# 3806857 Injection Pump Core | Genuine Volvo Penta Part

## 🔧 Product Description

Core deposit for an injection pump, in the Fuel System group. It is the refundable charge raised against the old injection pump when the exchange unit is bought, and it comes back once the worn injection pump is returned. The line itself is an accounting entry rather than a part, so nothing ships against it on its own. Under Volvo Penta's core numbering the exchange unit it belongs to takes part number 3803857, which is the number to quote for the component itself. Pump cores 3806797, 3806809 and 3806827 carry the same published weight of 28 kg as this one, and thirteen of the fifty-four injection pump cores listed here fall between 27.2 and 28.25 kg, about a kilogram covering the lot, so the published figure will not tell them apart; order the number that matches the pump actually coming off. That published weight is the figure to plan the return carriage of the old injection pump around, since the deposit itself ships nothing.

## ⚙️ Key Features

-   Core deposit line, not an injection pump you can fit
-   Belongs with the exchange unit, part number 3803857
-   Refunded when the old injection pump is returned
-   Same published weight as pump cores 3806797, 3806809 and 3806827, so order by part number
-   Fuel System group

## 🔌 Function

As a line item it carries the refundable core charge on the exchange; the pump itself meters the fuel, raises it to injection pressure and delivers the right quantity to each cylinder at the right moment, which is what governs how the engine starts, idles and pulls.

## ⚠️ Common Signs of Failure

-   This is a deposit line and has nothing to fail in itself; the signs below are what normally condemns the injection pump being exchanged
-   Long cranking or a refusal to start, worst from cold
-   Power and top revs down, with black smoke building under load
-   Hunting or surging at idle, or a knock that comes and goes as the engine warms
-   Diesel weeping from the pump body, its shaft seal or the delivery unions

## 🛠️ Service Notes

-   The charge is refunded when the worn injection pump is returned, so keep the old unit and send it back rather than scrapping it
-   Ordering this number on its own supplies no part - it goes on the order beside the exchange unit, part number 3803857
-   Find out what killed the old pump before the exchange unit goes on - water or dirt carried through from the tank will take the replacement out the same way, so renew the filters and prove the fuel clean first

## 📦 Condition

-   Refundable core deposit - not a physical part

## Details

- **Price:** 2530.0 AUD
- **Vendor:** Volvo Penta
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 2530.00 AUD | In stock |

## Images

- 3806857 Injection Pump Core | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/3806857-injection-pump-core-genuine-volvo-penta)
> Updated: 2026-08-22