⚠️ Is your DD15 surge idling, hunting at idle, or throwing rail pressure codes? This video explains one of the most overlooked failure points inside the DD15 fuel system — the Quantity Control Valve (QCV) — and how it can quietly turn into a full fuel-system meltdown. On a DD15, the QCV controls how much fuel enters the high-pressure pump. When this valve sticks or glitches, the pump becomes starved and begins to cavitate. That cavitation causes internal metal wear that spreads through the fuel
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⚠️ Is your DD15 surge idling, hunting at idle, or throwing rail pre…
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