One problem related to oil pump has been reported for the 2005 Ford F-550. The most recently reported issues are listed below.
The contact owns a 2005 Ford F-550. The contact stated that while driving 55 mph, the vehicle misfired, hesitated, and stalled with the illumination of the maintenance light. The failure recurred over the course of 7 years. The vehicle was towed to the dealer for diagnosis on several occasions where it was stated that the injectors, oil pump, intake gasket, crank shift, and engine needed to be replaced. The vehicle was repaired but the problem persisted. The manufacturer was notified. The approximate failure mileage was 30,000.