i learned a good lesson last year .....motor kept leaning at half tank of fuel so i tuned it with half tank.. then filled tank up and it was to rich ...chased a tune for awhile..because i checked carb, fuel lines,filter, plug

long story short fuel tank pick up had a crack in it and wasnt sucking in air untill i opened throttle up on runs so i didnt see air bubbles in fuel line while car was stationary switched tanks and motor was perfect after i went back to old needle settings...

dont allways assume its just your motor ....clear or semi clear fuel lines is all i run now makes it easier to spot air bubbles

not saying this is the fix to probs some of you are having....just remember it could be

all these team guys and no one can tell me were to get the new white t-shirt?