Fuel tank gauge O-Ring. Porsche 964 / 993  ❭  99970711540

Fuel Tank Level Sender Seal 

Maintain the integrity of your Porsche fuel system with this OE Match Fuel Tank Level Sender Seal for Porsche 964 and Porsche 993 models. This essential sealing gasket sits between the fuel tank and the fuel level sender unit, creating a fuel-tight seal that prevents leaks, fuel vapour escape and contamination from entering the tank.

Fits:

• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93
• Porsche 964 (911) TURBO 3.3L 1991-93
• Porsche 964 (911) TURBO 3.6L 1991-93
• Porsche 993 (911) C2 1994-97
• Porsche 993 (911) C4 1994-97
• Porsche 993 (911) RS 1994-97
• Porsche 993 (911) C2S 1994-97
• Porsche 993 (911) C4S 1994-97
• Porsche 993 (911) TURBO 1994-96
• Porsche 993 (911) GT2 1994-97
• Porsche 993 (911) TURBO S 1994-97

Although small and inexpensive, the fuel tank level sender seal plays a vital role in the safe and reliable operation of the fuel system. Over time, the original seal can harden, shrink or deteriorate due to constant exposure to fuel, heat and age, increasing the risk of fuel leaks and fuel odours inside the vehicle.

Manufactured to OE Match specifications, this replacement seal provides the correct fit and sealing performance for maintenance, fuel sender replacement and restoration projects.

What Does the Fuel Tank Level Sender Seal Do?

The fuel level sender seal creates a secure seal between the fuel tank and the fuel level sender assembly.

Its primary functions include:

• Preventing fuel leaks
• Sealing fuel vapours inside the tank
• Protecting against contamination
• Maintaining fuel system integrity
• Supporting accurate fuel sender operation
• Reducing fuel odours
• Helping maintain vehicle safety

Without a properly functioning seal, fuel and vapour can escape from the sender mounting area.

Why Do Fuel Tank Level Sender Seals Fail?

Fuel system seals operate in a harsh environment and are constantly exposed to fuel and temperature changes.

Common causes of failure include:

• Age-related hardening
• Fuel exposure
• Ethanol-blended fuel degradation
• Heat cycling
• Compression fatigue
• Shrinkage over time
• Incorrect installation
• Disturbance during sender removal

After many years of service, even an original seal that appears intact may no longer provide an effective seal.

Symptoms of a Failing Fuel Sender Seal

Common warning signs include:

• Fuel smell inside or around the vehicle
• Dampness around the sender unit
• Visible fuel seepage
• Fuel stains near the sender mounting area
• Vapour leaks
• Deteriorated or flattened seal
• Leaks after sender replacement

These symptoms should never be ignored, as fuel leaks present both safety and reliability concerns.

When Should the Fuel Tank Level Sender Seal Be Replaced?

Replacement is recommended when:

• Removing the fuel level sender
• Replacing the fuel sender unit
• Servicing the fuel tank
• Fuel odours are present
• Fuel leaks are discovered
• Carrying out preventative maintenance
• Restoring a Porsche 964 or 993
• The original seal shows signs of ageing

Most Porsche specialists recommend replacing the seal whenever the sender unit is removed.

Why Replacement Matters

Replacing an ageing sender seal helps protect the fuel system and vehicle.

Benefits include:

• Prevention of fuel leaks
• Reduced fuel vapour escape
• Improved safety
• Protection against contamination
• Elimination of fuel smells
• Reliable fuel system sealing
• Low-cost preventative maintenance
• Long-term peace of mind

For such an inexpensive component, replacing the seal can prevent far more costly repairs and fuel system issues.