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- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 924 2.0L 1980-85
- 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
The Genuine Porsche Hose, 12 × 2.5 mm (Part Number: 99918107240) is an original equipment hose used within the fuel tank ventilation and fuel vapour management systems of selected classic Porsche models.
Fits:
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 924 2.0L 1980-85
- 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
This hose is listed in Porsche parts catalogues for selected Porsche 911 SC, 930 Turbo and 944 applications, where it connects components of the fuel tank ventilation or activated charcoal canister system.
The fuel tank ventilation system manages the movement of air and petrol vapour as fuel is consumed and temperature changes affect pressure inside the tank.
The hose provides a flexible passage between the specified ventilation components, helping maintain the intended vapour routing and allowing the fuel tank to breathe through its designed ventilation circuit.
Manufactured to Porsche's original equipment specification, the hose has nominal dimensions of 12 × 2.5 mm, corresponding to a 12 mm internal diameter and 2.5 mm wall thickness.
The hose is intended to be cut to the correct length for its particular installation, where supplied as bulk hose.
During normal operation, fuel tank ventilation hoses are exposed to petrol vapour, changing temperatures and vehicle vibration. These conditions can gradually affect the flexibility and condition of the hose material.
Over time, an ageing hose may become brittle, cracked, split, swollen or loose at its connection points.
A damaged hose can allow petrol vapours to escape or interfere with the proper operation of the ventilation circuit. This may produce a persistent fuel smell, particularly after refuelling or when the vehicle is parked in warm conditions.
Replacing a defective hose with a Genuine Porsche component helps restore the intended fuel vapour connections, reduce unwanted vapour leakage and maintain the original ventilation arrangement.
Ideal for classic Porsche fuel system repairs, tank ventilation maintenance and restoration projects, this Genuine Porsche Hose provides a correctly specified replacement for compatible applications.
What This Product Does:
The hose forms part of the vehicle's fuel tank ventilation or fuel vapour management circuit.
Its primary function is to provide a flexible passage for air and petrol vapour between designated components.
As the engine consumes fuel, the volume of liquid within the tank decreases. The ventilation system allows the resulting changes in tank pressure to be managed.
Changes in ambient temperature also affect fuel vapour pressure. The tank ventilation arrangement accommodates these changes through its connecting hoses, expansion chambers and other components.
In vehicles fitted with an activated charcoal canister, fuel vapours are routed through the appropriate vapour management system rather than being released freely.
The hose supports these functions by maintaining the intended connection.
Its main functions include:
- Supporting fuel tank ventilation: Provides a passage for air and fuel vapour within the designated circuit.
- Helping manage tank pressure: Supports normal pressure equalisation as fuel volume and temperature change.
- Connecting ventilation components: Links the relevant expansion chambers, pipes, fittings or charcoal canister components.
- Maintaining vapour routing: Helps keep fuel vapour within the intended ventilation pathway.
- Reducing unwanted vapour escape: Maintains a secure connection when correctly installed.
- Accommodating vehicle movement: Provides flexibility between connected components.
- Maintaining unrestricted flow: Allows air and vapour to pass through the specified hose section.
- Supporting emissions equipment: Helps preserve the original vapour management arrangement on vehicles equipped with an activated charcoal canister.
- Maintaining factory hose routing: Restores the correct hose size and installation arrangement.
- Supporting fuel system reliability: Helps prevent faults associated with cracked, collapsed or disconnected ventilation hoses.
Symptoms Of Wear Or Failure:
Ageing fuel tank ventilation hoses can deteriorate through prolonged exposure to petrol vapour, heat, vibration and repeated changes in temperature.
Common symptoms and signs of a worn or damaged hose include:
- Petrol smell around the vehicle: Escaping vapours may create a noticeable fuel odour.
- Fuel smell after refuelling: Vapour leakage may become more noticeable when the tank is full.
- Fuel smell in warm weather: Increased vapour formation may expose weaknesses in the ventilation circuit.
- Visible cracking: The hose surface may develop cracks as the material ages.
- Hardened or brittle hose: Loss of flexibility can affect sealing around the connection fittings.
- Split hose ends: Cracking near connection points may allow vapour leakage.
- Loose hose connections: Deteriorated hose ends may no longer grip fittings securely.
- Disconnected hose: An insecure connection can leave part of the vapour circuit open.
- Swollen or distorted material: Ageing or chemical incompatibility may affect the hose shape.
- Collapsed hose sections: Deformation may restrict airflow through the ventilation circuit.
- Kinked hose routing: Incorrect installation can obstruct the intended ventilation passage.
- Visible abrasion: Contact with sharp edges or neighbouring components may wear through the hose.
- Unusual fuel tank pressure symptoms: A restricted ventilation system may contribute to excessive pressure or vacuum in the tank.
- Damaged hose clamps: Loose or corroded clamps may compromise secure attachment.
- Persistent vapour odours after servicing: Incorrect routing or inadequate sealing may leave a connection leaking.
Why Replacement Matters:
Replacing a deteriorated ventilation hose helps maintain the correct operation of the fuel tank breathing and vapour management system.
An old hose may become cracked or brittle, allowing fuel vapours to escape around its surface or connection points.
A collapsed or incorrectly routed hose may also restrict the normal movement of air and vapour through the system.
Installing a Genuine Porsche replacement Hose 99918107240 helps to:
- Restore the intended ventilation connection: Replace a defective section of hose.
- Reduce petrol vapour leakage: Address unwanted fuel odours caused by a confirmed hose defect.
- Maintain fuel tank breathing: Support the intended movement of air and vapour.
- Help prevent ventilation restrictions: Replace collapsed or obstructed hose sections.
- Restore secure hose attachment: Renew hardened or split hose ends.
- Preserve original hose dimensions: Use the specified 12 × 2.5 mm hose reference.
- Maintain factory hose routing: Cut and fit the correct length for the relevant application.
- Support vapour management components: Maintain connections to expansion chambers or activated charcoal canisters.
- Reduce further deterioration: Replace ageing hose material before complete failure.
- Support fuel system refurbishment: Renew old hoses during fuel tank or emissions system servicing.
- Preserve classic Porsche originality: Maintain the factory-style ventilation system.
- Provide Genuine Porsche quality: Use an original equipment hose reference for the specified application.
Replacement is recommended when the hose shows cracks, brittleness, swelling, damage, persistent vapour leakage or an insecure fit.
The surrounding clamps, connection fittings, expansion chambers and other ventilation hoses should also be inspected.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99918107240
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