Why does a Cessna 150 have one tanks vented in the cap, one vented below with a tube?

Question

Why not both the same?

Thanks.

Answer 1

I don't remember the caps being vented...I thought the tanks were interconnected and the left side has the tank vent so the use of gas does not cause the wing to implode.

This is just off the top of my head.

Answer 2

If memory is correct, the caps are vented, but the tube hanging below the wing is not for fuel tanks.

The tube might have a little 'flipper' on the end of it. It should be instrument related.

Answer 3

Cessna Grand caravan you mean because im a pilot and i don't think those exist and the Cessna has tanks for fuel and transportation any way.

Answer 4

There is only one vent on that Cessna (and a few other type Cessnas) and it is that small tube hanging behind the wing strut.  The tanks are interconnected for venting.

While parked on a slope (one wing higher than the other) fuel can run from one tank to the other through that vent.  That slope can be important if you are filling the tanks or if the tanks are nearly full.  Fuel can run from the ‘high’ tank into the lower tank and then run out the vent.  This cannot occur in flight unless you are in an extended slip or skid.