Fuel Feed failure for a single engine Cessna

[GyvAir]

A cross vent tube might be a more accurate term if we're talking typical 172.
As others have already mentioned, it would be pretty unlikely for a venting issue to completely stop flow from one tank.



Colonel beat me to it..

[ahramin]

I'm fairly certain that if the fuel selector has a both selection, the tanks have to have a cross vent tube.

[digits_]

Big Pistons, I don't really know why you are asking it, but an instructor of mine once had an issue in - I believe - a C172. He was low on fuel (but still legal), one tank was empty , which caused a vapour lock like effect and caused his engine to die. He glided on a highway, put extra fuel in it, let the engine cool down for half an hour and took off again.

Send me a PM if you want more details.

[iflyforpie]

Cessna 182 does not have a crossover tube. You can select 'both' on it. Tanks have individual vents.

For the Cub I am building, you can select both wing tanks at the same time, and they will be vented through the caps alone.

[photofly]

Cessna 182 does not have a crossover tube.

Yes it does.

[iflyforpie]

I guess you do have a place here with your constant disagreements, photofly.

185, then...... .....though I suppose that some pressure equalization may be possible even though a good portion of the EDP fuel flow is being pumped back into the tanks via the return lines at cruise.

[DougRonan]

As far as I know all single engine Cessna that have a "both" setting have a vent tube connecting the tanks along the front carry through - including the 185??

[GyvAir]

Not looking to pile on, IFFP, but I think the cross vent is pretty much universal in the high wing Cessnas.

[ahramin]

Alright, I went and dug it out

CAR Standard 523.975 (4)

Airspaces of tanks with inter-connected outlets must be inter-connected;

[iflyforpie]

Alright, I went and dug it out

CAR Standard 523.975 (4)

Airspaces of tanks with inter-connected outlets must be inter-connected;

I just found it too.

Ill placard the Cub fuel system one tank on at a time.

I just never really thought of return lines pushing back about the same amount of fuel as the engine is consuming back into the tanks as 'vents'.

[DougRonan]

Alright, I went and dug it out

CAR Standard 523.975 (4)

Airspaces of tanks with inter-connected outlets must be inter-connected;

I just found it too.

Ill placard the Cub fuel system one tank on at a time.

I just never really thought of return lines pushing back about the same amount of fuel as the engine is consuming back into the tanks as 'vents'.

You should look seriously at setting your cub up with a fuel system with a "both" - the reason for "both" is to give you fuel in any attitude and if you have a problem with feeding from on side is automticlay feeding form the other side - you should set it up with two outlets as well - front and rear - with a "both" fuel selector, front and rear outlets, and a vent line joining the two - you will have fuel in any attitude!! What kind of Cub are you building??

[iflyforpie]

I think I'm going to call it a Super Special, since it is about half way between a Super Cub and a PA-11 (Cub Special). PA-18 fuse, Wag Aero (J3) wings, and an O-235. I got it from Cat Driver.

I'm limited with the wing tanks as to what I can do with them. Three fittings.... one for fuel pickup, and two for the top and bottom of the sight glasses.

Not to worried about unusual attitudes, since there is a ~5 gallon header tank like the Super Cub has under the dash.

[Cat Driver]

When he gets it finished it will be better than a PA11, which was the best Cub.

Then he can do airplane handling skills training with it....

......which was the reason I had in mind for it.