1999 CHEVY BLAZER NO POWER TO FUEL PUMP

  • Tiny
  • rlmk1109
  • 1999 Chevrolet Blazer

Electrical problem
1999 Chevy Blazer 6 cyl Four Wheel Drive Automatic 140000 miles

just installed a new fuel pump because I thought the old one was bad. When I try to start my truck im not hearing the pump come on. Ive checked all the fuses and checked the filter to see if it was clogged. My pump is not working is all I can figure because there is no gas makeing it to the filter. Ive heard that there is a low oil pressure fuel cut off valve on this model of blazer, could this be the problem?

Thursday, November 19th, 2009 AT 3:21 PM

7 Answers

  • Tiny
  • JDL
  • Expert
  • 16,236 posts

Welcome to the forum, thanks for the donation. Did you check voltage circuits at the fuel pump relay? Voltage to load side of relay should be hot all the time. Voltage to coil side of relay goes hot for a few seconds, key on, and hot with engine cranking. Voltage to the coil comes from pcm. Can you check for codes?

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Thursday, November 19th, 2009 AT 3:54 PM
  • Tiny
  • rlmk1109
  • Member

I have power to one of the 4 fuse entry ports, but after that nothing with the key in the on position.

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Thursday, November 19th, 2009 AT 5:18 PM
  • Tiny
  • JDL
  • Expert
  • 16,236 posts


http://www.2carpros.com/forum/automotive_pictures/170934_blazer_fuel_pump_1.jpg



The green wire with the white tracer is voltage for coil side of relay, hot for a few seconds when you you turn key on, no crank. Engine cranking, should be hot all the time. If nothing there, take circuit loose at both ends, check for continuity, if no continuity, replace wire. If continuity ok, check for pin voltage for that wiring circuit at the pcm. It may not be 12 volts, it maybe 5 or 6? If no voltage when there should be, you need to check the pcm.

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Friday, November 20th, 2009 AT 9:31 AM
  • Tiny
  • rlmk1109
  • Member

What is the PCM and where is it?

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Friday, November 20th, 2009 AT 9:59 AM
  • Tiny
  • JDL
  • Expert
  • 16,236 posts

On your vehicle, it may be called vcm, vehicle control module. Under the hood, passenger side front. You need to do some testing, before replacing anything.

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Friday, November 20th, 2009 AT 10:32 AM
  • Tiny
  • hilfiger_676
  • Member

Do all of your dash lights and radio come on when you turn the key forward?

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Wednesday, November 25th, 2009 AT 9:59 PM
  • Tiny
  • rlmk1109
  • Member

Yes, I am getting power to my dash. But to let you know, I did get the thing running. After going back and checking all the fuses and relays, I found that a celnoid on my injection sustem was grinding and makeing a bunch of noise. I took the thing loose from the side of the injection system and cleaned it, put it back on and Bin-Go power went to my fuel pump and the truck fired up. Im going to replace this old celnoid with a new one. Thanks for your help. You got me headed in the right direction and the rest was just back tracking. Thanks again.

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Tuesday, December 1st, 2009 AT 4:02 PM

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