3804520 Unit Injector Core | Genuine Volvo Penta Part

🔧 Product Description

Refundable core deposit raised against the exchange unit injector on Volvo Penta part number 3801520, listed under Fuel System. It is an accounting line rather than a fittable part: the charge goes on when the exchange unit injector is supplied and comes back off when the old unit injector is returned, and nothing is shipped against the deposit itself. Unit injector deposit 3804482 is the other one in this part of the block and the record does not separate the two, so order against the injector's own number.

⚙️ Key Features

• Refundable core deposit, not a fittable part
• Paired unit number 3801520
• Nothing ships against this line
• Credited back when the old unit injector is returned
• Listed under Fuel System

🔌 Function

Carries the refundable core charge on the outgoing unit injector rather than doing any mechanical work itself. A unit injector pressurises and meters the fuel for one cylinder within a single camshaft-driven body.

⚠️ 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
• Rough idle or a misfire that stays on one cylinder
• White or black smoke, a knock from that cylinder and fuel consumption up
• Hard starting, particularly from cold, and a cylinder balance reading out of line
• A carbon-tracked or leaking nozzle and a poor spray pattern when the injector is put on test

🛠️ Service Notes

• The charge is credited back once the old unit injector is returned through the dealer; it has to go back complete and rebuildable, and a stripped, cracked or seized-solid unit injector can be refused or the credit cut.
• Ordering this number on its own supplies no part. It only makes sense raised alongside exchange unit 3801520, so confirm that unit is obtainable and check its exact designation before quoting.
• Injectors are usually condemned in sets, so check whether the other cylinders are going the same way before raising one deposit on its own.

📦 Condition

• Refundable core deposit - not a physical part