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Make sure of fuel leak when fuel pressure gauge is installed for low pressure fuel system. Make sure of fuel leak after reassembling fuel hose quick-connector.

Inadequate filtering can lead to damage at the pump components, delivery valves and injector nozzles. The fuel filter cleans the fuel before it reaches the high-pressure pump, and thereby prevents premature wear at the pump`s sensitive components. Inspect the inside of fuel system indirectly by checking water or foreign substances in the fuel filter.

Inspect the diesel fuel (foreign or metallic substances, water etc...from receiving diesel fuel in the beaker).

☞ Metallic substances could be found by magnetic.

Symptom

Inspection procedure

Case1

● There is a lot of water in the fuel filter.

● Inspect the poor fuel quality. (Inspect the customer`s gas station.)

● Inspect the damage of the fuel filler whether there is any accident. (If there is damage, water can be input to fuel line by rain, car washing.)

● Repair the fuel filter after cleaning the inside of the fuel tank and fuel line. (If there is a lot of water in the fuel tank.)

Case2

● There is a lot of metallic substances in the fuel filter.

● Inspect the poor fuel quality by checking the customer"s gas station. (High pressure fuel system would be damaged by poor lubricating performance.)

● Inspect the fuel temperature by checking operation of the FTS (Fuel Temperature Sensor) and Check driver`s driving habit (Vehicle is driven long time continuously or a lot of high load is applied).

● Replace the fuel filter after cleaning the inside of the fuel tank and fuel line. (If there is a lot of metallic substances in the fuel tank.)

☞ Go to "High pressure fuel system inspection" procedure.