Fuel Distributor / Metering Head

Fuel Distributor / Metering Head – Precision Fuel Delivery for Porsche CIS & Injection Systems

The fuel distributor, also known as the fuel metering head, is the central component of Porsche’s Continuous Injection System (CIS) or K-Jetronic fuel delivery setup. Its primary role is to measure and distribute the correct volume of fuel to each cylinder, ensuring smooth combustion, consistent performance, and optimal fuel economy.

At Design911, we offer a wide range of precision-engineered fuel distributors and metering heads that meet exact performance and durability standards. Each unit is meticulously calibrated to provide accurate fuel metering across the rev range, ensuring reliable operation under all driving conditions.

Whether restoring a classic 911, servicing a 928, or rebuilding a transaxle-era Porsche, our high-quality components deliver the precision fuel control needed for consistent performance and throttle response.

What Does a Fuel Distributor / Metering Head Do?

The fuel distributor is responsible for regulating the amount of fuel delivered to each cylinder based on air intake and engine demand. It maintains consistent pressure and flow balance to achieve ideal combustion.

Core Functions:

• Distributes fuel evenly to each injector line.
  
• Regulates pressure and flow within the fuel injection system.
  
• Ensures balanced air-fuel mixture for all cylinders.
  
• Supports smooth acceleration, idle stability, and power output.

A properly functioning metering head ensures your Porsche engine maintains precise fuel control, which directly affects drivability, emissions, and fuel economy.

Why Do Fuel Distributors Fail?

Although built for longevity, fuel distributors operate in a high-pressure environment and can degrade over time due to fuel contamination, corrosion, or mechanical wear.

Common Causes of Failure Include:

• Internal seal deterioration, leading to fuel leakage or imbalance.
  
• Contaminated fuel, causing blockage or sticking plungers.
  
• Corrosion and varnish deposits inside metering chambers.
  
• Pressure regulator failure, disrupting consistent fuel flow.
  
• Age-related wear, especially in classic and air-cooled Porsche engines.

Symptoms of a failing distributor include rough idling, poor throttle response, hesitation, misfires, or hard starting, particularly when warm.

Why Replace with Precision-Calibrated Fuel Distributors?

Installing a high-quality replacement or remanufactured fuel metering head restores proper fuel balance, ensuring your Porsche runs as smoothly and responsively as it did when new. Each unit is tested and calibrated to exact flow tolerances for reliable performance.

Key Benefits:

• Restores precise fuel metering and pressure regulation.
  
• Eliminates hesitation, rough idling, and misfires.
• Improves throttle response and engine smoothness.
• Supports better fuel economy and reduced emissions.
• Crafted from high-grade materials for corrosion and pressure resistance.
  
• Direct-fit compatibility for classic CIS and K-Jetronic systems.

Whether part of a full restoration or routine service, replacing the metering head ensures consistent performance and protects other vital components in the fuel system.

Highlights:

• Precision-engineered Porsche fuel distributors and metering heads.
• Calibrated for accurate flow and pressure control.
• Restores performance in K-Jetronic and CIS-equipped engines.
• Manufactured using corrosion-resistant alloys for long service life.
• Direct replacement for classic 911, 928, and 924 models.
• Perfect for restorations, rebuilds, and performance maintenance.