3rd Test

If in the 1st test (see previous page) the pressure value was more than three bar it is necessary to: - disconnect the fuel return pipe (at the connection point (1) with the rigid fuel return pipe to the electric pump) and place it in a suitable container for collecting the fuel. - place both taps A and B in the open position; - operate the electric pump with the engine switched off, as described on the previous page, then read off the value reached on the pressure gauge: a. if it reaches 3 bar, check the fuel return pipe to the tank because it is obstructed or bent; b. if it exceeds 3 bar, then the pressure regulator must be replaced because it is defective.

3rd Test

Checking injectors seal

To check whether the injectors are dripping, simply implement the connections for the 1st test (checking regulation pressure), then operate the electric pump with the engine switched off. When the regulation pressure is reached, close the control lever B and, at the same time, restrict the fuel return pipe to the tank; a pair of pliers should be used so as not to damage the pipe. This operation is necessary to distinguish between a real leak from the injectors and the imperfect seal of the fuel pressure regulator flow valve. Then: - switch off the electric pump; - observe whether the pressure remains constant for around 60 seconds as soon as it stabilizes (i.e. decreases slightly). If this is not the case, there is a leak from one or more injector or from a union. - If this is the case, remove the fuel manifold from the inlet manifold, keeping the connection with the pressure guage. - Repeat the previous test leaving the pressure gauge tap open. - After having operated the electric pump with the engine switched off, visually inspect for drips from the injectors or from any connecting sections. Replace any injector which is dripping and/or renew the defective seal which is leaking.