Holly 650

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does the arm move? is the arm connected....is there a rubber diaphram in the pump?

is their a pump cam on the throttle shaft?...is the pump linkaged adjusted right?

does the metering and fuel bowl have the correct gasket as it is not blocking the shot from the pump?

one thing that seems to happen over a long time with the diaphram in the pump is the material hardens....

alot of fixes...you gotta find out what is wrong with it first..
 
Went to a car show, everything worked fine, went to leave and pump was not working, maybe some dirt in the diaphram
 
I would say time for a rebuild... could be the diaphragm failed or the passage from the bowl to the main body could be clogged

ONLY use a Holley renew kit and Holley parts
 
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