ELECTRIC FUEL PUMPS

FURRY CONTACTS SU-type pumps that tick have contact breakers under their base cap. These can oxidise over lengthy idle periods . Clean them with fine wet-and-dry paper. Make sure the mechanism’s free to move, too.

STUCK VALVES Just like manual pumps, electric pumps have diaphragms and valves. Diaphragms can become porous or split and valves can stick. Solid disc valves can be prodded free. Be gentle with rubber valves.

INJECTION PUMPS If your pump is a high-pressure rotary type, first check the fuses and relay. Bridge the relay terminals to test. If that fails, try a direct 12V supply to the pump. It may be seized or electrically ‘dead’.