# 21265159 Fuel Hose | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine formed fuel hose used in the supply, return or leak-off system of Volvo Penta D12 marine diesel engines. It replaces earlier hose 3837665 and must follow the factory route to prevent heat, vibration and abrasion damage.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta D12C-A MP
-   Volvo Penta D12D-A MG
-   Volvo Penta D12D-A MH
-   Volvo Penta D12D-A MP
-   Volvo Penta D12D-B MH
-   Volvo Penta D12D-B MP
-   Volvo Penta D12D-C MH
-   Volvo Penta D12D-C MP
-   Volvo Penta D12D-D MP
-   Volvo Penta D12D-E MG
-   Volvo Penta D12D-E MH
-   Volvo Penta D12D-E MP
-   Volvo Penta D12D-F MP
-   Volvo Penta D12D-G MH
-   Volvo Penta D12D-G MP
-   Volvo Penta D12D-H MP

-   **Engine Family:** D

## ⚙️ Key Features

-   Current replacement for hose 3837665
-   D12 marine diesel fuel-system application
-   Factory hose length and connection geometry
-   Designed for diesel fuel, heat and engine vibration
-   Full model and serial confirmation required

## 🔌 Function

The hose transfers diesel fuel through the designated D12 supply, return or leak-off circuit while absorbing engine movement.

## ⚠️ Common Signs of Failure

-   Diesel leakage or fuel smell
-   Hose cracking, swelling or chafing
-   Restricted fuel flow and loss of power

## 🛠️ Service Notes

-   Renew the sealing washers, O-rings or seals that belong to the connection rather than reusing them, and do not put jointing compound on a fuel union to cure a weep
-   Fit the hose without twist, and support and clip it along its run so it cannot chafe or hang its own load on the end fittings
-   Keep the hose clear of hot exhaust and moving parts, and cap the open ends while working so nothing gets into the fuel system
-   Tighten unions to the figure given in the workshop manual for your engine — overtightening a fuel fitting distorts the seat and makes the leak permanent
-   Bleed the fuel system afterwards, then run the engine and check the whole run for weeps under working pressure, with no ignition sources near and a means of containing spilt fuel to hand

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   21265159 → Supersedes 3837665 → Supersedes 3826593

### OEM / Related Numbers

-   3837665 earlier number superseded by this part
-   3826593 earlier number superseded by this part
-   976971 - O-ring
-   3832768 - Related fuel hoses
-   3826591 - Related fuel hoses
-   25167 - Hollow screw
-   8148244 - Valve
-   965553 - Fuel-system brackets
-   965562 - Fuel-system brackets
-   965541 - Fuel-system brackets
-   3837245 - Fuel-system brackets

## 📦 Condition

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

## Details

- **Price:** 711.98 AUD
- **Vendor:** Volvo Penta
- **Type:** Hoses & Pipes
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 711.98 AUD | In stock |

## Images

- 21265159 Fuel Hose | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21265159-fuel-hose-genuine-volvo-penta)
> Updated: 2026-10-11