Fuel System

The fuel system in your conversion can be simplified as shown in the diagrams below. The inline pump used is the same as the inline pump in the donor vehicle. If you do not have any major restrictions, then this pump is happy sucking fuel from a tank and does not require a regulator. We recommend genuine pumps and supply them in our shop.

M57 184/193

This fuel circuit contains the original filter with the pressure sensor which should be connected.

M57N

Later engines with solenoid injectors are only slightly different, they just use an inline filter rather than one with a pressure sensor:

M57N2

Engines with piezo injectors need the correct back pressure on the injector spill line. Although not everybody fits one, we find the piezo engines start better with 3 bar of back pressure in the return line, the restrictor we fit is available: Click here

Note that the injector spill line is connected to the main fuel feed. The injector spill line also contains a factory fitted restrictor.