Thump/whine/knock noise from the fuel tank at idle or during key on, engine off (KOEO). The noise may be...
Ford technical service bulletin TSB 21-2057 for 2020-2021 Ford F-250 SD, 2020-2021 Ford F-350 SD and 2020-2021 Ford F-450 SD and others.
- Bulletin number
- TSB 21-2057
- Component
- Fuel system, gasoline
- Summary
- Some 2020-2021 F-Super Duty vehicles equipped with a 6.7L engine built on or before 10-Feb-2021 may exhibit a thump/whine/knock noise from the fuel tank at idle or during key on, engine off (KOEO). The noise may be more pronounced at fuel levels at or below 1/4 tank. This may be due to the fuel pump strategy in the powertrain control module (PCM) software. To correct the condition, follow the Service Procedure to reprogram the PCM.
Vehicles covered
- Ford F-250 SD 2020-2021 20202021
- Ford F-350 SD 2020-2021 20202021
- Ford F-450 SD 2020-2021 20202021
- Ford F-550 SD 2020-2021 20202021
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