Fuel filler neck sleeve. Porsche 356  ›  64420117700

The OE Match Fuel Filler Neck Sleeve is a replacement rubber collar for the fuel filler assembly of late Porsche 356 B T6 and Porsche 356 C models.

• Porsche 356 B T6 / 356 C 1.6 08/62-12/65

Positioned around the fuel filler neck, the sleeve helps provide a neat, protected interface between the filler neck and the surrounding body and fuel-tank installation. Its flexible construction cushions the filler neck, closes the surrounding gap and helps protect adjacent components from contact, dirt and moisture.

On a classic Porsche, the original rubber component may have been exposed to decades of fuel vapour, temperature changes, moisture and ageing. Over time, the material can become hard, cracked, shrunken or brittle, making replacement worthwhile during fuel-system refurbishment or restoration.

What This Product Does:

• Fits around the fuel filler neck.
• Provides a protective collar between the filler neck and surrounding structure.
• Helps close the gap around the filler-neck installation.
• Cushions the filler neck against contact with adjacent components.
• Helps reduce unwanted movement and vibration around the filler area.
• Helps limit dirt and moisture entering the surrounding filler-neck area.
• Provides a clean, factory-style finish to the fuel filler installation.
• Replaces an original sleeve that has hardened, cracked, split or deteriorated.
• Supports accurate restoration of the Porsche 356 fuel-filler assembly.

The component is commonly catalogued as a rubber filler neck collar, confirming its role around the filler-neck assembly rather than as the main fuel cap seal itself.

Symptoms Of Wear Or Failure:
Because this is a rubber protective and sealing component rather than a mechanical moving part, deterioration is normally visible.

Common signs include:

• Cracks in the rubber.
• Splitting around the circumference.
• Rubber becoming hard or brittle.
• Shrinkage with age.
• Sleeve becoming loose around the filler neck.
• Missing sections of rubber.
• Distortion or deformation.
• Surface deterioration caused by age or fuel exposure.
• Sleeve no longer sitting correctly around the filler neck.
• Excessive movement around the filler-neck opening.
• Dirt or moisture collecting around the filler installation.
• Chafing or contact between the filler neck and surrounding components.
• An untidy or incomplete appearance during restoration.

If fuel odour or liquid fuel leakage is present, the filler cap seal, neck, tank connections and surrounding fuel-system components should also be inspected, as the sleeve itself is not the primary fuel cap sealing component.

Why Replacement Matters:
Rubber components naturally deteriorate with age, particularly when exposed to fuel vapour, temperature changes and environmental contamination.

As the original sleeve hardens or shrinks, it may no longer fit closely around the filler neck. This can reduce its ability to cushion and protect the installation and may allow dirt and moisture to collect in the surrounding area.

Replacing a deteriorated sleeve helps:

• Restore correct fit around the filler neck.
• Protect the filler neck from unwanted contact and chafing.
• Reduce movement and vibration.
• Keep the surrounding area cleaner.
• Limit moisture and debris entering gaps around the filler assembly.
• Restore the original appearance of the fuel filler installation.
• Complete a proper fuel-tank or body restoration.