Discovery 1 Fuel Pumps
The fuel pump fitted to both carb and efi petrol engine Discovery models is located inside the fuel tank and is integral with the fuel level sender unit.
However, the fuel pumps are not interchangeable, as carburettor engines have a low pressure pump and efi vehicles a high pressure item. The difference between the two is visible from the outside: Low pressure pumps have a yellow locking ring and high pressure, a red one.
Discovery's fitted with the Tdi engine have a conventional, engine-mounted, mechanical lift pump.