# 479690 Leak-Off Line | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta leak-off line from the Fuel System group, weighing 0.05 kg and listed for 8 applications across the TWD, THD, TD and DH series. It supersedes part number 978879, catalogued earlier as a tube.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta TWD1030ME
-   Volvo Penta TWD1031VE
-   Volvo Penta THD102KB
-   Volvo Penta THD102KD
-   Volvo Penta THD102K-KB
-   Volvo Penta TD100G
-   Volvo Penta TD1030VE
-   Volvo Penta DH10A

-   **Engine Family:** TWD, THD, TD, DH

## ⚙️ Key Features

-   0.05 kg
-   8 applications across the TWD, THD, TD and DH series
-   Supersedes 978879, formerly listed as a tube
-   Leak-off line 477901 is the other line in this range at 0.041 kg

## 🔌 Function

Returns the small volume of fuel that leaks past the injector needles back to the tank or return circuit.

## ⚠️ Common Signs of Failure

-   Diesel weeping around the injector tops or under the rocker cover
-   Fuel smell in the engine space after a run
-   Hard starting or rough running as air enters the return circuit
-   Line found cracked, hardened or chafed at a bend
-   Sealing washers at the connections found flattened

## 🛠️ Service Notes

-   Renew the sealing washers at every leak-off connection, as they are the usual source of the leak rather than the line itself
-   Leak-off line 477901 at 0.041 kg covers a different set of applications, so check the fitment before ordering

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   479690 → Supersedes 978879

### OEM / Related Numbers

-   978879 earlier number superseded by this part

## 📦 Condition

-   Genuine Volvo Penta part
-   Brand new
-   Supplied in original or equivalent packaging

## Details

- **Price:** 151.11 AUD
- **Vendor:** Volvo Penta
- **Type:** Hoses & Pipes
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 151.11 AUD | In stock |

## Images

- 479690 Leak-Off Line | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/479690-leak-off-line-genuine-volvo-penta)
> Updated: 2026-10-11