Inlet Manifold Breather Line for Fuel Tank. Porsche 958 Cayenne / Cayenne S  ❭  94811002063

Inlet Manifold Breather Line for Fuel Tank 

Maintain the efficiency and reliability of your Porsche's evaporative emissions system with this Inlet Manifold Fuel Tank Breather Line. Manufactured to Porsche's exact original equipment standards, this factory-original breather line provides the precise fit, durability and performance required to safely transfer fuel vapours from the fuel tank EVAP system to the engine's inlet manifold.

Fits:

• Porsche 958 Cayenne Turbo V8 4.8L Petrol (500Hp) 2010-17
• Porsche 958 Cayenne Turbo S V8 4.8L Petrol (550Hp) 2010-17

Diagram ref no 4

The fuel tank breather line is an essential part of the evaporative emissions (EVAP) system. Instead of allowing fuel vapours to escape into the atmosphere, the system routes them to the inlet manifold, where they are burned during normal combustion. This improves emissions performance, supports engine efficiency and helps maintain the correct intake vacuum.

Over time, breather lines can become brittle, crack or develop leaks due to prolonged exposure to heat, fuel vapours and engine movement. Replacing a damaged breather hose with a Genuine Porsche component restores factory performance while ensuring maximum reliability and long service life.

What Does the Inlet Manifold Fuel Tank Breather Line Do?

The breather line connects the fuel tank evaporative emissions (EVAP) system to the inlet manifold, allowing fuel vapours collected within the charcoal canister to be safely drawn into the engine and burned during combustion.

Its functions include:

• Transporting fuel vapours from the EVAP system to the engine.
• Preventing fuel vapour emissions from escaping into the atmosphere.
• Maintaining correct intake vacuum.
• Supporting efficient engine performance.
• Helping reduce exhaust emissions.
• Assisting compliance with modern emissions regulations.

A properly functioning breather line is essential for maintaining both engine efficiency and environmental performance.

Why Does the Breather Line Fail?

The breather line is constantly exposed to engine heat, vacuum pressure and fuel vapours, which can eventually cause deterioration.

Common causes of failure include:

• Heat-related ageing.
• Hardening or cracking of the hose.
• Fuel vapour degradation.
• Vacuum leaks.
• Damaged hose connectors.
• Engine movement stressing the pipework.
• Wear during servicing or engine repairs.

Replacing worn breather lines helps maintain the integrity of the EVAP system and prevents unwanted air entering the intake system.

Symptoms of a Failing Breather Line

Typical warning signs include:

• Engine management warning light.
• EVAP system fault codes.
• Fuel smell around the engine or vehicle.
• Rough or unstable idle.
• Vacuum leak or hissing noises.
• Poor fuel economy.
• Reduced engine performance.
• Visible cracking or deterioration of the hose.

Replacing the breather line promptly can often eliminate emissions-related faults and restore smooth engine operation.

When Should the Breather Line Be Replaced?

Replacement is recommended when:

• The hose becomes brittle or cracked.
• Vacuum leaks are detected.
• Fuel vapour leaks are present.
• EVAP fault codes are diagnosed.
• The inlet manifold is removed during servicing.
• Carrying out preventative maintenance on higher mileage vehicles.

Replacing ageing breather hoses helps maintain reliable emissions system performance and prevents future vacuum leaks.

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94811002063

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