Fuel Supply Line: Description and Operation

Fuel is drawn by the pumps from the fuel tank and is then supplied to the fuel rail via a 70 micron filter and the fuel feed line connected in series by fuel filter.

The fuel lines are made up of an assembly, combining steel under floor pipes and flexible conductive anti-permeation tubing. In order to perform speedy remove and refit operations, the underfloor steel lines are linked through the engine bay bulkhead to the flexible tubing, leading to the fuel rail and the fuel regulator by using positive sealing, quick-fit type connectors. The same type connectors, are used to connect the fuel feed and return line to the fuel tank.

Connectors used inside the engine bay are of different sizes to correspond with the difference in pipe diameter, whereas the connectors for the feed and return lines at the fuel tank are the same size.

Except for the return line connector at the fuel tank, two release tools, one for each size of connector are required to release all remaining connectors.





The connectors are released by pushing the tool into the female half of the connector and at the same time disengaging the latches.

Viton hosing surrounds the tubing, thus preventing any potential damage from fire and other matters.

The conductive anti-permeation tubing does not return to its original shape after being deformed. Therefore do not clamp (eg. for sealing purposes prior to disconnection of tubes) as this damages the fuel pipes.

Fuel Lines On Engine:

On USA Sedans with the twin canister evaporative loss control system, revised fuel lines are introduced in the engine compartment.

The fuel lines are changed to P-CAP tubing to reduce evaporative losses through the fuel line walls. A fire resistant rubber sleeve is installed over the P-CAP. Pulse dampers are introduced to both the supply and return fuel lines. The pulse dampers absorb the pressure pulses produced by fuel injector operation, to prevent knocking sounds in the semi-rigid fuel lines.