2 fuel senders per tank?

[Pinecone]

On 12/11/2024 at 7:11 AM, LANCECASPER said:

The M20M POH says, "The optional visual fuel quantity indicators on top of each wing tank should be used as a reference for partial refueling only. These gauges will not indicate the tank's total capacity above 30 gallons of fuel."

So the visual gauges on the wings measure the last 30 gallons in that tank. Any amount over 30 gallons is still going to show up as 30 gallons. Once you see the gauge go below 30, that's what you have in that tank.

The Monroy tanks change that, as there is fuel in the Monroy segment before you reach 30 gallons.  So at some point, the wing gauge will read less than the actual fuel, even though it is showing less than 30.

I calibrated some dipsticks and the wing gauges.  When my wing gauges read 30, I actually have 37.5 usable.   At 30 gallons usable, the wing gauge reads 24.

But the sight gauges are always a bit off.  At 17 on the gauge, I have 20 usable.   The good thing is, I always have more than the wing gauges say.