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Porsche // 991 (911) MK2 2016-2019 // 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19
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- Porsche 958 Cayenne Turbo V8 4.8L Petrol (500Hp) 2010-17
- Porsche 958 Cayenne Turbo S V8 4.8L Petrol (550Hp) 2010-17
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.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94811002063
The product you are viewing cross references to these numbers
- Porsche 991.1 Carrera C2 3.4L (350 Bhp) 2012-16
- Porsche 991.1 Carrera C2S / GTS 3.8L (400/430 Bhp) 2012-16
- Porsche 991.1 Carrera C4 3.4L (350 Bhp) 2012-16
- Porsche 991.1 Carrera C4S / GTS 3.8L (400/430 Bhp) 2012-16
- Porsche 991.1 Turbo 3.8L (520 Bhp) 2014-16
- Porsche 991.1 Turbo S 3.8L (560 Bhp) 2014-16
- Porsche 991.2 Turbo Coupe 3.8L (540 Bhp) 2016-19
- Porsche 991.2 Turbo S Coupe 3.8L (580 Bhp) 2016-19
- Porsche 991.2 Turbo Cabriolet 3.8L (540 Bhp) 2016-19
- Porsche 991.2 Turbo S Cabriolet 3.8L (580 Bhp) 2016-19
- Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19
Vacuum Line.
The Genuine Porsche Vacuum Line 9A111005523 is an original replacement vacuum pipe used within the brake-servo vacuum system of selected Porsche 911 991-generation models.
Fits:
Diagram Ref No 13
The line works with the engine-driven vacuum pump to provide the vacuum required by the brake booster, also known as the brake servo.
Brake assistance allows the driver's pedal input to be multiplied so that strong braking force can be achieved without excessive pedal effort.
Because modern Porsche engines cannot always provide a consistent level of intake-manifold vacuum under every operating condition, a dedicated vacuum pump is used to maintain reliable brake-servo assistance. The vacuum line provides the sealed connection required to transfer this vacuum through the system.
Age, engine-bay heat, vibration and repeated thermal cycling can eventually cause vacuum lines, seals and connections to deteriorate. A leak can reduce available brake assistance and may result in a noticeably harder brake pedal.
Replacing a damaged or leaking vacuum line helps restore the sealed vacuum circuit and maintain reliable power-assisted braking.
What This Product Does:
The vacuum line forms part of the connection between the brake-servo vacuum pump and the vehicle's brake-assistance vacuum circuit.
Its main functions are to:
- Carry vacuum generated by the vacuum pump.
- Maintain a sealed vacuum circuit.
- Support correct brake-servo operation.
- Help maintain normal brake-pedal effort.
- Provide consistent power-assisted braking.
- Accommodate engine movement and vibration.
- Prevent atmospheric air leaking into the vacuum system.
- Maintain reliable operation under different engine loads.
Symptoms Of Wear Or Failure:
Possible symptoms include:
- Brake pedal feeling harder than normal.
- Increased effort required to stop the vehicle.
- Reduced power assistance.
- Brake pedal becoming hard after repeated applications.
- Hissing from the engine or vacuum-line area.
- Visible cracks in the vacuum pipe.
- Split hose sections.
- Loose or damaged connectors.
- Damaged O-ring seals.
- Vacuum line becoming brittle.
- Vacuum line becoming distorted by heat.
- Reduced stored brake assistance after the engine is switched off.
- Changes in brake-pedal feel.
Why Replacement Matters:
Replacing a cracked, leaking or damaged Vacuum Line helps restore:
- Correct brake-servo vacuum.
- Normal brake-pedal assistance.
- Consistent pedal effort.
- Reliable vacuum retention.
- Correct vacuum-pump operation.
- Airtight system integrity.
- Predictable braking response.
A properly sealed vacuum system is essential for maintaining the brake performance characteristics intended by Porsche.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9A111005523
The product you are viewing cross references to these numbers