You need replace the fuel filter element every 50000 km (3100 mile) or once every two years.This illustration show you guide on how to remove and install fuel filter for ISUZU Euro 4 N-series truck with 4JJ1 engine.
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1.Remove the fuel in the element case.
Loosen the drain plug at the bottom of the element case.
Loosen the air removal plug on the filter body to remove the fuel.
2.Remove the harness connector from the element case.
3.Use a socket wrench 29 mm(1.15 in) to remove the element case.
4.Pull the element downward to remove the O-ring.
5.If foreign material has accumulated on inner surface of the filter body, wipe it with a clean cloth.
NOTE: Do not use an air blower to remove the foreign material. If you do, that foreign materials can be blown into the path on the clean side and cause failure of the supply pump.
1.Insert the O-ring into the groove on the outer circumference of the filter body.Do not let the O-ring get damaged by the threaded portion of the body.
2.Apply fuel to the gaskets inside and outside of the element, and insert the element until it reaches the end.
NOTE: Do not allow foreign materials to get into the four holes on the clean side next to the inner side gasket.
3.Apply fuel to the inner circumference of the element case or to the O-ring, and tighten clockwise until it reaches the filter body while preventing the O-ring from being caught.
If the element insertion does not reach the case, the element is not completely inserted. Press while turning the element again.
4.Install the element case, and tighten at the specified torque.
Tightening torque:56N.m(5.7kgm/41 lb-t)
5.Tighten the drain plug of the element case, and reconnect the connector of the water warning switch.
Tightening torque:0.4 N-m(0.04kg-m/3.5 lb-in)
6.After starting the engine, check each section for no looseness.