D439E Service Manual 4. Fuel system
149
Fuel Tank and Fuel Line
Troubles Possible causes Corrective actions
Fuel pipe is twisted or broken Repair or replace.
Fuel pipe or hose is clogged Clean or replace.
Fuel filter is clogged Replace.
Water intrudes into fuel filter.
Replace fuel filter or clean fuel
tank or fuel line.
Foreign materials intrude in fuel
tank.
Fuel tank is corroded.
Clean or replace.
Poor engine performance due to
insufficient fuel supply
Defective supply pump operation Replace assembly.
Fuel filter warning lamp blinks. Excessive water is in fuel filter.
Drain the water collected in the
fuel filter. (Loosen the drain plug
at the bottom of fuel filter.)
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