Domed Cap Nut Fuel Pump and Fuel Rail. Porsche 911 / 924S / 928 / 944 / 968 / 964  ❭  92811047505

Domed Cap Nut – Fuel Pump & Fuel Rail Fixing M12 x 15,5

High-quality domed cap nut designed for securing components within the Porsche fuel system, including the fuel pump and fuel rail assemblies.

Used across a wide range of models including Porsche 924S, 944, 968, 928, and 964, this cap nut provides a secure fastening solution while protecting exposed threads with its domed design. It plays an important role in maintaining the integrity and safety of fuel system connections.

Fits:

• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 911 1978-1989 3.3L Turbo (930)
• 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
• Porsche 924S 2.5L 1986-87
• Porsche 924S 2.5L 1988
• Porsche 944 2.5L 8V 1982-87
• Porsche 944 2.7L 8V 1988-89
• Porsche 944S 2.5L 16V 1987-88
• Porsche 944S2 3.0L 16V 1989-91
• Porsche 944 Turbo 2.5L 8V 1985-88
• Porsche 944 Turbo 2.5L 8V 1989-91
• Porsche 944 Turbo S 2.5L 8V 1988
• Porsche 968 3.0L 1992-94
• Porsche 968 Sport 3.0L 1994-95
• Porsche 968 CS 3.0L 1993-95
• Porsche 968 Turbo S 3.0L 1993-94
• Porsche 928 4.5L 1978-82
• Porsche 928S 4.7L 1981-83
• Porsche 928S2 4.7L 1984-86
• Porsche 928S4 5.0L 1987-92
• Porsche 928GT 5.0L 1989-91
• Porsche 928GTS 5.4L 1992-95

Diagram ref no 38

Manufactured to OEM specifications, this component ensures precise fitment, corrosion resistance, and long-term durability—making it ideal for maintenance, repair, or restoration work.

Reference Number: 92811047505

Key Features

• Domed cap nut for fuel system applications
• Used on fuel pump and fuel rail assemblies
• Suitable for multiple Porsche models
• Protects threads while securing components
• OEM-style fit and finish
• Durable, corrosion-resistant construction

Function and Purpose

This cap nut is a key fastening component within the fuel system.

It helps to:

• Secure fuel pump and fuel rail components
• Protect threaded studs from damage and corrosion
• Maintain safe and stable fuel system assembly
• Ensure proper sealing and fastening integrity

Why Replace Cap Nuts

Over time, hardware components can degrade or become damaged.

Common issues include:

• Corrosion or rust
• Rounded or damaged threads
• Loss of proper torque retention
• Compromised fastening security

Replacing worn hardware ensures reliable and safe system assembly.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

92811047505

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