FF5488 Fuel Filter Assembly

Cast-head fuel assembly role

Some Cummins ISX fuel modules use a heavy assembly with a machined head and a serviceable filter element rather than a lightweight spin-on alone. Fleetguard lists this fuel filter assembly for tractors where that architecture protects injectors from pump wear debris and tank contamination. The assembly mass reflects metal head structure and hardware, not merely filter media volume.

Price on this card is $89.99 USD before tax. Published weight is 4.8 lb, so parcel versus freight classification may differ from small spin-on orders. Review the shipping policy when you are bundling several cast-head units for a regional shop.

This page describes fuel filtration ahead of the high-pressure system. It is not a crankcase lube filter and not a fuel/water separator bowl with a drain petcock unless your module integrates those functions at the OEM level.

Why fleets choose the assembly format

Cast heads spread clamp loads evenly and give technicians a stable sealing surface after years of heat cycles. When a fleet runs Freightliner, Peterbilt, and Kenworth tractors with Cummins ISX power, standardized fuel hardware reduces training time: the same tightening pattern, the same leak check points, the same priming discipline.

Injector repairs are expensive enough that many shops treat fuel assemblies as hard PM, not as run-to-failure items. Restriction gauges, idle quality, and hot restart behavior still matter, but the assembly swap also refreshes seals and threads that live in a vibration-heavy bay.

Freightliner, Peterbilt, Kenworth with ISX

The fitment summary on this listing covers Freightliner, Peterbilt, and Kenworth applications carrying Cummins ISX engines. Exact model years and fuel module variants appear in the table above this prose block. Use that table as a starting map only.

Match the stamp on the removed head or filter element, engine serial, and VIN-derived build data before you install. Repowers, updates, and regional spec changes can leave a Cascadia badge on a truck whose fuel head differs from a sister unit. We cannot guarantee fit from model names alone.

Unclear photos go to support@aonetruckauto.com with the VIN and engine serial when available. Include shots of casting marks, port orientation, and the old part number label. The fitment guide helps when you are deciding between this assembly and a lighter spin-on from another listing.

Stamp verification habit

Technicians should read the Fleetguard marking on the core or box label and compare it to the order line before the old head comes off the frame. If your purchase order references FF5488, confirm the casting and port layout still match the truck in the bay.

Protecting injectors and pump supply

ISX fuel systems tolerate little abrasive flow. The assembly’s job is to keep hard particles away from close-tolerance pump components and injector bodies. Water separation, if required on your module, may happen in a separate bowl upstream—do not assume this assembly replaces a dedicated water drain service when the chassis uses a separator canister.

Symptoms of a loaded fuel path include power fade under sustained grade, rough idle after hot soak, and lamps related to supply pressure. Document restriction before swap when gauges exist so you can prove improvement after priming.

• Replace sealing rings that show flat spots or heat embrittlement during every service.
• Inspect standpipes and threads for galling before you torque the new head.
• Keep dirt out of open ports with clean caps during the swap.

Handling weight in the shop

At 4.8 lb shipped weight, the carton is still manageable for one technician but awkward on a ladder at the frame rail. Use a cart or second set of hands when you are aligning a cast head with multiple ports. Drop damage can crack casting porosity that leaks only under hot fuel pressure.

Receiving should note freight dents on corners. If the head face shows impact marks, photograph before install and contact support while the package is still traceable to the carrier.

Priming and leak check discipline

Install using the engine maker procedure for ISX fuel modules on your VIN. Priming may require multiple key cycles, a shop manual lift pump, or approved priming tools—follow the chart rather than guessing from memory on a different fleet unit.

After assembly, pressurize the supply side and inspect every joint at idle and after a short road load. Fuel leaks at highway vibration find weak threads quickly. Clear codes only after stable operation is confirmed.

Commercial ordering

SKU FLG-FF5488 identifies this listing in cart and PayPal totals. Multiply $89.99 by the quantity you need; tax follows your ship-to rules. For bulk regional orders, email support with VIN lists rather than assuming every ISX module year uses the same head casting.

Opened or installed fuel assemblies may be restricted under returns and refunds. Read that page before you break seals on a speculative stocking order.

Independent seller context

We sell replacement filtration for technician-led maintenance programs. Brand names on the truck and filter describe compatibility language for matching parts in a crowded catalog.

Cast-head leak paths after heat

Recheck head joints after the first loaded heat cycle. Cast assemblies that look dry at cold idle can weep once fuel softens aged O-rings you reused by habit.

Standpipe galling during removal is a reason to inspect threads before torquing the new head — chasing damaged threads with a new assembly wastes another afternoon.

See the shipping policy for parcel versus freight handling. Opened or installed goods follow returns and refunds. Email support@aonetruckauto.com with VIN and stamp photos.

Sold by HEAVY TRUCK PARTS, INC. in Florida. Fitment table names are for matching parts, not OEM endorsement.