Join Date: Feb 2001
Location: Kansas City, MO
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Re: Zook mechanical fuel pump woes
If you blow compressed air into the system, you are liable to damage the diaphram!
A better test would be to connect a resevoir to the input of the pump (removed from the head) through a fuel line, fill it with gasoline and allow it to gravity-fill the pump. Examine the back side of the pump along with the vent tube for signs of leaking gasoline.
Since there is no "factory spec" for an electric pump conversion, you will need to buy a regulator (NAPA has one) and after installing it on the output on the pump, start with a setting of 1 PSI. Adjust it up until you have enough pressure to feed the carb without applying too much pressure to the float valve on the carburetor.
As mentioned above, you must remove the push-rod before installing a plate over the pump mount opening. Fabbing one yourself should be simple.