Direct Fuel Level Indicator C-170 / C-172

Part# 12-21210


Direct Fuel Level Indicator, quality made of acrylic PVC tube with a paper scale. Calibrated to individual tanks, allow an accurate check of on board fuel level indicators and eliminate the guess work.
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WARNING: The product may contain and/or expose you to a chemical(s) or substance(s) which are known to the State of California to cause cancer and/or birth defects or other reproductive harm.

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Timothy H Verified Purchase


October 26, 2022

I was using a 19.5 fuel gauge on my 172N with 20 gal tanks checked with the new gauge and there was a 3 (6)gallon difference. As with everybody I was taught not to trust the aircrafts fuel gauges so a 6 gallon difference is important.

Randy L
September 24, 2020

Works but I prefer the one with it printed on the outside of the tube and not a strip inside the tube.

James S Verified Purchase


August 10, 2022

The INSERT inside the PLASTIC tube moves, therefore, could be inaccurate. I will certainly pay more attention if I were to purchase a fuel level indicator again.

Ted C
October 6, 2020

The indicator gauge has a white indicator strip, mounted internally. While the strip seems to aid in viewing the fuel level, it appears to make it difficult for the fuel to flow upward in the gauge. Fortunately, when I first tested it, the fuel tanks were full. So, I knew that I was getting a false reading. The previous gauge did not have that strip and did not have any problems with indicating fuel level.

May 19, 2020


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: Do you have one of these that is calibrated for a C172SP?

No, none are specially calibrated for an exact model but are made to fit a range of a specific aircraft models like the Cessna 170 & 172.

Q: What size tank is this fuel level indicator made for?

This fuel level indicator is for 20 gallons total.

Q: Is there a fuel stop that fits this smaller diameter of the tube? This tube is 3/8 and the fuel stop fits 1/2

Unfortunately there is only 1 size of Fuel Stop available at the moment. It will not fit this tube.

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