Question about 1990 GMC Sierra
1990. this should be throttle body injection, you didnt post engine size. Need to check fuel pressure at idle and under load, While driving under hard acceleration. On a carb fuel pressure should be between 4-6.5 psi at all times. TBI should be 9-13 psi. Also on the carbs there is a filter on the carb at the fuel inlet. Need a 1" wrench to remove the line and remove the internal filter.
Posted on Sep 11, 2010
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Posted on Jan 02, 2017
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