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

Inlet Manifold Breather Line for Fuel Tank 

Restore the efficiency of your Porsche's evaporative emissions system with this OE Match Inlet Manifold Fuel Tank Breather Line.Manufactured to original equipment specifications, this high-quality replacement breather line ensures the safe transfer of fuel vapours from the fuel tank's EVAP system to the inlet manifold, where they are burned during normal engine operation.

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 inlet manifold breather line is a vital component of the Porsche fuel vapour recovery system. It prevents harmful fuel vapours from escaping into the atmosphere while maintaining correct engine vacuum and emissions performance. A leaking or damaged breather line can cause vacuum leaks, engine management warning lights, rough running and fuel vapour odours.

Constructed from premium fuel-resistant and heat-resistant materials, this OE Match replacement delivers factory-quality fitment, dependable sealing and long-term durability, making it an ideal solution for routine maintenance or emissions system repairs.

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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