Cessna 120-140 Association

Hi, somewhere in one of the news letters there was an article on how to calibrate a fuel dip stick with measurements. Does anyone recall that?

There probably was, but, if you can't find it, don't let that stop you. It's pretty easy.

1) drain tank.
2 put in a known quantity of fuel.
3) mark stick
4) repeat from step 2 as necessary.

I have a copy of the measurements, I think I found them on the forum before it was updated. Not my work but i copied and pasted it below:

I calibrated a fuel dipstick using an ordinary wooden 12" ruler. Here are the numbers. This was done on a level hangar floor. Scott 3200 tail wheel, 6.00x6 tires. Best to empty your tank and start out by putting in exactly 4 gallons. Stick the tank, mark the stick. Then add a gallon and stick the tank, mark the stick, etc. etc. Note the reading on your fuel gauge as you go if you want to, but remember it will not read the same in the air.

6" = 12+ gallons
4 1/2" = 11
3 5/8" = 10
3 1/8" = 9
2 1/2" = 8
2 1/8" = 7
1 3/4" = 6
1 1/4" = 5
7/8" = 4

Thank you for your replies.

The above measurements are very accurate. I used a paint paddle with these markings on my '48 140 and it's usually within half gallon when I refuel

Steve Rose

Will these measurements hold true for the “A” models as well?