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Q & A: Inconsistant Fuel Pump

Working on a 1958 MGA I discovered it's fuel pump had stopped pumping (no clicking noise). Checking the terminal connection with a test light showed power is being supplied when the key is on. Checking with a voltmeter showed 12 volts supplied. I also noticed that when the key was turned on, and again a second or two after the key was turned off, there was an audible click from the pump. I removed the pump and connected it to a 12 volt source (positive to case and negative to terminal) and the pump ran. The pump was in the vertical position at this time and it pumped out what fuel it still contained without any problem. I noticed however that when the pump ran it would occasionally pause, like something was sticking, then restart. These pauses were of various time lengths and seemingly without any pattern, nor did it matter if the pump was vertical or horizontal. Does this need an electrical rebuild and is there a kit for these pumps or is a replacement unit needed? What are the costs? This pump does not have the red tape around the motor that I've heard means a dual polarity pump but it does have the stepped cap over the points that I think indicates a high volume unit.

There are two possibilities: Faulty Points - or - blocked fuel tank.

If the tank is blocked -- if the pickup line is plugged, then the pump will not cycle but get hot. You can tell quickly if the pickup line is open -- either i... read more