Pressurized gas tank leaking out filler tube

[RicardoA]

Recently purchased in 1967 Plymouth satellite with a new gas tank installed. If it sits in the sun at all with only a half a tank, it leaks gasoline around the filler tube and the cap is pressurized. when I remove it at spills out gas. Do I need a vented cap or was the gas tank Supposed to be vented? Thanks for your help.

 

[70 sublime]

My 70 Charger used to do the same thing
If it had half a tank of gas and was parked on the slope part of my driveway the back end of the car was higher than the front (70 charger the filler pipe is at front of tank )
It would start leaking gas out the breather vent tube into the rear frame rail when the sun came out and warmed up the volume of air in the tank
The way the car was sitting the filler neck would be under fuel and the air in the tank would get bigger and push the gas up the pipe
Nothing can be done about it other than keep the tank fuller or with less fuel so the air can can get out

 

[RicardoA]

My 70 Charger used to do the same thing
If it had half a tank of gas and was parked on the slope part of my driveway the back end of the car was higher than the front (70 charger the filler pipe is at front of tank )
It would start leaking gas out the breather vent tube into the rear frame rail when the sun came out and warmed up the volume of air in the tank
The way the car was sitting the filler neck would be under fuel and the air in the tank would get bigger and push the gas up the pipe
Nothing can be done about it other than keep the tank fuller or with less fuel so the air can can get out

That’s very helpful. I think you’re right. I only noticed it happening when it was parked on my sloped driveway. I’ll just park it on a flat surface in the cul-de-sac.

 

[toolmanmike]

That’s very helpful. I think you’re right. I only noticed it happening when it was parked on my sloped driveway. I’ll just park it on a flat surface in the cul-de-sac.

It should be vented. Look for a small tube (brake line size) near the fill tube in the trunk.

 

[RicardoA]

It should be vented. Look for a small tube (brake line size) near the fill tube in the trunk.

Thanks, I will look for that. And make sure it’s there and functioning.

 

[R/T Boy 67]

This

 

[RicardoA]

This

View attachment 1857576

Thanks