C7 Industrial Engine Operation and Maintenance Manual – Fuel System Secondary Filter – Replace

  1. Stop the engine. Turn the ignition switch to the OFF position or disconnect the battery. Refer to the Operation and Maintenance Manual, “Battery or Battery Cable – Disconnect” topic (Maintenance Section) for more information. Shut off the fuel supply valve (if equipped).


  1. Clean the outside of the fuel filter. Remove the used fuel filter and discard the used fuel filter.


  1. Clean the gasket sealing surface of the fuel filter base. Ensure that all of the old gasket is completely removed.


In order to meet expected fuel system component life, 4 micron(c) absolute or less secondary fuel filtration is required for all Caterpillar Diesel Engines that are equipped with unit injected fuel systems. Note that all current Caterpillar Diesel Engines are factory equipped with Caterpillar Advanced Efficiency 4 micron(c) absolute fuel filters.

Caterpillar does not warrant the quality or performance of non-Caterpillar fluids and filters.


Do not fill the secondary fuel filter with fuel before installing. The fuel would not be filtered and could be contaminated. Contaminated fuel will cause accelerated wear to fuel system parts.


  1. Apply clean diesel fuel to the gasket that is located on the new fuel filter.


  1. Install the new fuel filter. Spin the fuel filter onto the fuel filter base until the gasket contacts the base. Instructions for the installation of the filter are printed on the side of each Caterpillar spin-on filter. For non-Caterpillar filters, refer to the installation instructions that are provided by the supplier of the filter.


  1. Open the fuel supply valve. Prime the fuel system. Refer to the Operation and Maintenance Manual, “Fuel System – Prime” topic (Maintenance Section) for more information.


  1. Turn on the ignition or reconnect the battery cable. Start the engine and inspect the fuel system for leaks.


Do not crank the engine continuously for more than 30 seconds. Allow the starting motor to cool for two minutes before cranking the engine again.

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