1991 Chevy Suburban fuel filter/fuel pump

Tiny
CATFISH71
  • MEMBER
  • 1991 CHEVROLET SUBURBAN
Engine Performance problem
1991 Chevy Suburban Four Wheel Drive Automatic 250000 miles

i have a 6.2 litre diesel. I changed the fuel filter and mechanical fuel pump and have fuel to the pump and filter but it still wont start. What should I do
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Tuesday, June 1st, 2010 AT 1:12 PM

6 Replies

Tiny
BLUELIGHTNIN6
  • EXPERT
Check fuel pressure to ensure there are no restrictions. If pressure is OK then check spark at the plugs, make sure it is bright blue spark.
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Tuesday, June 1st, 2010 AT 1:15 PM
Tiny
CATFISH71
  • MEMBER
How and where do I check the pressure. Also I have glow plugs not spark plugs
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Tuesday, June 1st, 2010 AT 1:21 PM
Tiny
BLUELIGHTNIN6
  • EXPERT
Sorry didn't realize it was diesel.

Test the glow plugs first

Pull the electrical connector wires off to expose access to the glow plugs. Removing one plug at a time, place the socket over the top of the glow plug and turn it counterclockwise to remove.
Clean the threads of the glow plug with solvent and a rag.
Set your voltmeter to "Ohms" ( ©) and touch the electrodes of the voltmeter to the glow plug.
Check to see if the resistance shown on the meter indicates " ". If it does, then the plug is defective. If the glow plug shows resistance that is approximately less than 5 ©, then the plug is not defective.
Repeat above steps for each glow plug.
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Tuesday, June 1st, 2010 AT 1:24 PM
Tiny
CATFISH71
  • MEMBER
Before I changed the fuel filter and fuel pump it was running rough
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Tuesday, June 1st, 2010 AT 1:26 PM
Tiny
BLUELIGHTNIN6
  • EXPERT
Was the check engine light coming on or staying lit? So it was running prior to replacing pump?
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Tuesday, June 1st, 2010 AT 1:27 PM
Tiny
CATFISH71
  • MEMBER
No the check engine lite wasnt on, yes it was running prior to changing filter and pump
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Tuesday, June 1st, 2010 AT 1:29 PM

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