Quote:
Originally Posted by FWB
thank you patrick for showing us how much you know.
the adjustment for a pump shot is at WOT. for a stumble
but to get back to the problem of fuel dribbling at shut off the pump lever should not be in contact with the pin on the pump. to adjust that at WOT will not help this.
some slop .010-.015 at idle should be there or the off idle circuit will be sending fuel to the venturies and cause a dribble. you can hear it dribbling sometimes in the exhaust at idle....a little fluctuation in tone
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The .010-.015 is to make sure the pump diaphragm doesn't bottom out.
The pump override spring serves a dual purpose in this regard.
You should have NO slop in the linkage to give immediate fuel delivery on tip-in.
The pump cavity is vented back to bowl to keep it vapour free and bleed some fuel back on slow throttle openings.