Fuel Injectors for 1999–2007 Ford E-350 Super Duty

How long do fuel injectors last in a Ford E-350 Super Duty?

Expect 100,000 to 140,000 miles on the 5.4L V8 and slightly less on the 6.8L V10 due to the extra injectors and higher heat load. Vans used for idling—service trucks, mobile workshops—will see failures closer to 80,000 miles. Fleet vans that ran biodiesel blends sometimes fail earlier due to seal degradation. Highway-driven passenger vans with regular fuel filter changes can push past 150,000 miles before needing replacement.

Can I replace E-350 fuel injectors myself or should I take it to a shop?

The 5.4L V8 is straightforward if you've done spark plugs before. Remove the intake plenum, disconnect the fuel rail, and swap them out. Budget three hours. The 6.8L V10 is tighter—injectors 9 and 10 sit deep under the intake manifold. You'll need a fuel line disconnect tool and injector puller. If you're not comfortable depressurizing the fuel system or dealing with ten electrical connectors, a shop will charge $600-900 in labor depending on V8 or V10.

What are the most common symptoms of bad injectors on the Triton engines?

Lean codes P0171 and P0174 show up first, usually from clogged injectors not delivering enough fuel. You'll notice rough idle that smooths out above 1500 RPM. Random misfires follow—P0300 with occasional P030X codes. The engine stumbles during acceleration or bogs down under load. Cold starts are fine, but hot restarts take extra cranking. On the V10 specifically, you might see a fuel smell near the back of the intake manifold where injectors 9 and 10 sit.

Do E-350 injectors have any known issues specific to these years?

The injector O-rings dry out and crack, especially on vans that sat unused for weeks at a time. This causes vacuum leaks and fuel seepage. The electrical connectors corrode internally—common on work vans exposed to weather. You won't see it until you pull the connector apart and find green powder. Also, these injectors carbon up fast if the van idled heavily. Commercial fleets running 87 octane for cost savings saw worse buildup than vans running 89 or higher.