Electric Fuel Pump: Electrical Connections
Terminals 1 and 2 are the pump-coil connections. The 2 BA tag is connected to the terminal stud and the 5 BA tag goes under the rocker blade securing screw. Terminal 3 is the earth connection from the points and goes under the pedestal securing screw to be earthed via the pump body to the car chassis.
Many pumps have been supplied with diodes as original equipment: these are polarity conscious and must be fitted correctly. Where fitted, one terminal of the diode is connected to the terminal stud and the other under the rocker blade securing screw. The diode's terminals are the means of polarity identification.
Where capacitors are fitted they are connected across the points. ie one terminal to terminal 3 and the other to the rocker blade securing screw. They are not polarity conscious. Where varistors are fitted they are connected the same as capacitors but they are not polarity conscious.