The Cessna 120-140 Association Forum

I have a 1946 model 140, and in discussions on fuel caps, I've never seen this exact style pictured online, I'm curious about the nuances of these caps in relation to other discussions speaking to providing the correct amount of venting to allow for fuel flow.

That is not one of the caps addressed in the discussions. I'd be very cautious given it carries the word "vacuum" stamped on the edge.

Required reading...

https://www.cessna120140.com/Forum2018/ ... f=10&t=103

This with 2 1/8" holed drilled on the top will aproximate the originals...

https://www.aircraftspruce.com/catalog/ ... ey=3019014

This is what you oughta have...

6597 wrote: ↑Sun Nov 30, 2025 6:03 pm Required reading...

file:///home/david/Desktop/gas_cap_array_may__05.pdf

This is a file that was posted in the old forum. I've attached it here.

gbeard76209 wrote: ↑Sat Nov 29, 2025 9:48 pm I have a 1946 model 140, and in discussions on fuel caps, I've never seen this exact style pictured online, I'm curious about the nuances of these caps in relation to other discussions speaking to providing the correct amount of venting to allow for fuel flow.

Photo is a non-vented automotive fuel cap. Ford/Lincoln/Mercury. Search E1AZ-9030-A

So definitely not appropriate.

dcannon wrote: ↑Sun Nov 30, 2025 8:15 pm Photo is a non-vented automotive fuel cap. Ford/Lincoln/Mercury. Search E1AZ-9030-A

So definitely not appropriate.

(Somewhat tongue in cheek...)
Well, if you think the official Cessna caps weren't also used in an automotive (or more likely, farm tractor) application, then you're fooling yourself!

dcannon wrote: ↑Sun Nov 30, 2025 8:15 pm

gbeard76209 wrote: ↑Sat Nov 29, 2025 9:48 pm I have a 1946 model 140, and in discussions on fuel caps, I've never seen this exact style pictured online, I'm curious about the nuances of these caps in relation to other discussions speaking to providing the correct amount of venting to allow for fuel flow.

Photo is a non-vented automotive fuel cap. Ford/Lincoln/Mercury. Search E1AZ-9030-A

So definitely not appropriate.

Might not be appropriate haha, thats crazy to find out, at least they're from Ford am I right? This airplane is new to me, and as far as I can tell by looking at pictures, the fuel caps have been this way since the 80s. It seems that the hole in them was drilled, similar to what other fixes suggest for replacing the incorrect ones, so not entirely non-vented.

6597 wrote: ↑Sun Nov 30, 2025 6:03 pm Required reading...

https://www.cessna120140.com/Forum2018/ ... f=10&t=103

This with 2 1/8" holed drilled on the top will aproximate the originals...

https://www.aircraftspruce.com/catalog/ ... ey=3019014

This is what you oughta have...

gascapcessna140small.jpg

Seems like finding originals for sale is next to impossible, know where I could get a pair? Thanks for the helpful info on making one myself if need be.

https://www.aircraftspruce.com/catalog/ ... lange2.php

Photo doesnt show it but these are drilled with 2 holes

dcannon wrote: ↑Mon Dec 01, 2025 10:04 am https://www.aircraftspruce.com/catalog/ ... lange2.php

Photo doesnt show it but these are drilled with 2 holes

Under the photo:
"Photo may represent series and not specific product"