There are tank designs with 1, 2 and 3 steel lines out the back of the tank... as you can see your design. Lines:
1. Vapor capture/overfill line enters the separator. The liquid is past thru the separator side for liquid.
2. Neutralizer line. This enters the separator as well. It filters the vapor to atmosphere and/or to a cylinder to fire off that vapor. There is a 14.7 psi that has to remain above the liquid [in the tank] so there is no vacuum occurring; where the tank can implode from the pressure change. So here is the air line more or less, while the first one is a liquid line.
3. The recess in the tank's gas cap mount needs a weather hole line. Look at the 3 mounting table stands under the gas cap. Follow the allen bolts. 2 bolts are fake so as to enhance the beauty ring or keep it more uniform. Those are your 3 triangle points for removal. Those legs are the reason for the sunken filler hole.... the flush mounting idea. Look for the weather/wash hole in the recess. Make sense it rains and if you pop the cap there goes the water in the tank?
The Gas Cap Design:
Where the two phillips screws are in the cap.
Where the ends of the holding plate have opposite protrusions in that rectangle block.
Those are for the springs and plate placements.
The nipple holds the closed plate side and closes the [air] nipple hole path to the flat washer or plate.
The tank side holds the plate or the ceiling washer, meaning, both look the same but are positioned oppositely.
The gas is sucked out of the tank via fuel pump.
The vacuum occurs. A soft spring holding the plate closed is now collapsing.
The vacuum lifts the nipple's side of plate open.
The ceiling plate has gas sloshing over the plate and collapses the spring letting gas in that cap's air gateway.
The gas is sitting there in the cap. The neutral pressure is about to change to vacuum pressure.
The nipple plate opens by vacuum. The gas in the cap runs out of that hole. For every action, that cap is clean of gas this slosh around, until the next vacuum pull round and keeps emptying the backwash of the high fill. Yes, they thought of the oops, I topped it off too much.
Make sense the cap is a pressure regulator in the static sense of its working movements?
* Last updated by: Hub on 8/22/2018 @ 12:20 PM *
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