Restore precise fuel delivery to your heavy-duty truck or bus with the Standard Ignition Fuel Injector FJ643. This injector meters and sprays fuel into the engine on command from the engine management system, and it drops in as a direct-fit replacement across a wide range of medium- and heavy-duty applications, including the 1998-2002 Dodge Ram 2500 and Ram 3500, 1998-2001 Freightliner FL50/FL60/FL70/FL80 and MT45, 1998-1999 Kenworth T2000 and T300, 1999-2001 Peterbilt 379 and Sterling Truck L7500, plus Bering, Crane Carrier, El Dorado, Orion Bus, Ottawa, and Spartan Motors models.
- Function: Controls the metered flow of fuel into the engine as directed by the fuel/engine management system.
- Direct-fit replacement: Designed to install on the listed applications.
- Serviceable wear item: Replaces an original injector that has clogged, stuck, or begun leaking.
If a failed or clogged injector is the cause of rough idle, hard starting, a misfire, or poor fuel economy, this unit replaces it. Diagnose the underlying cause before replacing, since these symptoms can have other sources.
Interchange: Manufacturer part number FJ643.
Frequently Asked Questions
What does this fuel injector do?
It meters and delivers fuel into the engine on command from the fuel/engine management system, controlling how much fuel enters for combustion.
Which vehicles does the FJ643 fit?
It's a direct-fit replacement for many 1998-2002 medium- and heavy-duty trucks and buses, including Dodge Ram 2500/3500, Freightliner, Kenworth, Peterbilt, and Sterling. See the Buyer's Guide tab for the full list.
What are signs this injector may need replacing?
Rough idle, hard starting, a misfire, or poor fuel economy can indicate a clogged, stuck, or leaking injector. Diagnose the cause first, as these signs can have other sources.
Is this a direct-fit replacement?
Yes. It is designed to install on the listed applications. Confirm your specific year, make, model, and engine against the Buyer's Guide before ordering.
How many injectors do I need?
Most engines use one injector per cylinder, so the quantity needed varies by engine. This listing is for the injector as packaged; confirm your engine's requirement before ordering.
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