Swift Fuel Capacity Senders

From $21.65 to $324.00
Model Number Size (in.) Description Part Number Price Buy
SF-F-1212Bendable Alarm Sender, 5V Output
SF-F-1818Bendable Alarm Sender, 5V Output
SF-F-2424Bendable Alarm Sender, 5V Output
SF-Z-1212Alarm Sender, 5V Output
SF-Z-2424Alarm Sender, 5V Output
SF-Z-4848Alarm Sender, 5V Output
301-KV-000--Sender, Connecting Cable
Subtotal $0.00
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Note: Photo for general reference only. Actual sender may differ in appearance.

Swift Fuel capacity sender
Similar to Falcon Gauge
Made in China
California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm -

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Got the products, seems completely with manual and mounting HW. Will be installed later, for the time being all good, a clear recommendation!

Peter S Verified Purchase


September 12, 2023

The sender is just as described and easy to set up and use. I had to bend mine and cut it. Calibration was a snap using a tube full of fuel to dip it in for the full setting. You do have to calibrate empty and full in one session, though. You cant do one at one time and then later do the other.

Mark H Verified Purchase


March 23, 2022

A warning. Download the instructions. Within it warns against bends with less than a 1 radius! This was fine for the unit shipped with an Aluminum tube, but UNABLE for the unit shipped with a steel tube. I did not note the difference until too late, and the steel tube broke well before a 1 radius. They are shipped both ways according to ASS Co.

Eric R
November 3, 2017

I too have been waiting for weeks to receive the sender and gauge. Received the sender this week but the gauge is still backordered. I assumed it came with the warning light for the panel, as that was a main issue. As designing circuits is out of my ability, I would appreciate Aircraft Spruce aiding me in this area. Could you at least get me in touch with someone that can provide me with components not supplied with those I ordered. Yall do a great job and Im always satisfied with the items I order, but could use your help on this issue. Thanks, Chris

Chris B
July 10, 2017

I bought 2 of these for my wing tanks. They seem to more or less work, except both top out at about 3.7V output, not 5V. The matching 0-5V gage therefore cant ever indicate more than 3/4 tank. Installed in a standard 12V system.

Ed Z
October 12, 2020

After waiting 2 months for the backordered model with the low fuel warning light option to be shipped, it arrived with no installation instructions or other paperwork. According to the documents which should have been included (which I had to download) there should also have been an LED light included for connection to the low level warning circuit but there was nothing in the packaging but the fuel probe. I will now have to try to find an appropriate LED and design the circuit (appropriate sized resistor) in order to take advantage of the warning light feature. Im not impressed with the overall purchase of this item but after waiting 2 months for the order to ship Ill install as is and move on.

Scott H
April 3, 2017


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: For the Falcon FP-012-5 fuel sender, how much does it protrude above the surface of the fuel tank when installed?

It is about 1 inch but you can now refer to the Documents Tabs on this web page for more specifications.

Q: Will the Falcon Senders give you the same reading if you use both 100LL & auto fuel from time to time?

Per the manufacturer, this will work as long as you are just using 100LL and automotive fuel.

Q: I have a new Falcon FP-24-5 Sending unit. My question is can it be cut down? My tank is 20" tall.

Yes, part number 10-03421 can be cut back up to 12".

Q: Can the FP-012-5 12 be shorten to 9"?

Yes, The FP-012-5 (10-03419) can be cut back up to 6 inches.

Q: Is it possible to use this sender with a 24 volts aircraft?

Yes, you must cut the jump wire when using a 24V system.

Q: Can these Falcon senders be mounted to the bottom of a fuel tank?

Yes, please refer to the installation instructions for more information.

Q: Can the FP-012-5W 12 inch also be shortened to about 10 inches?

Yes, the probe can be shortened no more than 6". The probe will need to be re-calibrated if cut. The unit comes with installation and calibration instructions.

Q: Can you verify that this comes with the mounting hardware shown?

Yes, these senders ship with the required hardware.

Q: Can these probe senders be used with jet fuel?

We have no data showing these can be used in jet fuel applications. It may work but we cannot say for sure.

Q: If installed on bottom of tank, how does it know the difference between full and empty?

The probe must be calibrated before installation in order to have proper reading of the tank.

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