Fuel Injector Inner Bush. Porsche 914-4 / 928  ❭  311133261A

Fuel Injector Locating Bush Inner – Injector Mounting O-Ring & Vibration Damper
Sold each

High-quality fuel injector locating bush designed for Porsche 928S models with engines M28.19, M28.20, M28.21, and M28.22, and also used in various other applications including select Mercedes models.

Fits:

• Porsche 928S 4.7L 1981-83
• Porsche 928S2 4.7L 1984-86
• Porsche 914-4 (1970-1976)

Diagram ref no 27

This component is mounted over the fuel injector and functions as both a locating bearing and vibration-damping O-ring. It ensures the injector is correctly positioned while reducing movement and absorbing vibration within the fuel system.

Manufactured from durable rubber material, this locating bush is engineered to withstand fuel system conditions, heat, and long-term use while maintaining flexibility and sealing performance.

A direct replacement part, this injector locating inner bush is essential for maintaining proper injector alignment, reducing vibration, and ensuring reliable fuel delivery.

Key Features

• Direct replacement fuel injector inner locating bush / O-ring
• Suitable for Porsche 928S (M28.19 / M28.20 / M28.21 / M28.22)
• Also used in various compatible vehicle applications (including Mercedes)
• Provides injector positioning and vibration damping
• Durable rubber construction for long-term performance
• OEM-style fit and function

Function and Purpose

This locating bush acts as both a positioning guide and vibration damper for the fuel injector.

It helps to:

• Secure the injector in its correct position
• Absorb vibration within the fuel system
• Improve sealing and stability
• Support consistent fuel delivery and injector performance

Why Replace Your Injector Locating Bush

Over time, rubber sealing and damping components can degrade.

Common issues include:

• Hardened or cracked rubber
• Loss of elasticity and damping ability
• Poor injector seating or movement
• Fuel system vibration or instability

Replacing the locating bush restores proper injector fitment and improves overall system performance.

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Related, superseded, cross reference or alternative numbers for comparison.

311133261A

The product you are viewing cross references to these numbers