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Porsche > Cayenne 9YA.2 2023>> > 9YA.2 Cayenne Turbo E-Hybrid Coupe with GT Package V8 4.0 739Hp 2023>> > Engine Rebuild Parts > Fuel System Parts >

Fuel Pumps

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Tappet High Pressure Fuel Pump. Porsche 976 Panamera 4.0ltr / 9YA.2 Cayenne 4.0ltr - PAC109311
2
Tappet High Pressure Fuel Pump. Porsche 976 Panamera 4.0ltr / 9YA.2 Cayenne 4.0ltr
Special Order item
PAC109311
Product Information
Product Information

High Pressure Fuel Pump Tappet
Sold each - 2 required per car

The high pressure fuel pump tappet is a precision-engineered component used in the direct-injection fuel system of Porsche 976 Panamera 4.0-litre models and 9YA.2 Cayenne 4.0-litre models. Positioned between the camshaft and the high-pressure fuel pump, this tappet transfers camshaft motion to drive the pump and generate the fuel pressure required for efficient combustion.

Fits:

  • Porsche 9YA.2 Cayenne S Coupe V8 4.0L 474Hp 2023>>
  • Porsche 9YA.2 Cayenne Turbo E-Hybrid V8 4.0L 739Hp 2023>>
  • Porsche 9YA.2 Cayenne Turbo E-Hybrid Coupe V8 4.0L 739Hp 2023>>
  • Porsche 9YA.2 Cayenne Turbo E-Hybrid Coupe with GT Package V8 4.0 739Hp 2023>>
  • Porsche 976 Panamera GTS V8 4.0L 2023>>
  • Porsche 976 Panamera Turbo E-Hybrid V8 4.0L 2023>>
  • Porsche 976 Panamera Turbo S E-Hybrid V8 4.0L 2023>>

Diagram ref no 13

In high-output Porsche V8 engines, accurate fuel pressure delivery is essential for performance, emissions control and long-term engine reliability—making this tappet a critical service part.

What Does a High Pressure Fuel Pump Tappet Do?

The tappet converts the rotating motion of the camshaft into linear movement that actuates the high-pressure fuel pump. This process allows the fuel system to:
Maintain precise high fuel pressure

  • Support direct fuel injection under load
  • Ensure stable engine performance across the rev range
  • Optimise combustion efficiency and emissions

Without a properly functioning tappet, the fuel pump cannot operate correctly, leading to drivability and performance issues.

Why Do High Pressure Fuel Pump Tappets Fail?

Due to their location and function, fuel pump tappets are exposed to continuous mechanical contact, high loads and insufficient lubrication risk. Common causes of failure include:

  • Surface wear from camshaft contact
  • Breakdown of protective coatings
  • Oil contamination or reduced oil flow
  • Extended service intervals

Typical symptoms of tappet wear or failure include:

  • Loss of engine performance
  • Fuel pressure fault codes
  • Rough running or hesitation
  • Increased wear to the camshaft or fuel pump

Why Replace the Fuel Pump Tappet?

Replacing a worn tappet helps:

  • Restore correct fuel pressure delivery
  • Protect the camshaft and fuel pump from damage
  • Maintain smooth, consistent engine performance
  • Prevent costly fuel system or valvetrain repairs

Early replacement is particularly important on high-performance 4.0-litre Porsche engines where component wear can escalate quickly if ignored.6



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

PAC109311
PAC109311

The product you are viewing cross references to these numbers
Tappet High Pressure Fuel Pump. Porsche 976 Panamera 4.0ltr / 9YA.2 Cayenne 4.0ltr - PAC109311 - 711035310
2
Tappet High Pressure Fuel Pump. Porsche 976 Panamera 4.0ltr / 9YA.2 Cayenne 4.0ltr
PAC109311/1
Product Information
Product Information

High Pressure Fuel Pump Tappet
Sold each - 2 required per car

The high pressure fuel pump tappet is a precision-engineered component used in the direct-injection fuel system of Porsche 976 Panamera 4.0-litre models and 9YA.2 Cayenne 4.0-litre models. Positioned between the camshaft and the high-pressure fuel pump, this tappet transfers camshaft motion to drive the pump and generate the fuel pressure required for efficient combustion.

Fits:

  • Porsche 9YA.2 Cayenne S Coupe V8 4.0L 474Hp 2023>>
  • Porsche 9YA.2 Cayenne Turbo E-Hybrid V8 4.0L 739Hp 2023>>
  • Porsche 9YA.2 Cayenne Turbo E-Hybrid Coupe V8 4.0L 739Hp 2023>>
  • Porsche 9YA.2 Cayenne Turbo E-Hybrid Coupe with GT Package V8 4.0 739Hp 2023>>
  • Porsche 976 Panamera GTS V8 4.0L 2023>>
  • Porsche 976 Panamera Turbo E-Hybrid V8 4.0L 2023>>
  • Porsche 976 Panamera Turbo S E-Hybrid V8 4.0L 2023>>

Diagram ref no 13

In high-output Porsche V8 engines, accurate fuel pressure delivery is essential for performance, emissions control and long-term engine reliability—making this tappet a critical service part.

What Does a High Pressure Fuel Pump Tappet Do?

The tappet converts the rotating motion of the camshaft into linear movement that actuates the high-pressure fuel pump. This process allows the fuel system to:
Maintain precise high fuel pressure

  • Support direct fuel injection under load
  • Ensure stable engine performance across the rev range
  • Optimise combustion efficiency and emissions

Without a properly functioning tappet, the fuel pump cannot operate correctly, leading to drivability and performance issues.

Why Do High Pressure Fuel Pump Tappets Fail?

Due to their location and function, fuel pump tappets are exposed to continuous mechanical contact, high loads and insufficient lubrication risk. Common causes of failure include:

  • Surface wear from camshaft contact
  • Breakdown of protective coatings
  • Oil contamination or reduced oil flow
  • Extended service intervals

Typical symptoms of tappet wear or failure include:

  • Loss of engine performance
  • Fuel pressure fault codes
  • Rough running or hesitation
  • Increased wear to the camshaft or fuel pump

Why Replace the Fuel Pump Tappet?

Replacing a worn tappet helps:

  • Restore correct fuel pressure delivery
  • Protect the camshaft and fuel pump from damage
  • Maintain smooth, consistent engine performance
  • Prevent costly fuel system or valvetrain repairs

Early replacement is particularly important on high-performance 4.0-litre Porsche engines where component wear can escalate quickly if ignored.6



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

PAC109311
PAC109311

The product you are viewing cross references to these numbers
DISPLAYING 1 to 2 (of 2 products)
About Fuel Pumps

Fuel Pumps – Precision Fuel Delivery for Peak Porsche Performance

A fuel pump is the heart of your Porsche’s fuel delivery system, responsible for supplying pressurised fuel from the tank to the injectors or carburetors with pinpoint accuracy. It ensures consistent pressure and flow, allowing the engine to achieve smooth idling, rapid acceleration, and optimal fuel economy.

At Design911, we supply a full range of fuel pumps designed to meet the performance and reliability standards of Porsche vehicles — from classic air-cooled models to high-performance modern variants. Built from durable, corrosion-resistant materials with high-efficiency internal motors, our pumps deliver consistent flow rates even under demanding conditions, making them the ideal choice for both restoration and performance applications.

Whether you’re maintaining a 911, upgrading a Cayman GT4, or restoring a vintage 928, our manufacturer-quality fuel pumps ensure reliable performance, smooth starts, and consistent power delivery.

What Does a Fuel Pump Do?

The fuel pump is a critical part of your Porsche’s engine management system, delivering the correct volume and pressure of fuel to match the engine’s demands.

Core Functions:

  • Transfers fuel from the tank to the injectors or carburetors.
  • Maintains constant pressure, ensuring precise combustion.
  • Supports performance and efficiency across all RPM ranges.
  • Enables smooth engine starting and stable running.

An efficient fuel pump guarantees proper air-fuel ratios, cleaner combustion, and the signature responsiveness Porsche engines are known for.

Why Do Fuel Pumps Fail?

Fuel pumps are high-stress components that operate continuously under pressure, making them prone to wear and contamination over time.

Common Causes of Failure Include:

  • Fuel contamination from dirt, rust, or moisture in the tank.
  • Running low on fuel, causing overheating or cavitation.
  • Electrical connection issues leading to inconsistent voltage.
  • Internal motor wear or impeller damage from age.
  • Clogged filters or blocked lines, reducing pump efficiency.

Symptoms of a failing pump include engine hesitation, poor acceleration, long cranking times, loss of power, or stalling under load.

Why Replace with Precision-Engineered Fuel Pumps?

Replacing a worn or failing fuel pump restores reliable fuel pressure, smoother acceleration, and improved fuel efficiency. Our replacement pumps are built to match Porsche system tolerances, delivering dependable operation and extended lifespan.

Key Benefits:

  • Restores consistent fuel pressure and flow.
  • Improves performance and throttle response.
  • Prevents stalling, misfires, and starting issues.
  • Constructed with high-efficiency internal components.
  • Direct-fit design for easy installation and perfect compatibility.
  • Corrosion-resistant construction for long service life.

Ideal for both standard replacements and performance upgrades, these pumps ensure your Porsche’s fuel system performs at its absolute best.

Highlights:

  • Precision-engineered Porsche fuel pumps for all models.
  • Consistent fuel pressure for reliable engine operation.
  • Durable, corrosion-resistant construction.
  • Direct-fit replacement for easy installation.
  • Compatible with classic and modern Porsche vehicles.
  • Perfect for rebuilds, upgrades, or preventive maintenance.

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