Gas cap breather installation

ccpomea

Member
Local time
11:20 AM
Joined
Oct 8, 2010
Messages
39
Location
Massachusetts, USA
My engine kept cutting out, realised that my gas cap was air tight which was blocking fuel flow.

Found brief reference in an old post on the forum about installing a breather from a dirtbike so I ordered one from eBay. Thought some picture's might help people out. I have a small lathe which makes it easier but this could be done with basic hand tools.

Drilled center of gas cap - pilot hole first.

01 pilot.JPG

This is the hose coupler I bought from local hardware store, I just picked one I thought would work best.

03 coupler.JPG

Then drilled out the gas tank hole to just a bit smaller than the diameter of the coupler.

02 drill.JPG

And shortened the coupler, also turning it down to match the hole in gas cap.

04 chucked.JPG

05 turned.JPG

Roughed up both surfaces with a bit of sandpaper and epoxied them together.

06 epoxied.JPG

And after a few hour's attached the eBay breather (I ended up removing the tip of the coupler because it was a bit longer than neccessary).

07 installed.JPG
 
wow, seems like an AWEFUL lot of work just to vent the gas cap.
one of my gas caps isn't even a gas cap at all. It's a chrome push in oil fill cap for a car valve cover($4.99).
I vented it by just drilling a small hole in the center of the cap, and the I epoxied this little $1.49 pewter charm over the hole. The back side of the skull is all open and the eyes are open, so the cap is vented, but you can't see the hole in it.
It took me literally 5 minutes to make it, it looks cool, and is functional.
yeah I know you're thinking "what about water or rain entering the hole and getting into the gas?"
#1, i don't ride my bikes in the rain. #2, I don't wash my bikes with a hose.

cap1.jpg
 
Last edited:
Cool. i'm interestged in venting my cap that way. I hate the way fuel seeps out onto the tank when it is close to full.
 
I had the opposite problem, my tank was airtight - engine would cut out from lack of fuel.

You might be fine just replacing the o-ring.
 
Back
Top