3804391 Unit Injector Core | Genuine Volvo Penta Part

🔧 Product Description

Core deposit line for a unit injector, held in the Fuel System group. The line exists to hold the refundable charge on the old unit injector being handed back against an exchange unit; no hardware moves against it. Its pair is part 3801391, which is where the unit injector comes from.

⚙️ Key Features

• A deposit line, not a shippable part
• Refunded on return of the old unit injector
• Pairs with part 3801391

🔌 Function

Holds the refundable core charge against an exchange unit injector and releases it once the old unit injector is returned.

⚠️ Common Signs of Failure

• This is a deposit line and has nothing to fail in itself; the signs below are what normally condemns the unit injector being exchanged
• Plunger and barrel worn, so the unit no longer builds the injection pressure it should
• Nozzle tip coked or eroded and the spray pattern broken up
• Fuel found in the oil, or the rocker cover area wet where the unit seals into the head
• One cylinder misfiring, with a sharper knock from that position than the others

🛠️ Service Notes

• The charge on this line is refunded on return of the old unit injector.
• Ordering this number on its own supplies no part - the unit injector comes from its paired line, part 3801391.

📦 Condition

• Refundable core deposit - not a physical part