Venting a non-vented gas tank cap

[CliffordK]

Would you lose the cap if you unscrewed it 1/4 or 1/2 turn when mowing, then screwed it back down when finished?

I just searched E-Bay for "VENTED JOHN DEERE GAS CAP", and a bunch popped up, most with what looks like a hole in the middle.

 

[MTGreen]

Would you lose the cap if you unscrewed it 1/4 or 1/2 turn when mowing, then screwed it back down when finished?

I just searched E-Bay for "VENTED JOHN DEERE GAS CAP", and a bunch popped up, most with what looks like a hole in the middle.

Yes the cap would vibrate off immediately.
This mower doesn't take the standard thread cap, presumably because it's pretty old as mowers go

 

[Fuddyduddy1952]

I like to fabricate things. A one way check valve like this $11.99 one, brass for fuel & would work. Hole in cap, thread on nut so air goes in but won't let fuel out.

 

[slckeys]

I'm not affiliated with the seller, but a quick search found me this on eBay. Looks like a small hole middle underside. Might this work for your application?

Fuel Tank Cap AM117525 AM100289 UC30178 Fits John Deere R70 R72 R92 160 165 170 658370788921| eBay

Find many great new & used options and get the best deals for Fuel Tank Cap AM117525 AM100289 UC30178 Fits John Deere R70 R72 R92 160 165 170 at the best online prices at eBay! Free shipping for many products!

www.ebay.com

 

[MTGreen]

I'm not affiliated with the seller, but a quick search found me this on eBay. Looks like a small hole middle underside. Might this work for your application?

Fuel Tank Cap AM117525 AM100289 UC30178 Fits John Deere R70 R72 R92 160 165 170 658370788921| eBay

Find many great new & used options and get the best deals for Fuel Tank Cap AM117525 AM100289 UC30178 Fits John Deere R70 R72 R92 160 165 170 at the best online prices at eBay! Free shipping for many products!

www.ebay.com

Yes looks like it will work, thanks. Part numbers match. I wasn't looking aftermarket and apparently I should have

 

[Tinhack]

180 degrees from the first hole would create a single straight hole.

I imagine you mean 90 degrees

I hope you're never lost in the woods. My compas has 360 degrees. If North is 0 then 180 is South.

 

[Tinhack]

If you can't get a vented cap, make your own. Cut a round piece of plastic to fit tight to the underside on that seal area. Then put your holes in.

 

[ruffdog]

Most vent holes in caps were smaller than 1/8"....more like 1/16"

 

[Fuddyduddy1952]

Probably I'd just drill a hole, J B Weld a 2" piece of steel tubing in it & stick a couple ft. of rubber vacuum hose on it.