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- ENGINE - 7.3L DIRECT INJECTION DIESEL - "CACKLING" NOISE HEARD WITH ENGINE WARM AND SLIGHTLY ABOVE IDLE
- ENGINE - 7.3L DIRECT INJECTION DIESEL - "BUZZING" NOISE HEARD WITH KEY ON ENGINE OFF DURING FUEL PUMP CYCLING
| Publication Date: October 6, 2003 |
| 1999 SUPER DUTY F SERIES |
Article 98-17-16 is being republished in its entirety as part of a consolidated 7.3L diagnostic aid booklet.
A "cackling" noise with the engine warm and slightly above idle, and/or a "buzzing" noise from the fuel pressure regulator with Key On Engine Off (KOEO) during fuel pump cycling, may occur on some vehicles. These may be caused by low fuel pressure due to the fuel pressure regulator seal (O-ring) splitting.
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