Fuel pressure regulator

Fuel pressure regulator

The pressure regulator is a mechanical device mounted on one end of the fuel rail. Pressure is controlled by diaphragm spring pressure and modified by the vacuum signal. The regulator ensures that fuel rail pressure is maintained at a constant pressure difference to that in the inlet manifold, as manifold depression increases the regulated fuel pressure is reduced in direct proportion.

When pressure exceeds the regulator setting, excess fuel is returned to the fuel tank swirl pot which contains the fuel pump pick-up.

Inertia fuel shut-off switch

The electrical circuit for the fuel pump incorporates an inertia switch which, in the event of a sudden deceleration, breaks the circuit to the fuel pump preventing fuel being delivered to the engine. The switch is situated next to the ECM and can be reset by pressing the rubber top.

WARNING: ALWAYS check for fuel leaks and the integrity of fuel system connections before resetting the switch.