Fuel Sender Technology


Simple, Accurate & Reliable.

Our advanced fuel sensors, a cutting-edge fuel measurement solution, are driven by better sensor technology. These sensors represent a significant improvement in the way fuel is measured, offering a more reliable and precise option for your needs.

Patented Design

At the heart of our fuel level senders lies our proprietary Magnetic Field Sensor technology, exclusively patented by CiES Inc. This technology harnesses the unique electrical properties exhibited by certain ferromagnetic alloys, such as permalloy, when exposed to external magnetic fields. Leveraging this phenomenon, our sensors can accurately measure angles by incorporating a magnet at the pivot point.

The practical application of this technology can be likened to a compass, where the "North" is represented by the float positioned on the fuel's surface. Just like a compass consistently points to magnetic North, our fuel level sender continually indicates the exact location of the float, regardless of any movement in the fuel's position.

With such precision and reliability, our fuel level senders promise to revolutionize fuel measurement processes, offering an unparalleled solution for various industries. Trust CiES Inc. to provide you with a state-of-the-art fuel measurement option that brings together innovation and accuracy seamlessly.

Learn more about our product construction here.

Precision & Longevity

The CiES digital fuel quantity senders combine advanced sensor technology with patented innovations to ensure precise and consistent fuel measurement in aircraft tanks. This system sets a new standard for accuracy, allowing for repeatable measurements with an impressive level of precision. In fact, our patented sensor system enables fuel level measurements down to changes as small as 0.03 of an inch, representing significantly less than 10ths of a gallon of AVGAS or Jet A. It's precision at its finest!

What's even better is that our non-contact measurement method ensures a lifetime of reliable operation. You can count on our system to consistently provide accurate fuel level outputs in the cockpit, complemented by modern digital fuel indication. With CiES, you can trust that your fuel measurement needs are met with the utmost reliability and technological excellence.

Check out the hundreds of aircraft models already FAA-approved to install CiES senders here.

How are CiES fuel senders better?

In the realm of fuel measurement, magnetic technology has emerged as a groundbreaking solution, revolutionizing the accuracy and efficiency of this critical calculation. Our cutting-edge approach utilizes Magnetic Field Sensor technology, which has proven revolutionary for industries relying on precise fuel measurement, such as aviation, automotive, and marine sectors. The reliability, precision, and accuracy offered by measuring fuel with magnetic technology underscores its ability to redefine fuel management systems.

One of the key advantages of employing magnetic technology for fuel measurement is its inherent reliability. This is primarily attributed to the non-contact measurement method, which ensures minimal wear and tear over time. Traditional fuel measurement systems reliant on mechanical components are prone to degradation and inaccuracies due to friction and mechanical failures. In contrast, magnetic technology eliminates physical contact with the fuel, significantly reducing the likelihood of sensor deterioration and ensuring consistent performance throughout the lifespan of the system (not to mention hazards of electronics in the tank). This inherent reliability translates to increased operational efficiency and decreased maintenance requirements, offering businesses a dependable and long-lasting fuel measurement solution. Check out a comparison of magnetic resonance technology vs. resistance here.

Accurate fuel measurement is indispensable for decision-making processes and regulatory compliance across various industries. Magnetic technology shines in delivering superior accuracy in fuel measurement due to its high-tech sensor system, which is finely calibrated to detect the slightest variations in magnetic fields caused by changes in fuel levels. As a result, the fuel level outputs provided by this technology consistently align with actual fuel quantities, leaving no room for discrepancies or errors. The ability to rely on precise and accurate fuel measurements empowers pilots to make informed decisions, optimize logistics, and maintain compliance with stringent industry standards. Find a comparison of magnetic resonance technology vs. ultrasonic here.

Measuring fuel with magnetic technology heralds a new era of reliability, precision, and accuracy in fuel management. By leveraging Magnetic Field Sensor technology, this innovative approach minimizes wear and tear, ensuring a lifetime of dependable performance. The exceptional precision of the system allows for meticulous fuel management, while its accuracy guarantees alignment between measured and actual fuel quantities. As pilots and companies seek ever more sophisticated fuel measurement solutions, magnetic technology stands at the forefront, offering a transformative and indispensable tool for enhanced operational efficiency and safety. View all the charts of magnetic technology versus other sytems here.

Do magnetic fuel senders degrade over time?

Our magnetic resonance fuel senders are self-cleaning due to generous clearances that do not effect system accuracy.

Can magnetic resonance fuel sensor technology be trusted?

In other words, is this technology reliable and has it been tested? Yes! CiES exceeds 90,000 hrs. mean time to failure (MTTF) making our fuel quantity one of the most reliable aviation systems in existence. And with over 100,000 fuel senders installed (and specified with new aircraft manufacturers as well), you can trust the install data as well.

Do you want to purchase new fuel senders for your aircraft? The FAA has approved nearly 700 models on our STC. Buy them here.

The most accurate fuel senders I’ve ever had in a piston single! The ones in my SF.260 work with a Garmin EIS system.

- David Tan
SAIA Marchetti SF.260

cies fuel tank senders

My plane... was the first Beech single to get CiES senders. Mine are interfaced with an EDM930. Over four years since the install, and I'm still 100% satisfied.

Brace yourself for an excellent customer service experience, an awesome, precise, [and] reliable product, and years and years of dependable and accurate fuel quantity indicators.

- John Hefley
Beechcraft B33 Debonair

red and gold fuel senders compared to an OEM sender

I have installed CIES fuel senders on my Twin Comanche in conjunction with a JPI960.  I am very pleased.  They work great.  I am confident in my fuel gauges for the first time since I have owned the plane (30 years).

- Trace Blakely
Piper PA-30 Twin Comanche

CiES Fuel Senders


Our fuel senders are constructed with hard anodized aluminum with a Teflon coating. A 2011-T3 Aluminum arm and other high-quality components round out these superior fuel level sensors.

CiES Fuel Senders

Installation Instructions

For general installations, you can download installation instructions in pdf format or use our online installation instructions index to go directly to the desired section. If you have a Cessna Twin, there are special installation instructions for this application.


Next Generation Can Trust Their Fuel Gauges.

We’re committed to providing an accurate, safe and reliable fuel level reading, as well as providing you with the highest level of service. Once you have installed magnetic field fuel sensing, your fuel level sensing problems will be solved. When you see the difference, you’ll always choose us for your fuel and liquid level sending needs.