What is the function of the intake system in a car?

The intake system is a set of components responsible for supplying air to the engine, such as the air filter, throttle body and intake manifold.

What is the main function of the fuel system?

The fuel system is the system that delivers fuel to the engine – it includes the pump, lines, filter and injectors.

What are the symptoms of intake system damage?

A loss of power, increased fuel consumption or uneven engine operation are typical symptoms of leaks in the intake system.

Does the Audi A3 8P intake system fit other models?

Some components (e.g. filters, hoses, throttle bodies) are compatible with VW Golf V and Seat Leon, but it is always worth checking the compatibility by the VIN number.

What are the benefits of keeping a clean intake system?

Better combustion efficiency, lower fuel consumption and longer turbocharger life.

How often should you change the air and fuel filter?

Recommended replacement is every 15,000–20,000 km or once a year, depending on driving conditions.

How do you know if your fuel pump needs replacing?

Symptoms of a faulty fuel pump include difficulty starting the engine, intermittent idle at higher RPMs, and a loss of power during acceleration. It's worth checking the fuel pressure and the condition of the fuel lines.

Intake and fuel system

At Global Parts, we offer a wide selection of original used car parts, including intake and fuel systems for many popular car brands such as BMW, Mini, Mercedes, Audi, Volkswagen, and others. Our intake and fuel systems undergo quality control to ensure you receive a top-quality product.

More information

Make

Category

Subcategory

Condition

In Stock

Price

Products in promotion

Part no. 03G103493D

Audi A3 8P 1.9 TDI BLS Diesel Vacuum Breather Pipe Vent Hose Line 03G103493D

Product currently unavailable

Part no. 04L129766AQ

Audi Q3 8U Air Intake Manifold Charge Cooler 2.0 TDI DFUA 04L129766AQ

Product currently unavailable

Part no. 079133424S

Audi S5 8T 4.2 FSI CAUA Petrol Engine Intake Manifold Adapter 079133424S

Product currently unavailable

Part no. 059131057Q

Audi A7 4G8 Engine Vacuum Hose Line Pipe Hose 059131057Q

Product currently unavailable

Part no. 059130308E

Audi A7 4G8 Fuel Feed Line Pipe Hose 059130308E

Product currently unavailable

Part no. 8E0129955

Intercooler Pulsation Damper Audi A4 B7 A6 C6 2.0 TDI Diesel 8E0129955

Product currently unavailable

Part no. 8E0919051CP

Audi A4 B7 Tank Fuel Supply Pump Sender Delivery Unit 8E0919051CP

Product currently unavailable

Part no. 07L127026A

Audi S8 D3 High Pressure Fuel Pump 07L127026A

Product currently unavailable

Part no. 4G0919050

Audi A7 4G8 3.0 TDI Diesel Fuel Pump Sender Sending Unit 4G0919050

Product currently unavailable

Part no. 06H133986H

Audi A4 B8 Fuel Line Fuel Feed Return Pipe Hose 2.0 Petrol 06H133986H

Product currently unavailable

Part no. 5Q0145832E

Audi S3 8V VW Golf R Air Charge Intercooler Pipe Hose 2.0 TFSI 5Q0145832E

Product currently unavailable

Part no. 8K0919050H

Audi A4 B8 2.0 TDI Diesel Fuel Pump Tank Fuel Sender 8K0919050H

Product currently unavailable

Part no. 7L6145945J

Audi Q7 4L Intercooler Air Charge Intake Pipe Hose Line 7L6145945J

Product currently unavailable

Part no. 1K0145762BP

Audi A3 8P TDI Charge Pipe Intercooler Pipe Air Intake Hose 1K0145762BP

Product currently unavailable

Part no. 07L133424E

Audi S8 D3 5.2 FSI Quattro Intake Manifold Ventilation Hose 07L133424E

Product currently unavailable

Part no. 057129711AK

Audi A8 D4 Intake Inlet Mainfold Left N/S 4.2 TDI Diesel Engine 057129711AK

Product currently unavailable

Part no. 06E130090F-1

Audi A4 B8 A6 C7 Fuel Rail Right Side O/S 3.0 TFSI CAKA Petrol 06E130090F

Product currently unavailable

Part no. 6C0129607K

Audi A1 S1 8X 2.0 TFSI Petrol Air Filter Box Housing 6C0129607K

Product currently unavailable

Part no. 06K145702T

Volkswagen Golf Mk7 GTI Audi S1 8X A3 2.0 TSI TFSI Turbocharger 06K145702T

Product currently unavailable

Part no. 04E129651A

Audi A3 8V 1.4 TFSI Air Inlet Duct Channel Intake Hose Pipe Line 04E129651A

Product currently unavailable

Part no. 022133907

Audi A3 8P 3.2 FSI Vacuum Reservoir Bottle Tank Pressure Container 022133907

Product currently unavailable

Part no. 5N0131877D

Audi Q3 8U 2.0 TDI Diesel Adblue Additive Reservoir Fuel Tank 5N0131877D

Product currently unavailable

Part no. 059145762BJ-1

Audi A4 B9 A7 4G Air Intake Inlet Duct Pipe Diesel 3.0 TDI 059145762BJ

Product currently unavailable

Part no. 06F133837S

Engine Top Cover Audi TT 8J A3 8P 2.0 TFSI Petrol Panel Trim 06F133837S

Product currently unavailable

Part no. 4G0133838L

Audi A6 C7 2.0 TDI CGLC Diesel Air Filter Box Housing 4G0133838L

Product currently unavailable

Part no. 05L145762H-1

Audi A4 B9 A5 8F 2.0 TDI Air Charge Intercooler Pipe Intake Hose 05L145762H

Product currently unavailable

Part no. 079145785H

Audi A7 S7 4G 4.0 TFSI Intercooler Charge Air Cooler Radiator 079145785H

Product currently unavailable

Part no. 022133317M-1

Audi TT 8J 3.2 FSI V6 BUB Petrol Fuel Rail Line Injectors 022133317M

Product currently unavailable

Part no. 8K0145673AL

Audi A4 B8 2.0 TDI Air Intake Hose Turbo Intercooler Pipe Line 8K0145673AL

Product currently unavailable

Part no. 03D133062F

VW Volkswagen Polo 6R Throttle Body 1.2 CGPB Petrol 03D133062F

Product currently unavailable

Part no. 07L133085A

Audi S8 D3 Air Distribution Intake Manifold Bridge 07L133085A

Product currently unavailable

Audi A3 8P TT 8J VW Golf GTI 2.0 TFSI Turbo Oil Return Pipe Hose 06F145735D

-5%

Part no. 06F145735D

Audi A3 8P TT 8J VW Golf GTI 2.0 TFSI Turbo Oil Return Pipe Hose 06F145735D

Product currently unavailable

Part no. 059145722R-1

Audi Q7 4L Engine Turbocharger Turbo 059145722R

Product currently unavailable

Part no. 7N0127242

Audi Q3 8U Fuel Pipe Hose Pressure Sensor Unit 7N0127242

Product currently unavailable

Part no. 057121083M

Audi Q7 4L 4.2 TDI Coolant Water Pipe Radiator Hose Line Tube 057121083M

Product currently unavailable

Part no. 06K145722G

Audi TT FV 2.0 TFSI Petrol Engine Turbo Turbocharger 06K145722G

Product currently unavailable

Part no. 5Q0129607AA

VW Skoda Seat Audi Engine Air Filter Box Housing 2.0 TDI Diesel 5Q0129607AA

Product currently unavailable

Part no. 7L6127401F

Fuel Filter Housing Audi Q7 4L VW Touareg 7L 4.2 Tdi V8 3.0Tdi Diesel 7L6127401F

Product currently unavailable

Part no. 8W0201799C

Audi A4 B9 Activated Charcoal Filter Active Carbon 8W0201799C

Product currently unavailable

Part no. 06E133210L

Audi A4 B8 A6 C6 C7 Petrol Intake Inlet Mainfold 06E133210L

Product currently unavailable

Part no. 7L6145770AA

Audi Q7 4L Charge Intake Air Line Pipe Hose Duct Turbo 7L6145770AA

Product currently unavailable

Part no. 079133551B

Audi S4 B6 B7 4.2 V8 Fuel Injector Injection Nozzle 079133551B

Product currently unavailable

Part no. 04L145762AG

Audi A3 8V 2.0 TDI Diesel Intercooler Air Charge Intake Pipe Hose 04L145762AG

Product currently unavailable

Part no. 8E0927317H

Audi S5 8T 4.2 FSI V8 CAUA Petrol Engine Vacuum Pump 8E0927317H

Product currently unavailable

Part no. 5N0145840K

Audi A3 8P VW Passat B7 Turbo Intercooler Air Intake Pipe Hose 5N0145840K

Product currently unavailable

Part no. 022115629S

Audi A3 8P Dip Stick Oil Level Guide Pipe 022115629S

Product currently unavailable

Part no. 06B145771P

Audi A4 B7 1.8T Engine Turbo Oil Feed Pipe Hose 06B145771P

Product currently unavailable

Part no. 059145721F

Audi A4 B7 2.7 TDI BPP Diesel Engine Turbo Turbocharger 059145721F

Product currently unavailable

Part no. 4G0131879F

Audi A6 C7 4G AdBlue Additive Tank Reservoir Container Module Diesel 4G0131879F

Product currently unavailable

Part no. 06A145713F

Audi A3 8L TT 8N VW Golf Mk4 Turbocharger 1.8T Petrol Engine 06A145713D

Product currently unavailable

Part no. 059130298D

Audi A4 B9 Q7 4M Fuel Return Hose Pipe Line 3.0 TDI Diesel 059130298D

Product currently unavailable

Part no. 059145950J

Audi A4 B7 2.7 TDI BPP Diesel Engine Throttle Body 059145950J

Product currently unavailable

Part no. 057145958N

Audi Q7 4L 4.2 TDI V8 Intercooler Air Pressure Pipe Right Lower O/S 057145958N

Product currently unavailable

Part no. 1K0145762BM

Audi TTS 8J 2.0 TFSI Intake Hose Air Charge Intercooler Pipe Line 1K0145762BM

Product currently unavailable

Part no. 4L0131901

Fluid Pump Unit Audi A8 D4 Q7 4L 3.0 TDI SCR AdBlue Reservoir 4L0131901

Product currently unavailable

Part no. 06A133352C

Audi TT 8N 1.8T Carbon Fuel Filter Connecting Pipe Hose Line 06A133352C

Product currently unavailable

Part no. 4G0131969

Audi A6 C7 4G TDI Diesel Engine AdBlue Fluid Pump Sender Unit 4G0131969

Product currently unavailable

Part no. 8E0129955B

Audi A4 B7 A6 C6 2.0 TDI Diesel Intercooler Pulsation Damper 8E0129955B

Product currently unavailable

Part no. 079145910H

Oil Feed Pipe Audi S6 C7 S7 4G8 4.0 TFSI Turbo Charger Oil Line 079145910H

Product currently unavailable

Part no. 06D127501R

Audi A4 B7 2.0 TFSI BGB Petrol Fuel Hose Line Pipe Tube 06D127501R

Product currently unavailable

Part no. 079145909H

Oil Feed Pipe Audi S6 C7 S7 4G8 4.0 TFSI Turbo Charger Oil Line 079145909H

Product currently unavailable

Part no. 06E906036F

Audi A4 B8 3.2 FSI CALA Fuel Injector Injection Nozzle 06E906036F

Product currently unavailable

Part no. F01C250148

Volkswagen Seat Skoda Audi 2.0 Diesel Adblue Tank Pump Sender Unit F01C250148

Product currently unavailable

Part no. 8R0145790A

Audi Q5 8R Intercooler Air Charge Pipe Hose Line 8R0145790A

Product currently unavailable

Part no. 8R0919050E

Audi Q5 8R Diesel Electrical Fuel Pump 8R0919050E

Product currently unavailable

Part no. 06Q145703H

Audi S3 8Y 2.0 TFSI Turbocharger Turbo Charger 06Q145703H

Product currently unavailable

Part no. 04E145749B

Audi A1 8X A3 8V Intake Manifold Charge Air Cooler Intercooler 04E145749B

Product currently unavailable

Part no. 06A133681B

Audi TT 8N A3 8P Fuel Injectors Injection Rail Line 1.8T Petrol 06A133681B

Product currently unavailable

Part no. 06Q145703H-2

Audi S3 8Y 2.0 TFSI Turbocharger Turbo Charger Housing Cover 06Q145703H

Product currently unavailable

Part no. 059130241DA

Audi A7 4G 3.0 TDI Diesel Fuel Injection Line Pressure Pipe 059130241DA

Product currently unavailable

Audi RS3 8V Air Intake Channel Guide Duct Hose Pipe 8V0145693

-5%

Part no. 8V0145693

Audi RS3 8V Air Intake Channel Guide Duct Hose Pipe 8V0145693

Product currently unavailable

Part no. 5Q0919050P

Audi A3 8V 1.6 TDI CLHA Diesel Fuel Level Sensor Pump Sender Unit 5Q0919050P

Product currently unavailable

Part no. 4H0145762H

Audi A8L 4H 3.0 TDI CDTA Diesel Intercooler Pipe Hose Line Tube 4H0145762H

Product currently unavailable

Part no. 03C103558L

Audi A1 8X 1.4 TSI Control Valve Breather Line Pipe 03C103558L

Product currently unavailable

Part no. 03C133062T

VW Polo 6R Audi A1 8X Seat Ibiza 5 1.4 TSI Engine Throttle Body 03C133062T

Product currently unavailable

Part no. 1K0919673AH

Audi TT 8J 2.0 TFSI Fuel Tank Level Floating Sensor Control Unit 1K0919673AH

Product currently unavailable

Part no. 04E129709G

Audi Volkswagen Seat Skoda Inlet Intake Manifold Assembly 04E129711J

Product currently unavailable

Part no. 8K0131878H

Audi A5 8T 2.0 TDI CNHA Diesel Adblue Reservoir Fuel Tank Passive 8K0131878H

Product currently unavailable

Part no. 058133459

Audi S4 B7 Vacuum Pressure Purge Valve 058133459

Product currently unavailable

Part no. 06A133817Q

Audi TT 8N 1.8 T Secondary Air Pump Connector Hose Pipe Line 06A133817Q

Product currently unavailable

Part no. 1C0906517A

Audi A4 B7 1.8T Petrol Vacuum Solenoid Valve Inlet Purge Breather 1C0906517A

Product currently unavailable

Part no. 06M145674AT

Audi A4 S4 B9 A5 S5 F5 Intercooler Hose Pipe Line 3.0 Petrol 06M145674AT

Product currently unavailable

Part no. 07K133062G

Audi RS3 8V 2.5 TFSI Engine Throttle Body Valve Flap Motor Actuator 07K133062G

Product currently unavailable

Part no. 8K0145805G

Audi A4 B8 Intercooler Radiator Air Charge Cooler Unit Diesel 8K0145805G

Product currently unavailable

Part no. 06M103210EB

Audi A4 B9 Engine Air Vent Hose Pipe 06M103210EB

Product currently unavailable

Part no. 06H133201AN

Audi A4 B8 A5 8T 2.0 TFSI Quattro Air Intake Inlet Manifold 06H133185CF

Product currently unavailable

Part no. 059130277ED

Audi A6 A7 4G 3.0 TDI Diesel Fuel Injector 059130277ED

Product currently unavailable

Part no. 4L0130307G

Audi Q7 4L 3.0 TDI Fuel Tank Pipe Line Hose Tube 4L0130307G

Product currently unavailable

Part no. 8R0129618J

Audi Q5 8R Air Intake Duct Pipe Hose 8R0129618J

Product currently unavailable

Part no. 1K0129618BM

Audi TT 8J Air Filter Box Intake Pipe Tube 2.0 TFSI Petrol 1K0129618BF

Product currently unavailable

Audi A4 B8 A5 8T Air Duct Intake Air Pipe Tube 8K0129618

-5%

Part no. 8K0129618

Audi A4 B8 A5 8T Air Duct Intake Air Pipe Tube 8K0129618

Product currently unavailable

Part no. 4M0131941C

Audi A4 B9 8W TDI Diesel AdBlue SCR Reducer Quality Sensor 4M0131941C

Product currently unavailable

Part no. 078906283A

Audi TT 8N Actuator Turbocharger Boost Pressure Control Solenoid 078906283A

Product currently unavailable

Part no. 04L131113J

Audi A4 B9 2.0 TDI DTNA Adblue Injector Valve 04L131113J

Product currently unavailable

Part no. 04L129635F

Audi A4 B9 2.0 TDI DETA Diesel Air Intake Connection Pipe Hose Line 04L129635F

Product currently unavailable

Part no. 04L130089F

Audi A3 8V 30 TDI DGTE Diesel Fuel Injection Rail 04L130089F

Product currently unavailable

Part no. 06L145722S

Audi Q5 FY 2.0 TFSI Petrol Engine Turbo Turbocharger 06L145722S

Product currently unavailable

Part no. 07L133185M

Audi S6 C6 S8 D3 5.2 FSI V10 Inlet Intake Manifold Air Intake 07L133185M

Product currently unavailable

Part no. 03L145701D

Audi A4 B8 Seat Exeo Turbo Charger Turbocharger 2.0 TDI CAGA 03L145701D

Product currently unavailable

...

Showing 892-990 of 1375 products

Comprehensive offer of used intake and fuel system parts – air filters, throttles, fuel pumps, injectors, and intake manifolds

What components make up the intake and fuel system?

Have you ever wondered what determines your engine's performance and efficiency? The intake and fuel systems play a crucial role in ensuring the proper mixing of air and fuel, which translates into power, economy, and environmental friendliness. At Global Parts, you'll find a wide selection of used car parts. , such as air filters, **throttle valves , fuel pumps and fuel injectors We offer parts for intake and fuel systems for BMW , Audi, Volkswagen , Mercedes , and Mini, tailored to various models and needs.

Definition and importance of systems in your vehicle

A car's intake system is a set of components responsible for supplying the appropriate amount of air to the internal combustion engine . Together with the fuel system, it forms the engine's primary power supply. Their combined operation is crucial for the engine's efficiency, dynamics, and refinement. For example, in the Audi A3 8P 2.0 TFSI, properly tuned intake and fuel systems allow for power output of up to 200 hp while maintaining optimal fuel consumption.

How does the intake and fuel system work?

The intake and fuel systems work together to deliver a mixture of air and fuel to the combustion chamber. Each component of the system has a specific task:

Fuel pumps and level sensors – They are responsible for the correct supply of fuel to the engine and controlling its amount in the tank.

Fuel tanks and filler pipes – They store fuel and allow for safe refueling.
Air and fuel intake sensors – They monitor the amount of air and fuel supplied, optimizing engine operation.
Throttles – They regulate air flow to the engine, affecting its performance and response to the gas pedal.
Vacuum pumps – They support the operation of vacuum systems, such as brakes and control valves.
Air filters – They protect the engine from contamination by ensuring clean air during the combustion process.
Fuel filters – Removes impurities from the fuel, protecting the injection system and fuel pump.
Intake manifolds – Distributes air evenly into the cylinders, increasing combustion efficiency.
Air filter housings – They protect air filters from damage and ensure their optimal operation.
Cables, hoses and tubes – They transport fuel and air between individual system components.
Turbochargers, compressors and coolers – They increase the amount of air supplied to the engine, improving its performance.
Injection systems and parts – They are responsible for the precise dosing of fuel to the cylinders, which affects combustion and engine efficiency.
Fuel filler flaps and caps – They ensure the tightness of the refueling system and protection against leaks. Well-maintained intake and fuel system components not only improve performance, but also lower fuel consumption and reduce exhaust emissions.

Intake and fuel system parameters and compatibility

Part type	Function	Typical parameters	Compatibility
Air filter	Air purification	Flow 300–600 m³/h	Audi A3 8P, VW Golf V, Seat Leon
Fuel pump	Fuel delivery	Pressure 3–5 bar	BMW E90, Mercedes W204, VW Passat B6
Intake manifold	Air distribution	Material: aluminum	Audi A4 B8, Skoda Superb, VW Tiguan

Why is it worth taking care of the intake and fuel system?

Regular maintenance and replacement of intake and fuel system components is essential for the proper operation of any vehicle. Contamination or wear of components can lead to:

Reduced engine power.
Higher fuel consumption.
Damage to other components, such as turbochargers or catalytic converters. By choosing genuine used car parts from Global Parts, you can save money without compromising quality and durability. Our selection includes intake system parts that ensure excellent engine performance.

Benefits of proper fit

A well-maintained intake system improves the engine's flexibility, while a functioning fuel system improves stability under varying loads. Their interaction not only improves performance but also lowers operating costs. Proper component matching (e.g., by VIN or OEM number) ensures correct installation and full compatibility with the engine control electronics.

How to choose the right intake and fuel system parts?

When deciding to purchase parts, pay attention to several key aspects:

Vehicle-specific fit – Every make and model has its own unique technical requirements. At Global Parts, you'll find parts tailored to your car, whether it's a BMW , Audi, Volkswagen , Mercedes , or Mini .
Technical condition – Check whether components such as fuel lines , fuel pumps or injectors , are free from damage and ready for further use.
Material – For example, intake manifolds can be made of aluminum or plastic. Choosing the right material affects durability and efficiency.

Comparison of part types

It's worth noting the differences between original equipment and aftermarket parts. Original equipment (OEM) parts are perfectly matched to a specific vehicle model; for example, the Audi A3 8P 1.6 FSI intake system has different parameters than its equivalent in the VW Golf V. Aftermarket parts, on the other hand, often offer broader compatibility, allowing for more flexible installation while maintaining high efficiency.

Why choose used parts for the intake and fuel system?

Used car parts are the perfect solution that combines high quality with cost savings. At Global Parts, we offer a wide selection of components, such as air filters, throttle bodies, and fuel injectors, all of which have undergone rigorous quality inspections. Why choose this solution?

Lower costs – Used components, such as fuel pumps and intake manifolds, are often much cheaper than new ones, and their quality remains high.
Ecology – Choosing used car parts, you support recycling and reduce the amount of automotive waste.
Wide availability – We offer parts for all the most popular brands, allowing for easy fitment to your vehicle.

How to take care of the intake and fuel system?

To keep your engine running efficiently, regularly check the condition of your intake and fuel systems . Here are some tips:

Change air filters regularly and check intake hoses for leaks.
Keep your fuel injectors clean – contamination can reduce their performance.
Check the condition of the fuel pump and hoses to avoid problems with engine power. In case of breakdown or wear and tear, you will find the right used car parts at Global Parts that will help restore your vehicle to full working order.

Intake and fuel system diagnostic procedure

To assess the condition of the intake and fuel systems, it is worth performing simple diagnostics:

Check the tightness of the pipes and connections.
Assess the condition of your air filter – excessive dirt can reduce airflow by 30%.
Measure the fuel pressure – a difference of more than 0.5 bar from the nominal value may indicate a pump fault.
Check the air flow meter - its incorrect readings cause the engine to run unevenly.

FAQ - Frequently asked questions about the intake and fuel system

Question	Answer
What is the function of the intake system in a car?	The intake system is a set of components responsible for supplying air to the engine, such as the air filter, throttle body and intake manifold.
What is the main function of the fuel system?	The fuel system is the system that delivers fuel to the engine – it includes the pump, lines, filter and injectors.
What are the symptoms of intake system damage?	A loss of power, increased fuel consumption or uneven engine operation are typical symptoms of leaks in the intake system.
Does the Audi A3 8P intake system fit other models?	Some components (e.g. filters, hoses, throttle bodies) are compatible with VW Golf V and Seat Leon, but it is always worth checking the compatibility by the VIN number.
What are the benefits of keeping a clean intake system?	Better combustion efficiency, lower fuel consumption and longer turbocharger life.
How often should you change the air and fuel filter?	Recommended replacement is every 15,000–20,000 km or once a year, depending on driving conditions.
How do you know if your fuel pump needs replacing?	Symptoms of a faulty fuel pump include difficulty starting the engine, intermittent idle at higher RPMs, and a loss of power during acceleration. It's worth checking the fuel pressure and the condition of the fuel lines.

Summary: Intake and Fuel Systems at the Global Parts Automotive Store

The intake and fuel systems are fundamental to the proper functioning of any engine. By choosing the right parts, such as throttle bodies, air filters, fuel injectors, and fuel pumps, you can ensure your car's performance, improve fuel economy, and reduce exhaust emissions. The Global Parts automotive store invites you to browse our wide selection of genuine used car parts . Whether you're looking for car parts for BMW , Audi , Volkswagen , Mercedes, Mini , or more, you'll find them at competitive prices. We strive to ensure every customer finds the right parts for their car, and if you have any questions or concerns about selecting the right components, we're happy to help! Please contact us – we're here to help! For more information and interesting facts, visit our automotive blog .

mini auto parts volkswagen genuine parts used car parts spare parts motor store genuine used mercedes parts genuine used audi parts bmw air & fuel delivery mercedes air & fuel delivery mini air & fuel delivery audi air & fuel delivery volkswagen air & fuel delivery