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Beechcraft Physical Bolt-In Fuel Sender Replacements
CiES fuel level senders are a physical bolt-in replacement for Beechcraft Aircraft fuel tank quantity. They are applicable to most Beechcraft models. Here you’ll find the models covered by the current FAA STC.
Please note: CiES fuel senders require a power wire for operation.
The complex sender circuitry in a CiES fuel sensor requires an extra wire to operate. For general installations, you can download installation instructions in pdf format.
Unless otherwise specified, we support 30+ fuel gauges and instrument panels. These are also covered by the STC. If you require support for an existing gauge (aircraft must have a tank and gauge map), please contact us for details before ordering.




Note: Not all parts shown are included with every sender. Images are for illustrative purposes only. Please refer to your order confirmation or contact our sales team to verify the exact components included in your shipment.
DISCOVER
Beechcraft Fuel Senders
Product Details
The CiES digital fuel senders use a high technology sensor system that allows repeatable accurate measurement of fuel in aircraft tank. This advanced technology and patented sensor system allows fuel measurements down to a change in fuel level to less than 0.03 of an inch. This measurement represents much less than 10ths of a gallon of AVGAS or Jet A. The non-contact measurement method insures a lifetime of operation providing the same consistent fuel level output in the cockpit with modern digital fuel indication.
Available Downloads
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Model 19 Musketeer Sport
(19A, B19, M19A)
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Model 23 Musketeer/Custom
(23, A23, A23A, A23-19, A23-24, B23, C23 )
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Model 24 Sierra
(A24, A24R, B24R, C24R)
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Model 33 Debonair/Bonanza
(35-33, 35-A33, 35-B33, 35-C33, 35-C33A, E33, E33A, E33C, F33, F33A, F33C, G33)
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Model 35 Bonanza
(35, A35, B35, C35, D35, E35, F35, G35, 35R, H35, J35, K35, M35, N35, P35, S35, V35, V35A, V35B, 36, A36, A36TC, B36TC, G36)
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Model 36 Bonanza
(36, A36, A36TC, B36TC, G36)
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Baron 55
(4B95A, D95A, E95, 95-55, 95-A55, 95-B55, 95-B55A, 95-B55B (T-42) , 95-C55, 95-C55A, D55, D55A, E55, E55A)
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Baron 56
(56TC, A56TC)
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Baron 58
(58, 58A, 95, B95, 58P, 58PA, 58TC, 58TCA, G58)
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Model 76 Duchess
(76)
Item | Cockpit Display Manufacturer | Cockpit Display Model | Data Converter (LRU1) | Fuel Sender Output Capability | Instrument Input Capability |
---|---|---|---|---|---|
1 | JP Instruments | EDM 900 | N/A | Voltage 0-5 VDC | 0-4.7 VDC |
2 | JP Instruments | EDM 930 | N/A | Voltage 0-5 VDC | 0-4.7 VDC |
3 | JP Instruments | EDM 900 | N/A | Digital Frequency 64Hz-10kHz | 0-100 kHz |
4 | JP Instruments | EDM 930 | N/A | Digital Frequency 64Hz-10kHz | 0-100 kHz |
5 | Electronics International | MVP-50 | EDC-33P | Voltage 0-5 VDC | 0-18 VDC |
6 | Electronics International | CGR-30 | EDC-33P | Voltage 0-5 VDC | 0-18 VDC |
7 | Electronics International | MVP-50 | EDC-33P | Digital Frequency 64Hz-10kHz | 0-6 kHz |
8 | Electronics International | CGR-30 | EDC-33P | Digital Frequency 64Hz-10kHz | 0-6 kHz |
9 | Ultra FEI | Auracle CRM2120 | N/A | Voltage 0-5 VDC | 0-5 VDC |
10 | Aerospace Logic | FL25X | N/A | Voltage 0-5 VDC | 0-5 VDC |
11 | Aerospace Logic | FL20XD | N/A | Digital Frequency 64Hz-10kHz | 10-300 Hz |
12 | Aerospace Logic | FL21X | N/A | Voltage 0-5 VDC | 0-1 VDC |
13 | Aerospace Logic | FL20X | N/A | Voltage 0-5 VDC | 0-1 VDC |
14 | Garmin | G1000 | GEA 71 | Voltage 0-5 VDC | 0-5 VDC |
15 | Garmin | G950 | GEA 71 | Voltage 0-5 VDC | 0-5 VDC |
16 | Garmin | G1000 | GEA 71 | Voltage 0-5 VDC | 0-1 VDC |
17 | Garmin | G950 | GEA 71 | Voltage 0-5 VDC | 0-1 VDC |
18 | Garmin | G1000 | GEA 71 | Digital Frequency 64Hz-10kHz | 0-100 kHz |
19 | Garmin | G950 | GEA 71 | Digital Frequency 64Hz-10kHz | 0-100 kHz |
21 | JP Instruments | EDM 960 | EDM 950 | Voltage 0-5 VDC | 0-4.7 VDC |
22 | JP Instruments | EDM 960 | EDM 950 | Digital Frequency 64Hz-10kHz | 0-100 kHz |
23 | Garmin | G500/G600 Txi | GEA 110 | Voltage 0-5 VDC | 0-5 VDC |
24 | Garmin | G500/G600 Txi | GEA 110 | Digital Frequency 64Hz-10kHz | 0-30,000 Hz |
25 | Garmin | G2000 | GEA 71 | Voltage 0-5 VDC | 0-1 VDC |
30 | Garmin | G3X | GEA 24 | Digital Frq 64Hz-10kHz, Vlt 0-5 VDC | 0-100 kHz, 0-5 VDC |
31 | Dynon | Skyview HDX | N/A | Voltage 0-5 VDC | 0-5 VDC |
32 | Garmin | GI 275 | GEA 24 | Digital Frq 64Hz-10kHz, Vlt 0-5 VDC | 0-100 kHz, 0-5 VDC |
General Specification
TSO-C55a
Floats, arm lengths, and travel angles vary depending on tank dimension and application.

Accuracy Range
Angular Travel Range of Sensor
0.18° CiES between angular steps.
1024 Discreet points over 180° swing.

Temperature
Operating Temp Range
-55° to 85° Celsius (C)
-67° to 185° Fahrenheit (F)
Voltage
Operating Voltage Range
9–28 VDC
Signal Output Options
Frequency/Resistance/Voltage
Output Type | Signal | Range | Output Range | Formula | Rise Time |
---|---|---|---|---|---|
Temperature | Output to be the following: | ||||
Option 1 | 0-5 Vdc Square Wave | -50°C to 50°C -58°F to 122°F | FREQ 1,200Hz - 490Hz | Temp = 123 - (87,252.07 / Frequency) | 105nS |
Fuel Level | Output to be one of the following: | ||||
Opt 1 Frequency | 0-5 Vdc Square Wave | 5° - 175° Angular Travel | FREQ 16,384Hz - 64Hz | FREQ (Hz) = 65,538 / (4 + (Deg * 5.6889)) | 115nS |
Opt 2 Resistance | Resistance 0 - 280 Ohm | 5° - 175° Angular Travel | Resistance 0 - 280 Ohm | ||
Opt 3 Voltage | Voltage 0 - 5 Vdc | 5° - 175° Angular Travel | Voltage 0 - 5 Vdc |
Mounting & Installation
CiES Fuel Senders
CiES senders are designed to be a side or top mount configuration. Torque screws 18-22 inch-pounds (in lb) using a crossing pattern.
Warning: Over-torquing or using a circular pattern may cause “damage” to gasket and/or sender.
Note: Hardware is “NOT” supplied with senders unless requested. We recommend AN, AS, NAS, MS or equivalent hardware.

SAE AS405c
CiES Fuel Senders
3.1.1 | Materials | 5.5 | Position |
3.1.2 | Workmanship | 5.6 | Test Liquid |
3.2 | Identification | 6.1 | Scale Error |
3.3.1 | Temperature | 6.2 | Friction |
3.3.2 | Humidity | 6.3 | Leak Test |
3.3.3 | Vibration | 6.4 | Position Error |
3.3.4 | Altitude | 6.5 | Power Variation |
3.3.5 | Fire Hazard | 6.6 | Dielectric |
3.3.6 | Seal | 6.7 | Maximum Operating Temp |
3.4 | Radio Interference | 7.0 | Qualification Tests |
3.5 | Magnetic Effect | 7.1.1 | Low Temperature |
4.3 | Power Variation | 7.1.2 | High Altitude – Low Temp |
4.4 | Power Indication | 7.3 | Vibration |
4.5 | Tank Moving Parts | 7.3.1 | Resonance |
4.6 | Filling Medium | 7.3.2 | Cycling |
5.1 | Atmospheric Conditions | 7.4 | Humidity |
5.2 | Vibration | 7.5 | Magnetic Effect |
5.3 | Vibration Equipment | 7.6 | Sealing |
5.3.1 | Linear Motion Vibration |
DO-160
Environmental
The TSO article meets the minimum operation performance standard requirements (MOPS) for TSO C55a.
Environmental Qualification Per RTCA/DO-160(F) | ||
---|---|---|
4.0 | Temperature & Altitude | B2 |
5.0 | Temperature Variation | B |
6.0 | Humidity | B |
7.0 | Operational Shocks | A |
8.0 | Vibration | S (M) |
9.0 | Explosive Atmosphere | E1,2 |
15.0 | Magnetic Effect | Z |
16.0 | Power Input | B |
17.0 | Voltage Spike | B |
18.0 | Audio Frequency Susceptibility | B |
19.0 | Induced Signal Susceptibility | ZC |
21.0 | Emission of Radio Frequency Energy | L |
25.0 | Electrostatic Discharge | A |
There is a current lead time of 3-4 weeks. If you have an AOG situation, we may be able to rush your order for an additional fee. Please call 541-977-1043 for more information.
We do ship globally. When placing your order, you may select from the following shipping options:
- Ground - Lower 48
- 2nd Day Air
- Next Day Air
- Canada
- Australia
- South Africa
- Other International
- Your shipping account
CiES Inc. warrants all parts in your new fuel level transducers to be free from defects in material and workmanship under normal use. Our warranty is limited to repair or exchange for the original purchaser. Part(s) must be returned, shipping prepaid, within five years of the original purchase date. Installation labor is the responsibility of the aircraft owner.
Under this warranty, CiES Inc. is not responsible for any service charges, including removal, installation, nor any other consequential damages. This warranty is void on any product which has been subject to misuse, accident or damage caused by negligence. This may include mis-wiring or altering the units without the written guidance of a member of the CiES team. Upon inspection of returned units, CiES will determine if any of the aforementioned are found to be the cause of failure and charge for refurbishment accordingly.
Most issues present during install can be avoided by a strict adherence to our current installation manual. If you have further questions about installation, they can be solved by our team of friendly technical support specialists. If our specialists are unable to solve the installation issue, they will provide an RMA Work Order for returning your units. This number must be present on and inside your package. If the cause of failure is determined to be the result of manufacturing defects or workmanship, your units will be shipped expedited to the address found on the RMA work order at no cost to you. If the failure is a result of misuse or negligence from the installer, the units will be shipped back at the speed you requested and billed to the customer named on the RMA work order.
For uninstalled, unaltered, new parts returned to stock, CiES Inc. will charge a flat $20 restocking fee per unit. Please contact us should you need to replace or return CiES products.
Our Customers Say It Best
We are so impressed with our fantastic senders! Thank you.
Vince Remcho
Beechcraft V35B Bonanza
I have the CiES senders with the Aerospace Logic gauge in my A36. Very satisfied with the installation. I believe you actually can use CiES senders with the existing gauges, but to me it was worth it to upgrade to the full digital implementation.
Lee Wenninger
Beechcraft A36TN Bonanza
CiES digital senders installed along with a JPI 930 in December 2018. You won't look back. They perform flawlessly and are within 0.3 gallons of the estimated remaining when I refuel.
James Kapantais
Beechcraft B33 Debonair
I had four CiES senders and an Aerospace Logic quantity gauge installed in my 79' Beechcraft B55 Baron. It was roughly $2200 for the parts and I'm guessing ten hours of labor.
The accuracy is incredible with new digital gauges. After burning 100 gallons of Avgas, I am within 1 gallon between fuel quantity gauge, JPI fuel totalizer value, and what gets pumped in by the fuel truck. I can now very accurately fuel for weight considerations and be confident of my remaining fuel, even as it gets down to less than 10 gallons in each tank. My original fuel gauges were useless as far as I was concerned. I went off fuel flow and time, which works well but will never tell you if you have a leak. Cross checking between two independent sources is better than one. I never want to be flying and not know exactly how much fuel I have.
Worth every dollar spent to me. It's a fairly simple install and both companies have excellent customer service and support. They both answered all my annoying questions.
If you are going to pull and repair something, just replace it with equipment that is so much better.
Verified Purchaser
Beechcraft B55 Baron
If your airplane is down for an upgrade, I would send your old fuel senders to CiES. This will ensure that the senders are appropriately set up the first time. Beechcraft, in all of their wisdom, made numerous different senders, inverting the bolt patterns on some, etc.
Verified Purchase
Beechcraft
My partners and I spent a lot of money upgrading our panel. The feature that increased my flying enjoyment the most was adding CiES fuel senders and real time electronic display. My wife always had the side eye when I was tracking fuel status and switching tanks. Now that she can instantly see fuel levels, it makes her a more willing co-pilot.
Stuart Taylor
Debonair C33
My plane's a Deb, not an A36. It was the first Beech single to get CiES senders. Mine are interfaced with an EDM930. It's been over four years since the install, and I'm still 100% satisfied. I'm an enthusiastic fan and supporter of the senders, CiES and Scott Philiben.
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
The cost to retrofit CiES senders to a pre-74 B55 is around $3200 (plus installation). That may seem "outrageous," but it's only about 50% more than what it costs to have the eight (2 per tank * 4 tanks) senders "overhauled." And my experience with overhauled senders is not very good. At best, the overhauled senders will perform as good as when new for a few years – which is to say they're accurate to within about +/- 5 gallons.
Properly calibrated the CiES senders appear to be within one gallon. In a Bonanza with two 40 gallon tanks, or a post 1973 Baron, there are only four senders so that cost is cut in half.
The last time I checked, new (1940s technology based) senders from Beech were around $1,600 each or over four times what CiES charges.
Verified Purchase
Beechcraft B55 Baron
I was the first sender/gauge install for my shop. Charged 40 hrs. labor for install. (They said it was very simple and straight forward).
I asked every member of the shop to watch the YouTube video from Aerospace Logic for the calibration process. It's actually easy to do. As with everything, garbage in = garbage out.
One of my most valuable installs. Nothing better than knowing, DOWN TO THE 1/10th gallon, how much gas you have.
As far as Aerospace Logic goes... Outstanding product. Aerospace Logic service is interesting. Overall, no regrets.
Verified Purchase
Beechcraft K35 Bonanza
Extremely accurate! My line guys take bets when I fuel up as to what my “used” value is and what they can squeeze in the tanks. I always win!
Rick Hock
Beechcraft F33A Bonanza
I did the CIES-G3X calibration with my A&P, and we were able to get 39 gal into the tanks after putting in 3 gallons of unusable fuel (this was 0.0 in the calibration table). If you still have capacity beyond 37 gallons, you have to decide what to do. You can either flatten off the calibration curve at 37 or you can add another point or two. I added points for 38 and 39 gallons. If you do the former, you’ll have to burn a couple of gallons before you see any movement on the G3X gauge. Sounds like your shop did exactly the same as I did.
The digital senders connected to a glass panel offer precision that was unimaginable when my bonanza rolled off the assembly line with resistive floats and a small analog gauge.
As it turns out 74 gallons was conservative and we can actually get more in the tanks on a cool day. Whether you account for the extra weight (36 pounds for my situation) at station 75 in you W&B is up to you. I rarely operate near the boundaries of the envelope so I usually ignore the extra few gallons in my W&B (plus I have Foreflight W&B set up with 74 gallons [444 lbs] and have never changed it).
Bottom line, my fuel order is to the tabs, slots, or to the top, and I almost always top them off. Consistency of gauge readings and fuel totalizer/flow meter gives confidence in readings and fuel onboard during flight. Before resetting the Fuel Calculator, I’ll note the fuel used and compare to what was added. It is usually within 0.1 gallon. Amazing precision.
Eric Paterson
Beechcraft Bonanza
The Aerospace Logic 'FL20xD' gauges and CiES sender combo is a superior and accurate solution to fuel level monitoring. Very happy with my install!
Verified Purchase
Beechcraft A36TN Bonanza
Maybe I am an oddball. I just cannot imagine why any pilot would not want super accurate fuel gauges. Putting dollars aside, that seems like a no-brainer to me. My brother, Kurt and I met with Scott and got the pitch at Oshkosh last summer. I think he has done a tremendous service to GA with the development of CiES fuel senders and have put them on my list of "to-dos" for my Baron. Kurt has already put them in his Bonanza and is very happy with the result.
Verified Purchase
Beechcraft B55 Baron
We installed the digital CiES fuel senders during recent avionics upgrades. Along with the fuel senders, we tied them into the Garmin 500EIS.
[It's] been almost six months and [we] really like them. We use the 500EIS calibration feature after almost every flight and rarely are we off by more than 0.05 gal - more often, the difference is 0.
Noel A. Poirier
Beechcraft A36 Bonanza
Two years ago, I had four CiES senders and Aerospace Logic display installed in my Bonanza and I love them. Very accurate and easy to read. Reliable and reasonably priced.
John Dalman
Beechcraft F33A Bonanza
One of the BEST investments that I made on my A36TC was CiES fuel senders. Gone are my days off time/burn/fuel because Original Beechcraft gauges are sometimes "ideas of amount of fuel on board" and other times "No idea of fuel on board."
After spending lots of money on overhauling senders and fuel quantity circuit boards, etc. just to have this idea of fuel onboard from unreliable (and not to the 1/10th gallon of fuel on board) I [purchased] the Cies senders and WISH that I had done that very first thing when I bought my [OEM senders] 9 years ago. Now I KNOW EXACTLY what I have on board to a “T” at any given time. The peace of mind that comes with that is priceless.
Are they expensive? Yes. Did I hate to spend that money after [investing in] others over the previous few years? Absolutely. Do I regret it? Not at all. Quite the contrary. As soon as I got my plane home from the seller, I should have immediately pulled the old senders and threw them in the trash. Dip your tanks, vary quantity with eyeballs, have a good watch and do your fuel calculations until you save enough money for the CiES senders and you won’t be like me, having spent way more on fuel gauges than you had too. I bet you will eventually end up with CiES senders anyway.
Jamason Byrd
Beechcraft A36TC Bonanza
I install CiES every opportunity I get. Great quality and accuracy paired with Aerospace Logic or JPI.
Kurt Stevens
Beechcraft B33 Debonair
Zero regrets. Get ready for a new level of fuel assurance.
John Hisghman
Beechcraft K35 Bonanza
I put in the JPI 930 and went ahead and bit the bullet on the CiES senders. When you a looking at spending a fair bit on money on the panel, it's really not that expensive. It's very reassuring to have the totalizer and the gauge agree within a couple of gallons.
You can get yourself in trouble with total reliance on the totalizer. It's a garbage in, garbage out device and you can get it out of sync with reality. I have personal experience with this, which is probably why I didn't balk at the price.
My old gauges were terrible. The JPI with the CiES senders always agrees with the totalizer within a couple of gallons. And it's within a gallon when the total fuel in the mains gets below around 30 gallons.
Is it an absolutely must have? No. But the new technology is clearly better and it's certainly an upgrade that I'm happy is available for my old plane.
Verified Purchase
Beechcraft F33A Bonanza
CiES senders are an excellent product. Once you try them, the only thing you will question is how you managed to deal with wandering fuel gauges all those years.
Rodrigo Santos
Beechcraft C33A Debonair
I've flown 30 hours with the new units and they're awesome. I am much more confident stretching my flights to five hours knowing the fuel on board accurately and partial fueling is much more precise.
Installation, in the end, was not overly problematic. It did take the guys a long time to figure out where and how to run the wires. Charged labor was 76 hours. No hiccups once calibrated, but that process also was poorly outlined. Overall installation was not straightforward, but I suspect it will be with practice.
Verified Purchase
Beechcraft B58 Bonanza
Learn More
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A Comprehensive Overview
What is a Fuel Sender?
Fuel senders are components of your aircraft's fuel system responsible for measuring the level of fuel in the fuel tanks and sending that information to the fuel gauge. The fuel senders are located inside the aircraft's fuel tanks and consists of a nitrile rubber (NBR) float, a hard-anodized aluminum rotor and housing, nickel-plated Neodymium magnets, complex electronic equipment (outside the fuel tank) and other quality components.

Top Five Sender Problems Solved with Advanced Tech
A fuel sender is a component of an aircraft fuel system that measures the amount of fuel in the fuel tanks and sends that information back to the fuel gauge. When a fuel sender goes bad or fails, the fuel gauge may not accurately display the fuel level. This can be frustrating and potentially dangerous.
WE’RE COMMITTED TO HIGH QUALITY, SO THE
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.