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Where is the fuel filter on a semi truck?

Updated: 10/22/2022
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10y ago

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Depends on make, model, and year of the engine. Pre-SCR Cummins ISX engines have two suspended canister filters on the left side, with the secondary being threaded onto a housing inside of the frame rail, while the primary is further back and outside of the frame rail. SCRCummins engines will have a secondary fuel filter in a location near to where it is on the pre-SCR engines, while the primary is typically a fuel/water separator - normally of the Davco type, but a proprietary type may also be used (such as the PACCAR fuel/water separator) towards the firewall and outside of the frame rail on the left side of the engine. Earlier models of the PACCAR MX use a similar setup to SCR-equipped Cummins ISX engines, although the new models have internal fuel filters on the left side of the engine. Volvo engines have the secondary fuel filter below and on the left side of the engine, while the fuel/water separator may be either of the Davco type, and located towards the engine on the right side of the truck, or a proprietary type located immediately behind the secondary fuel filter.
Just a couple examples.

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Q: Where is the fuel filter on a semi truck?
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