Quote:
Originally Posted by Asshat
Why do you need a vent tube in the new style filler necks while the original one on the C10 does not?
|
The in cab tank for 60-66 doesn't have a vent in the filler neck, but on the Suburban and Panel tank that's under the rear floor, it did have a vent tube that runs from the tank into the top of the filler neck.
A vent is good because it allows the fuel to expand and contract with the temperature without building too much pressure inside the tank. It'll probably help with ease of filling since the air being displaced by the fuel can go through the vent instead of out the filler neck that the fuel is trying to go down.
There's probably some other science-y reason I don't know about
__________________
Christian Carpenter
1963 C10 -
Frankentruck 283, Muncie 3 speed with overdrive
Overdrive wiring here
1963-ish truck bed trailer -
Half-Wit
1981 C10 -
Penny 305, th350 --> Soon to be 350, Saginaw 4 speed
1995 Dodge Dakota Sport
"I'll put it simple: if you're going hard enough left, you'll find yourself turning right." - Doc Hudson