A word of warning

I'd taken my bay tank vent to the PCV on the Scooby.
Previously I'd had a hole in my filler neck elbow (unbeknown to me) so everything was going well ie no problems

I changed the elbow when I discovered the hole.
Anyway rock on about 2-3 weeks...
Disaster. Tank wasn't breathing any longer
Petrol leaked out via the filler neck and the fuel sender!






I snapped on of my fittings removing the tank.

How are you guys venting your tanks? My filler cap is a non-venting one, I'm toying with drilling it.

IS THAT SUCKED IN!!!?!?!?!??!!!

if so... than thats insane!

cant remember, you running the charcoal canister balders?

Ouch................funny that. I did a post here a while ago not being able to work out why my steering got tight. Mine was the opposite effect to your suck, mine expanded that much it squeezed the steering column making it near impossible to drive. I like to think I have a long range fuel tank now!

Im running a compulsary charcoal canister but the supposed fuel rated t-piece choked up and stopped any breathing. Changed it to a brass job and now no worries.

Just done some very rough maths

Assume 3 sq feet for the top surface
Assuming 3 PSI pressure difference between the atmoshpere and tank....
1,600 lb of force on the top surface, 10 times my weight!

I didn't have the charcoal canister.
Wasn't a problem with my undiscovered split hose.

Live and learn. I hope this saves others time & expense. Possibly saves their vans from catching light like mine could have - my tank leaked via the fuel gauge sender & filler neck. I had petrol dripping inches away from the hot exhaust.

Wondering about just venting the tank to atmosphere or plumbing in the can and doing it properly. (rolleseyes, I'll be doing it properly then)

ElusiveStranger wrote:Just done some very rough maths

Wondering about just venting the tank to atmosphere or plumbing in the can and doing it properly. (rolleseyes, I'll be doing it properly then)

Yep, air pressure can be pretty strong!

My '71 had the vents plumbed up into a sort of a can in the intake tower (up by the vent) and then down through the battery trays. Seemed like a good way to prevent liquid gasoline from getting loose. Not exactly emission-friendly, though.