Gettin' a little smokey
#11
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Join Date: Jan 2001
Location: Cincinnati, OH
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Check to see that the fuel pump is not bypassing fuel into the carb. We had an HP500 that had a bad fuel pump diaphram and it was dumping lots of raw fuel right into the carb. It ran like crap and smoked, especially at idle. Once we saw the fuel going through the "site tube", we knew it was a bad fuel pump. Replaced the fuel pump and the problem went away.