1999 Other GMC Models bacfire

1999 GMC
19,999 MILES • V8 • 2WD • AUTOMATIC
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JIMBENNETT
  • MEMBER
  • 1 POST
1999 gmc 6500 top kick propane fuel system loud backfire on take off need help
Apr 18, 2009 at 2:13 AM
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MICKEY-D
  • ✓Experienced Mechanic
  • 304 POSTS
I believe you might have some moisture trapped in the propane lines, or in the fuel distribution valves. You might want to get a manual on this truck to troubleshoot it properly.
Jan 17, 2010 at 1:06 PM
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