How the DD15 Fuel Pump REALLY Works ⚙️ | Why Camshaft Failures Kill Engines Most drivers never realize this… On a Detroit DD15, the fuel pump isn’t electric — it’s mechanically driven by the camshaft. Inside the pump are rollers and pistons riding directly on the cam lobes. As the cam turns, those pistons compress fuel and send it to the injectors at extreme pressure. But that same pump also contains the low-pressure transfer pump that pulls fuel from the filters and feeds it back into the high-

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