C172F fuel caps

C172F fuel caps

I need some advice regarding fuel caps for my 1965 Cessna 172F with regular stock 19 gal twin wing tanks. I know that there is a crossover vent tube in the fuel system and I believe Cessna vented only one of the caps.  However I have heard that for non-acrobatic flying it is better to vent both tanks so as not having to rely on the crossover vent tube. But I have also heard that the vents allow moisture into the fuel system in a plane that is known to hold moisture in the fuel tank baffles.  So my question is; would you install both vented caps or one?  And where can you buy these caps as mine are old and nasty.  I've checked Aircraft Spruce, Chief and others and can find no caps listed for this plane.  They are standard type bayonet caps with chains.

A big thanks to all who have replied to this "newbie's" questions.  My son and I have worked all winter restoring this plane and couldn't have done it without the expert advice we got at this site.  We just sent in out dues and are looking forward to learning more.

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Re: C172F fuel caps

The caps ARE NOT vented normally.

Look closely & you will see the rubber "umbrella" that opens under "Negative Pressure?".

Per FAR 23; aircraft with a "Both" Fuel Selector position require
a common venting system.

Venting each tank would defeat that.

I dimly recall that 150's, 152's & SOME 172's require a "Ventable Cap"
on the RIGHT side only.

180's,182's & 200 series require 2 caps of that type.

Determination is due to fuel flow.

For fuel to go OUT air must come IN.


Moisture could enter through the Vent Tube .

You DEFINITELY DO NOT want to block that!

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Re: C172F fuel caps

There is an AD note that pertains to this, AD79-10-14R1. Your aircraft falls under the Serial Number range that requires at lease one vented cap. I have seen quite a few aircraft with two vented caps, which is recommended by Service Bulletin SE77-6 which is incorporated in the aforementioned AD. The only supplier of the fuel caps in question is Cessna...

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