Fuel pump

Tiny
DUSTIN L DREW
  • MEMBER
  • 1994 CHEVROLET BLAZER
  • 4.3L
  • V6
  • 4WD
  • AUTOMATIC
  • 170,000 MILES
Just replaced the fuel pump and it kicks on to prime but it does not not turn back on when cranking. It also loses fuel pressure. We wires the pump up so it always run and it has great pressure but other then that it loses most of it
Sunday, June 11th, 2017 AT 2:27 PM

1 Reply

Tiny
FREEMBA
  • MECHANIC
  • 1,152 POSTS
There could be several reasons for this, but try this first, check the ECMB fuse in the fuse box on the left side of the dashboard. Next, switch the fuel pump relay (located under the center of the instrument panel) with an identical relay [there is at least one identical relay in that same fuse box, if not, there is one in the under-hood fuse box]. Try to start the engine normally. If it does start normally, then the problem is a defective relay.
If not, try this, Use a multi-meter to check the white wire (terminal D) of the four wire connector coming from the distributor to see if it pulses voltage when the engine is running. If not, the problem is likely a faulty ignition control module. If so, check for corrosion at the connector going to the fuel pump.
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Sunday, June 11th, 2017 AT 3:19 PM

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