Fuel Lines & Breather Hoses

Mounting bracket fuel pipe clamp. 

Fits:
Porsche 911 turbo - 1975 to 1989
Porsche 964 turbo - 1991 to 1993

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Diagram ref no 10

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93011043401

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Overflow hose for fuel filler neck.

Fits:
Porsche 911 1978-89
Porsche 964 1989-94
Porsche 993 1994-98

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Diagram ref no 24

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96420115300

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Overflow hose for fuel filler neck.
The overflow hose provides a vent path for fuel vapours and excess pressure from the fuel filler neck to the tank vent/evaporative system, preventing pressure buildup and aiding smooth refuelling without backflow or spills.

Fits:
Porsche 911 1978 - 1989
Porsche 964 1989 - 1994
Porsche 993 1994 - 1998

Diagram ref no 24

The hose fits between the fuel filler neck and the fuel tank vent/overflow outlet, allowing controlled relief of fuel vapours and pressure during refuelling and normal operation. A compromised or deteriorated hose can lead to fuel vapour leaks, poor venting, fuel smell at the rear of the vehicle, or difficulty refuelling due to trapped pressure.

This OE Match hose offers a direct replacement solution for restoration, maintenance, or repair when the original hose shows signs of age or damage.

Function:
•  Ensures proper venting of fuel fumes and pressure from the filler neck
•  Maintains correct fuel system breather operation
•  Prevents fuel vapour leaks and associated odours
•  Durable, fuel-resistant construction for long service life

The fuel filler overflow/vent hose plays a small but important role in maintaining proper fuel system behaviour. A cracked, hardened, or leaking hose can cause fuel vapour smells, trapped pressure that makes refuelling difficult, and potential environmental or safety issues. Replacing it with an OE Match hose restores correct venting and refuelling behaviour while helping keep the fuel system sealed and odour free.

When to replace:
•  Visible cracking, swelling, or brittleness of the hose
•  Noticeable fuel vapour smell near filler area
•  Difficulty filling the tank (pressure backflow)
•  During restoration or fuel system servicing
•  If original hose shows age-related deterioration

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96420115300

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Protective sheath covering. 

Fits:

Porsche 911 / 912 - 1965 to 1989
Porsche 914

Protective sheathing cover for fuel ventilation lines and wiring harness

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Diagram ref no 42

Hose clip fuel line A9 x 18
Bleed nipple cap for brake caliper and clutch slave cylinder

Fits:
Porsche 356B
Porsche 911 - 1965 to 1989
Porsche 964 - 1989 to 1994
Porsche 993 - 1994 to 1998
Porsche 944 - 1982 to 1989
Porsche 928 - 1978 to 1990

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Diagram ref no 15

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90135192712

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Tapping screw B4,8 x 13 - Multiple applications

Fits:
Porsche 911 - 1965 to 1989
Porsche 964 - 1989 to 1994
Porsche 993 - 1994 to 1997
Porsche 914 - 1970 to 1976

Porsche 957 Cayenne - 2007 to 2010

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90011909101

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Tapping screw B4,8 x 13 - Multiple applications

Fits:
Porsche 911 - 1970 to 1989
Porsche 964 - 1989 to 1994
Porsche 993 - 1994 to 1997
Porsche 928 - 1983 to 1995



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90038400601

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Vent Hose.

The Genuine Porsche Vent Hose (Part Number: 91120191501) is an original equipment fuel tank ventilation component designed for selected classic Porsche 911 and 930 Turbo models.

Fits:

• Porsche 911 1981-1983 3.0L / SC
• Porsche 911 1981-1983 3.3L Turbo (930)  

Diagram Ref No 8

Also described as a fuel tank breather hose, this component forms part of the vehicle's fuel tank ventilation system, allowing air and fuel vapours to move through the designated ventilation circuit.

The fuel tank ventilation system is essential for managing pressure changes within the fuel tank as fuel is consumed, temperatures change and petrol vapour develops.

Rather than allowing fuel vapours to escape through uncontrolled openings, the ventilation arrangement routes them through the appropriate hoses, expansion chambers and associated components.

The Genuine Porsche Vent Hose provides a flexible connection within this system, helping maintain the intended flow of air and fuel vapour.

The hose is associated with the fuel tank ventilation assemblies used on selected Porsche 911 SC and 930 Turbo vehicles.

During normal operation, the fuel level changes as the engine consumes petrol. At the same time, variations in ambient temperature can cause fuel vapour to expand or contract.

The ventilation system accommodates these changes, helping prevent excessive pressure or vacuum from developing within the fuel tank.

A correctly installed breather hose helps maintain the integrity of the ventilation circuit and reduces the risk of vapour escaping through damaged connections.

Over time, the original hose may deteriorate because of age, fuel vapour exposure, heat, vibration or repeated movement.

The material can become hardened, brittle, cracked or split, while the ends may lose their ability to form a reliable connection with the associated fittings.

A damaged vent hose can allow petrol vapours to escape, producing an unpleasant fuel smell around the vehicle. Depending on the location and nature of the damage, it may also affect the operation of the tank ventilation system.

Replacing a worn or damaged hose with a Genuine Porsche component helps restore the original ventilation arrangement, maintain secure vapour connections and support reliable fuel tank pressure management.

Ideal for classic Porsche fuel system maintenance, tank ventilation repairs and restoration projects, this Genuine Porsche Vent Hose provides a factory-specified replacement for compatible applications.

What This Product Does:
The vent hose is part of the fuel tank breathing and vapour management system.

Its primary function is to provide a passage through which air and petrol vapours can move between the designated components of the fuel tank ventilation circuit.

As fuel is consumed, air must be able to enter or move through the ventilation arrangement to prevent excessive vacuum developing inside the tank.

When fuel temperature rises, petrol vapour can expand and increase pressure inside the tank.

The ventilation system accommodates these pressure changes through its associated hoses, expansion tanks and vapour management components.

The vent hose supports this process by maintaining the required connection within the system.

Its main functions include:

• Allowing fuel tank ventilation: Provides a passage for air and fuel vapour within the specified ventilation circuit.
• Supporting pressure equalisation: Helps prevent excessive pressure differences from developing in the fuel tank.
• Accommodating fuel vapour expansion: Allows vapour movement as temperature and fuel conditions change.
• Supporting fuel tank breathing: Helps maintain the intended ventilation arrangement as petrol is consumed.
• Connecting ventilation components: Provides a flexible connection between associated pipes, fittings or expansion chambers.
• Limiting unwanted vapour escape: Helps contain fuel vapours within the designated ventilation pathway.
• Maintaining correct system routing: Preserves the factory-designed arrangement of ventilation hoses.
• Supporting reliable fuel tank operation: Helps prevent ventilation restrictions caused by a damaged or collapsed hose.
• Accommodating normal vehicle movement: Provides flexibility between connected components.
• Supporting fuel system maintenance: Allows deteriorated sections of the ventilation circuit to be renewed.

The vent hose does not pump fuel or deliver pressurised petrol to the engine.

It is a fuel tank ventilation component, separate from the main fuel supply and return hoses.

Symptoms Of Wear Or Failure:
Fuel tank ventilation hoses are exposed to petrol vapour, temperature changes and long periods of service.

On older Porsche vehicles, ageing rubber and deteriorated hose connections can cause ventilation faults.

Common signs and symptoms of a worn or damaged vent hose include:

• Petrol smell around the vehicle: Escaping fuel vapour may produce a noticeable petrol odour.
• Fuel smell in the luggage compartment: A leaking ventilation hose in the front luggage compartment area may allow vapours to accumulate.
• Fuel smell after refuelling: Vapour leakage may become more noticeable when the fuel tank is full.
• Fuel smell during warm weather: Higher temperatures can increase vapour generation and expose weaknesses in the ventilation circuit.
• Cracked hose material: Ageing may cause visible splits or cracks in the hose surface.
• Hardened or brittle hose: Rubber deterioration can reduce flexibility and sealing performance.
• Loose hose connections: Worn hose ends may no longer grip the connecting fittings securely.
• Split hose ends: Repeated removal or prolonged ageing may cause cracking around the connection points.
• Collapsed hose sections: Deformation may restrict the intended movement of air or vapour.
• Blocked ventilation passage: Debris, deterioration or incorrect hose routing may obstruct the circuit.
• Excessive pressure release when opening the fuel cap: Abnormal tank pressure may indicate a ventilation restriction.
• Fuel tank vacuum symptoms: A severely restricted ventilation system may interfere with normal fuel tank breathing.
• Visible hose swelling: Chemical exposure or incompatible hose materials may affect the hose's shape.
• Disconnected ventilation hose: A detached hose may leave the circuit open to the surrounding area.
• Deteriorated hose clamps: Corroded or loose retaining components may compromise the connection.
• Repeated fuel vapour odours after repairs: An incorrectly routed or inadequately secured hose may continue to leak vapour.

Why Replacement Matters:
Replacing a deteriorated fuel tank vent hose is important for maintaining the original fuel tank ventilation arrangement.

A cracked or split hose may allow petrol vapours to escape into areas where they should not be present.

A collapsed or obstructed hose may also interfere with the fuel tank's ability to manage normal pressure changes.

On classic Porsche vehicles, original rubber components may have experienced several decades of heat exposure, vibration and contact with fuel vapours.

Even where a hose appears intact, its ends may have hardened and become less effective at sealing against the connecting fittings.

Installing a Genuine Porsche replacement Vent Hose helps to:

• Restore fuel tank ventilation: Renew a damaged connection within the breathing system.
• Reduce unwanted petrol odours: Address vapour leakage caused by a confirmed defective hose.
• Support pressure equalisation: Maintain the intended movement of air and fuel vapour.
• Prevent unwanted vapour escape: Restore the appropriate connection between ventilation components.
• Replace deteriorated rubber: Renew cracked, brittle or hardened hose material.
• Maintain secure hose connections: Restore proper attachment to the associated fittings.
• Prevent ventilation restrictions: Replace collapsed or obstructed hose sections.
• Support fuel tank operation: Maintain the correct breathing arrangement during normal fuel consumption.
• Preserve factory hose routing: Restore Porsche's intended ventilation layout.
• Support fuel system refurbishment: Replace ageing components during tank or expansion chamber servicing.
• Improve long-term reliability: Reduce the likelihood of further hose deterioration.
• Support classic Porsche restoration: Maintain the original fuel tank ventilation system.
• Maintain Genuine Porsche specifications: Use the specified original equipment reference rather than an unverified generic hose.

Replacement is particularly recommended when the hose is visibly cracked, hardened, split, swollen, detached or otherwise damaged.

The surrounding ventilation hoses, expansion tanks, fittings and retaining clamps should also be inspected during replacement.

Related reference numbers
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91120191501

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