSTS
Is it under the inside fuse box or just the one on the fuse box
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Saturday, January 30th, 2021 AT 8:32 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Its inside the bussed electrical center-don't have the info on which is which tried but couldn't come up with it-
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Saturday, January 30th, 2021 AT 8:32 AM (Merged)
Tiny
OSCODAPAT
  • MEMBER
  • 4 POSTS
  • 1998 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 151,480 MILES
I've replaced my fuel pump and checked my fuel relay but still dont have power to the pump. Any ideas
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Saturday, January 30th, 2021 AT 8:32 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
All you got is 2secs to check for power before the fuel pump relay de-energizes then you lose power to the pump.

The computer energizes the fuel pump relay. Did you check the fuel pump fuse?


https://www.2carpros.com/forum/automotive_pictures/12900_oil_sending_unit_and_fuel_pump_circuit_55.gif

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Saturday, January 30th, 2021 AT 8:32 AM (Merged)
Tiny
JUNEC_NEV
  • MEMBER
  • 4 POSTS
  • 1997 CHEVROLET BLAZER
  • 200,000 MILES
Just replaced fuel pump resently but my fuel gage is still not working right, when the gas pedal was pressed and exceeds about 40 mph, or say gets a little warm. The needle on the gauge goes all the way down the full gas, way way down, I was thinkin if it is related to a some relay. And where it is located.
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Saturday, January 30th, 2021 AT 8:32 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
No, the sender is most likely the issue. Did you replace the entire module or just the pump?

Roy
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Saturday, January 30th, 2021 AT 8:32 AM (Merged)
Tiny
JUNEC_NEV
  • MEMBER
  • 4 POSTS
It was a entire module, airtec brand. Did some wiring in it because the connector that comes with it is a inline, the old one is square. It got purple, gray and two black wires.
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Saturday, January 30th, 2021 AT 8:32 AM (Merged)

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