Test 3

If pressure measured in test 1 (see previous page) exceeds 3 bars proceed as follows: - disconnect fuel return pipe (at point (1) for connection to rigid fuel return line to pump) and place in a container suitable for collecting the fuel. - open cocks A and B; - operate the fuel pump with engine off as described on previous page, then take pressure reading off pressure gauge: a. if it reaches 3 bars replace the fuel return pipe to the tank because it is blocked or kinked; b. if it exceeds 3 bars replace the pressure regulator because it is defective.

Test 3

Checking injector seal

To check for drips from the injectors, connect as described in first test (regulation pressure check) and then operate the pump with the engine off. When the regulation pressure is reached, close control lever B and simultaneously constrict fuel return line to tank; use pliers for this purpose and avoid damaging the pipe. This operation is necessary to discriminate between true loss from the injectors and a faulty seal on the fuel pressure regulator runout valve. Then: - turn off the pump; - see whether pressure remains constant for 60 seconds after stabilising (i.e. dropping slightly). If it does not, one or more injectors or a fitting are leaking. - In this case, disconnect the fuel manifold from the intake manifold and keep the pressure gauge connected. - Repeat the previous test but leave the pressure gauge cock open. - After supplying the pump with the engine off, look to see whether any of the injectors or connection sections are dripping. Replace any dripping injectors and/or repair the defective seal in the leaking joint.