Fuel pump not getting power

1993 CHEVROLET CHEYENNE
237,000 MILES • 6 CYL • 2WD • AUTOMATIC
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MRUCKER
  • MEMBER
  • 3 POSTS
1993 chevy cheyenne - won't start - not getting any fuel. Have replaced fuel pump, relay switch, fuel pump oil pressure switch and fuse. Started and ran but will not start again. Fuel pump will start and run and then won't run again with no power to fuel pump.
Jul 9, 2011 at 4:57 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
This sounds like the ignition module might be going out because if the engine loses spark the PCM will not turn the fuel pump on. When the fuel pump stops lets test for spark this video will help.


https://youtu.be/baq_aEWNQ0Y?si=amrSIjpn6nAgq2cD

Please go over this guide and get back to us.
Jul 9, 2011 at 5:02 PM
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MRUCKER
  • MEMBER
  • 3 POSTS
Turned key on and fuel pump does not run. Have already put two relays on thinking the first relay might have been bad. It started today after replacing the fuel pump oil pressure switch. It ran on and off during the day when started. Put gas tank back on truck and it wouldn't start. Took gas tank back off and got it started one or two times and now it won't start again.
Jul 9, 2011 at 5:31 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
TBI, CPI or MPFI fuel system ? Verify the fuel pressure and comback with the actual readings
Jul 9, 2011 at 5:37 PM
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MRUCKER
  • MEMBER
  • 3 POSTS
TBI fuel system. I thought I would tell you the ignition coil was shorting out and stopping the spark, I got a new coil and it started right up, thank you
Jul 10, 2011 at 6:25 PM
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