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08-03-2022, 01:43 PM | #26 | |
Registered User
Join Date: Apr 2016
Location: Sacramento, CA
Posts: 11
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Re: 1968 GMC 250 Inline 6 4.1L Chugging
I went through a similar problem with my 292, replaced many parts just as you during the process of elimination. All of the items helped, HEI, fuel pump, filter, carb rebuild, etc. but problem would return after awhile. Turned out the fuel tank had rust buildup that would come loose, plug a carb jet or eventually plug the fuel filter. Pulled the carb apart several times to just find more rust getting past filter. Cleaned it all out and ran great! Just my 2 cents.
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1968 GMC 1500 LWB 350 V8/TH700R4 1970 CST-10 SWB 350 V8/3-Spd Saginaw 1967 C-10 |
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1968, 250, backfire, chugging, gmc |
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