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Fuel Pumps

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Rubber mount for rear fuel pump
This OE Match rubber mount is a replacement vibration isolator used to secure the rear fuel pump on Porsche 911 models from 1974 to 1989. It is designed to match the original-style fitment and helps hold the fuel pump securely while reducing vibration transfer to the body.
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Fits:
Porsche 911 1974 - 1979 (2 pcs per car)
Porsche 911 Turbo 1975 - 1989 (3 pcs per car)

Diagram ref no 6

The rubber mount supports the fuel pump in its mounting position and helps absorb vibration generated by pump operation and vehicle movement. It keeps the pump correctly located, reduces noise, and helps protect the fuel pump and mounting bracket from excess stress.

Functions
Secures the rear fuel pump to its mounting bracket
 Helps isolate fuel pump vibration from the body
 Reduces fuel pump noise and resonance
 Supports correct pump alignment and fitment
 Helps protect fuel lines and pump fittings from movement stress
 Replaces perished, cracked, loose, or missing original rubber mounts
 OE Match replacement for fuel system repair or restoration.

Why Replace This Part?
Rubber fuel pump mounts can harden, crack, split, collapse, or detach with age, fuel exposure, heat, and road vibration. A worn mount may allow the fuel pump to move, vibrate, or create extra noise, and can place stress on fuel lines and electrical connections. Replacing the mount helps restore secure fuel pump installation and quieter, more reliable operation.

When to Replace This Part
•  The fuel pump mount is cracked, perished, split, or missing
•  The fuel pump feels loose or moves on its bracket
•  There is increased fuel pump noise or vibration
•  The rear fuel pump or fuel lines are being replaced
•  The mounting hardware has been removed during fuel system service
•  Fuel pump alignment or bracket security needs to be restored
•  The vehicle is undergoing classic Porsche fuel system restoration.

Where it fits on the car
This rubber mount fits at the rear fuel pump mounting point, securing the fuel pump to its bracket or body mounting area. It forms part of the fuel pump support assembly on Porsche 911 models using a rear-mounted fuel pump arrangement.

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Related, superseded, cross reference or alternative numbers for comparison.

99970338401
99970338400
99970338401
99970330100
99970330200
91160820300

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99970338401
Product Information
Product Information
Rubber mount for rear fuel pump.
Sold each.

porsche

Fits:
Porsche 911 1974-79 (2 pcs per car)
Porsche 911 Turbo 1975-89 (3 pcs per car)

Click 'Zoom in' for large parts diagram.
Diagram ref no 6

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

99970338401
99970338400
99970338401
99970330100
99970330200
91160820300

The product you are viewing cross references to these numbers
DISPLAYING 17 to 18 (of 18 products)
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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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