Bosch WHT-005-302 Fuel Injector O-Ring Upper Seal

The Bosch WHT-005-302 is a genuine OEM upper fuel injector O-ring designed to create a leak-proof seal between the fuel injector and fuel rail. This precision-engineered seal is critical for maintaining proper fuel system pressure and preventing dangerous fuel leaks in the engine bay.

Key Features:

• Genuine Volkswagen/Bosch OEM quality for reliable fitment and performance
• Upper position O-ring seals against pressurized fuel at the fuel rail connection
• Manufactured from fuel-resistant elastomer materials engineered to withstand gasoline, ethanol blends, and extreme temperatures
• Prevents fuel leaks, loss of fuel pressure, and fire hazards
• Also known as Seal Ring in VW parts diagrams
• Single O-ring (sold individually)

Why Replacement is Critical:

Fuel injector O-rings degrade over time due to constant exposure to fuel additives, heat cycles, and engine vibration. Failed upper O-rings allow pressurized fuel to leak from the fuel rail connection, creating fuel odor, hard starting conditions, loss of fuel pressure, and serious fire risk from fuel dripping onto hot engine components. Always replace fuel injector O-rings when removing injectors for service or when any signs of leaking are present.

Installation Notes:

O-rings should never be reused once removed. Clean all sealing surfaces thoroughly before installation. Lightly lubricate the new O-ring with fuel-compatible lubricant and ensure it seats properly in the injector groove. Avoid using any metal tools during installation to prevent seal damage.