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Fuel Gauge / Level Sender

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64420180108
Product Information
Product Information
Tank level sensor for fuel tank with tank level sensor opening at the top.

Fits:
Porsche 356 B (1961 - 1963) *Only for T6 with Fuel tank level sensor opening at the top
Porsche 356 C (1963 - 1965)

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Related, superseded, cross reference or alternative numbers for comparison.

64420180108
64420180107
64420180108
1615800400

The product you are viewing cross references to these numbers
64420180100/1
Product Information
Product Information
Fuel Level Sender - Top mounted
This Fuel Level Sender is an OE-style top-mounted fuel tank sending unit designed for Porsche 356B T5 models. It measures the fuel level inside the tank and sends the corresponding signal to the dashboard fuel gauge.

Fits:

Porsche 356B T5 1.6L 01/1959 - 08/1961

Diagram Ref No 37

Manufactured to OE specifications, it is engineered to provide accurate fuel level readings while maintaining factory-correct fitment and electrical compatibility.

Installed vertically into the top of the fuel tank, the sender unit uses a float-operated internal mechanism that rises and falls with the fuel level. As the float moves, the sender changes electrical resistance values, transmitting an accurate fuel level signal to the dashboard gauge. Proper operation is essential for reliable fuel level indication and preventing inaccurate readings or unexpected fuel shortages.

This component is ideal for restoration projects, fuel system refurbishment, or replacement of worn or faulty original sender units.

The fuel level sender monitors the fuel level inside the fuel tank and transmits an electrical signal to the dashboard fuel gauge. This allows the driver to accurately monitor remaining fuel while driving.

Function
•  Measures fuel level within the fuel tank
•  Sends electrical signal to dashboard fuel gauge
•  Provides accurate fuel level indication
•  Supports reliable fuel monitoring while driving
•  Maintains compatibility with original gauge system

Over time, fuel level senders can wear internally due to corrosion, fuel contamination, electrical contact deterioration, or float failure. A faulty sender may cause inaccurate fuel readings, erratic gauge movement, or complete fuel gauge failure. Replacing the sender restores reliable fuel level indication and helps prevent unexpected fuel shortages or incorrect gauge readings.

When to replace
•  Inaccurate or fluctuating fuel gauge readings
•  Fuel gauge remains empty or full constantly
•  Intermittent fuel gauge operation
•  Corrosion or damage to sender unit
•  During fuel tank restoration or fuel system servicing

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

64420180100
64420180100

The product you are viewing cross references to these numbers
64420180108/1
Product Information
Product Information
Fuel level sender - Top mounted
A top-mounted fuel level sending unit that measures the amount of fuel in the tank and communicates that level to the dash gauge through an electrical resistance signal.

Fits:

Porsche 356B T6 / 356 C 1.6L 09/1961 - 12/1965

The fuel sender accurately measures the fuel level using a calibrated float and rheostat, delivering stable and precise readings to the dashboard gauge. It restores proper gauge function when readings become inaccurate or erratic, and ensures a secure, leak-free seal at the tank opening to maintain overall fuel-system integrity.  

Original senders often fail due to:
• Float saturation or sinking
• Corroded rheostat contacts
• Broken or worn internal resistance wires
• Sticking float arms Poor sealing causing fuel odour or seepage
• A faulty sender leads to inaccurate readings, gauge fluctuation, or a non-functional fuel gauge - a significant inconvenience on a classic car.

Replacing it restores reliable fuel-level monitoring and helps maintain driving confidence.

When to Replace -  Install a new sender if:
•  The gauge reads empty or full constantly
•  Fuel level fluctuates or behaves erratically
•  The float has become saturated or deteriorated
•  The sender shows corrosion or internal wear
•  You are restoring or servicing the fuel tank

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

64420180108
64420180107
64420180108

The product you are viewing cross references to these numbers
64420180106/1
Product Information
Product Information

OE Match fuel level sender for Porsche 356B T6 1.6L models with a bottom-mounted tank sender. A gasket is included with the unit.

Fits

  • Porsche 356B T6 1.6L - 08/1961-12/1963

Check fitment for your specific vehicle (model, year, engine) before ordering.

Diagram ref no: 41

What This Product Does

The sender detects the fuel remaining inside the tank and provides an electrical signal to the dashboard gauge. It serves the fuel indication system rather than pumping fuel or controlling its delivery to the engine.

Functions

  • Detects changes in tank fuel level.
  • Supplies the signal used by the dashboard fuel gauge.
  • Allows the driver to monitor the remaining fuel.

Technical Details

  • Brand: OE Match.
  • Mounting arrangement: bottom-mounted fuel tank sender.
  • Supplied references: 64420180106 and 1615800600.
  • Engine application: 1.6L.
  • Application dates: August 1961 to December 1963.
  • Included component: sender gasket.

Symptoms of Fault

  • The gauge remains at empty or full despite changes in fuel quantity.
  • The needle moves abruptly or gives intermittent readings.
  • Refuelling produces little or no change in the indicated level.
  • Readings vary with vibration or temperature.
  • Sender terminals show corrosion, or fuel odour is traced to the sealing area.

Why Replacement Matters

A defective sender can make the displayed fuel quantity unreliable. Once diagnosis confirms the unit is responsible, replacement addresses the faulty indication. Inspect the wiring, earth connections and gauge first, since faults elsewhere can produce similar behaviour. During tank refurbishment, also examine the sender mounting surface and sealing area.

FAQs

Does an incorrect reading prove the sender has failed?
No. Poor connections, damaged wiring, an inadequate earth or a gauge fault can also affect the display.

Will replacing this unit correct fuel delivery problems?
Its purpose is fuel-level indication. Starting or running faults require separate diagnosis.

Is a sealing gasket supplied?
Yes. The sender includes a gasket; inspect the mating surface when fitting it.

What should be checked before selecting it?
Confirm the T6 application, production dates, supplied references and bottom-mounted sender arrangement against the vehicle.



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

64420180106
64420180106

The product you are viewing cross references to these numbers
DISPLAYING 1 to 4 (of 4 products)
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About Fuel Gauge / Level Sender

Fuel Level Sender Units – Accurate Fuel Readings for Reliable Porsche Performance

A fuel level sender unit is a critical component in your Porsche’s fuel system, designed to monitor the amount of fuel in the tank and transmit that data to your dashboard gauge. It ensures accurate readings, helping drivers manage fuel efficiency and avoid running dry.

At Design911, we offer a wide selection of fuel level sender units developed for Porsche models across generations — from classic air-cooled icons to modern performance cars. Each unit is crafted to deliver accurate resistance readings, durable performance, and seamless electrical compatibility, ensuring your dashboard gauge provides dependable fuel level information.

Our high-quality sender units are built to withstand fuel exposure, temperature changes, and vibration, restoring accuracy and reliability to your vehicle’s instrumentation.

What Do Fuel Level Sender Units Do?

The sender unit is responsible for measuring fuel level inside the tank and communicating that information to the gauge via a variable resistor or electronic sensor.

Core Functions:

  • Measures fuel level using a float and resistance-based signal.
  • Transmits real-time data to the dashboard fuel gauge.
  • Ensures accurate monitoring for efficient driving and trip planning.
  • Maintains correct communication within the vehicle’s fuel system.

Without a properly functioning sender unit, your Porsche’s fuel gauge can become unreliable — leading to false readings and unnecessary refuelling anxiety.

Why Do Fuel Level Sender Units Fail?

Fuel level sensors operate constantly within harsh conditions — submerged in fuel and exposed to varying temperatures and vibration. Over time, they can deteriorate, resulting in erratic or inaccurate readings.

Common Causes of Failure Include:

  • Wear and corrosion on electrical contacts or float arms.
  • Contaminated or degraded fuel, causing internal residue buildup.
  • Float leakage or disintegration, affecting buoyancy and measurement.
  • Electrical short circuits or open circuits due to connector fatigue.
  • Age-related material breakdown in older Porsche models.

Symptoms of a failing sender include stuck or fluctuating gauges, inaccurate readings, or a fuel light that remains on or off constantly.

Why Replace with Precision-Engineered Sender Units?

Installing a precision-fit replacement fuel sender unit restores the accuracy of your Porsche’s fuel gauge, ensuring dependable readings and maintaining the integrity of your fuel management system.

Key Benefits:

  • Restores accurate dashboard readings for fuel monitoring.
  • Eliminates erratic gauge behaviour or warning light faults.
  • Enhances reliability during long drives and performance use.
  • Crafted from corrosion-resistant, fuel-safe materials.
  • Direct-fit compatibility for quick and precise installation.
  • Designed to match Porsche performance standards.

Whether part of a restoration or routine service, a new sender unit ensures confidence every time you hit the road.

Highlights:

  • High-precision Porsche fuel level sender units for classic and modern models.
  • Durable, corrosion-resistant materials for long-term accuracy.
  • Restores communication between tank and gauge.
  • Direct-fit design for easy installation and reliable operation.
  • Ensures accurate fuel readings and system integrity.
  • Perfect for maintenance, restoration, or upgrades.

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