The mechanical lift pump that feeds the four-cylinder Ford diesel in the Super Major skid unit. It is driven off the engine and pushes fuel from the tank, through the filters, to the injection pump.
On a tractor that has stood for any length of time, the lift pump is one of the first things to let go: the diaphragm hardens, the non-return valves stick, and the whole fuel system needs draining and flushing before there is any point turning the engine over in anger.
Plan
- Drain and flush the tank, then check it for scale and water before refilling.
- Remove the pump, strip it, and assess the diaphragm, valves and body.
- Rebuild with a service kit if the casting is sound; source a replacement if it is not.
A hand-priming lever that has been worn smooth is usually a sign of an engine that has been hard to start for years — worth noting before blaming the injectors.
Related: county-super-4-front-drive-axle.