Troubleshooting

7.Engine stops slowly or not at all

Cause

● The by-pass valve on the injection pump is blocked in the reverse direction

● Leakage in the system, leaking unions

● The electrical pull solenoid does not work

● Cable breakage and connector for fuel shut-off valve

● Plunger in fuel shut-off valve binds because dirt has got into the valve

–pre-filter missing

–fault occurs during commissioning. Dirt in tank installation not cleaned out after installation

● Faulty fuel shut-off valve

● The electrical pull solenoid is able to keep the solenoid pulled at very low voltages (applies to installations where the solenoid is live during operation).

Remedy

Change by-pass valve.

Check all hose and pipe unions are tight, including those which go to the fuel supply side of the tank via the pre-filter.

Check the pull solenoid current drain, which should be 1 A (24 V) or 2 A (12 V), or use an ohm meter to measure across pins 1 and 2 on the solenoid connector. Coil resistance should be between 8–30 Ω (0 Ω = short circuit, ∞Ω = open circuit).

Measure the valve connector, pins 1 and 2 with a multimeter at the same time as the stop is activated by the ignition key on the instrument panel.

Install a pre-filter.

Dismantle and clean dirt off the fuel shut-off valve. Clean the tank installation.

Please refer to Fuel shut-off valve, fault tracing, pages 95–97 for the fuel shut-off valve.

Use a voltmeter to check that there is no residual voltage on the electrical pulling winding of the valve during the stop operation

8.Engine is difficult to start

Cause

● Engine has not been vented properly. Air pocket left in injection pump even when engine has been in operation for some time.

● Faulty pressure valves

● Faulty fuel shut-off valve

● Pre-filter blocked by dirt

● Pressure drop on the fuel supply side so high that the pump is not able to suck up fuel

● Faulty working pressure in by-pass valve

Remedy

Vent engine at injection pump.

Check the injection system.

Please refer to Fuel shut-off valve, fault tracing, pages 95–97 for the fuel shut-off valve.

Change filter insert.

Measure the pressure drop before the fuel shut-off valve. Check for excessive lift height, fuel pipes too long or too narrow, dirt, and fix any faults.

Check the fuel pressure in the engine and change the by-pass valve as necessary.

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