11996309 Overflow Valve | Genuine Volvo Penta Part

🔧 Product Description

This is a genuine Volvo Penta overflow valve for the fuel system of TAMD, TWD, TAD and TD series diesel engines. Fitted in the fuel return circuit, it regulates fuel pressure and bleeds surplus fuel and entrained air back to the tank so the injection system receives a consistent, stable supply. A compact service item weighing approximately 0.10 kg.

🚤 Compatibility

• Engine Family: TWD, TAMD, TD, TAD
• Year Range: Approximately 1980s - 2000s

Full model list at the end of this description.

⚙️ Key Features

• OEM Volvo Penta part number 11996309
• System group: Fuel System
• Net weight approximately 0.104 kg
• Fits TAMD, TWD, TAD and TD series marine and industrial diesel engines
• Genuine Volvo Penta replacement component
• Engine type: Volvo Penta mechanical-injection inline diesel

🔌 Function

The overflow valve maintains correct fuel pressure in the injection circuit by opening once a set pressure is reached and returning excess fuel to the tank. In doing so it also helps carry away air trapped in the fuel system, protecting injection performance.

⚠️ Common Signs of Failure

• Hard starting or extended cranking due to loss of fuel system pressure
• Rough running, misfiring or power loss under load
• Fuel weeping or seepage at the valve body or its connections
• Air present in the fuel return line or repeated need to bleed the system
• Valve stuck open or closed, giving abnormally low or high fuel pressure readings

🛠️ Service Notes

• Treat it as a sealed, non-adjustable unit — renew it rather than attempting to clean, shim or adjust the internals
• Work clean: cap the openings, wipe the area down before opening the fuel system, and do not let dirt or fibres into the fuel side while the valve is off
• Renew the sealing washers, O-rings or gasket that come with the valve, and never reuse a crushed copper or aluminium washer
• Tighten to the figure in the workshop manual for your engine; these valves screw into fuel housings and heads that strip readily
• Bleed and prime the fuel system as the manual for your engine describes, then run the engine and check the joint for weeping under working pressure

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 1698287 recognised earlier / cross-reference valve number

OEM / Related Numbers

• 1698287 related reference
• 11996 related sealing gasket
• 11998401 related small parts kit
• 3826196 related injection pump

Aftermarket / Verified Equivalents

• SLP: ABV-309
• Aftermarket overflow-valve replacement: 1698287

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta TAMD74P-A, TAMD74P-B, TAMD74A, TAMD74C-A, TAMD74C-B, TAMD74L-A, TAMD74L-B
• Volvo Penta TAMD165A, TAMD165C, TAMD165P
• Volvo Penta TAD1030V, TAD1030VE
• Volvo Penta TAD1631GE, TAD1631G
• Volvo Penta TAMD122P-B, TAMD122P-C
• Volvo Penta TAMD72P-A, TAMD72WJ-A
• Volvo Penta TAMD73P-A, TAMD73WJ-A
• Volvo Penta TWD1230ME, TWD1230VE
• Volvo Penta TAMD163P-A
• Volvo Penta TAMD71B
• Volvo Penta TAMD75P-A
• Volvo Penta TD100G
• Volvo Penta TD1030VE
• Volvo Penta TD164KAE
• Volvo Penta TWD1030ME
• Volvo Penta TWD1031VE
• Volvo Penta TWD1231VE