# 3803720 Injection Pump | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta remanufactured injection pump weighing 27 kg, recorded against 18 applications across the TWD, TD and TAD series, and superseding 865851. The reman catalogue lists this number against TD121G-87, TWD1210/1211/1230V, TWD1230VE, TWD1231VE, TD121GP-87, TWD121P, TWD1211P and TAD1230P, and qualifies the TD121G-87 entry as being for engines from serial number 38632 onwards. At 27 kg it sits close to 3803740 at 27.4 kg and 3803797 at 28 kg, so the serial qualification and the superseded number identify it rather than the weight. Supplied on exchange: core deposit 3806720 is charged alongside it and refunded once the old pump is returned.

## ⚙️ Key Features

-   Remanufactured injection pump
-   27 kg
-   TD121G-87 engines from serial number 38632 onwards
-   Also listed for TWD1210/1211/1230V, TWD1230VE, TWD1231VE, TD121GP-87, TWD121P, TWD1211P and TAD1230P
-   Supersedes 865851

## 🔌 Function

Raises fuel to injection pressure and meters the right quantity to each cylinder in firing order, setting the engine's power and speed.

## ⚠️ Common Signs of Failure

-   Hard starting, or long cranking before it fires
-   Power down, with a flat spot as the throttle is opened
-   Black smoke and uneven running at idle
-   Engine speed hunting or surging
-   Diesel weeping from the pump body or the drive-end seal

## 🛠️ Service Notes

-   On a TD121G-87 read the engine serial number first - this pump covers engines from 38632 onwards and the earlier engines are listed elsewhere
-   If the engine's list shows 865851, this is the current number
-   Have the pump timed and its fuel settings checked on fitting; core deposit 3806720 is refunded when the core goes back

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   3803720 → Supersedes 865851 → Supersedes 3825272

### OEM / Related Numbers

-   865851 earlier number superseded by this part
-   3825272 earlier number superseded by this part

## 📦 Condition

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

## Details

- **Price:** 13943.22 AUD
- **Vendor:** Volvo Penta
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 13943.22 AUD | In stock |

## Images

- 3803720 Injection Pump | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/3803720-injection-pump-genuine-volvo-penta)
> Updated: 2026-08-22