been running my 59 (55 motor) out of a gas can while I restored the tank. Ran all day long. Put the tank in today ran about 2 min shut off now it seems the pump quit working. Took it off bench tested with a vaccum gauge and I get about 3 psi pumping it by hand, put it on the motor and I only have 1/2 psi. I thought the tube in the tank may have been clogged, but I doubled checked that it was fine, even retested with all that disconnected and still only have 1/2 psi. Could the lobe on the cam be worn that much or the arm on the pump?