HI Ghost, the three AN- male fittings on your tank are outlet, return, vent. If you poke a screwdriver down the center of each fitting one of them should have a Ball bearing (check valve/roll over valve ) if not you can buy one that mounts to your trunk floor bulk head style , or one with a AN- Female to male end that will mate up with the existing tank fitting and then vent outside the trunk.
1,connects to tank fitting
View attachment 673330
2, bulkhead style to existing fitting in tank.
View attachment 673331
AN- hose fittings are easy to connect to steel braided line
(summit racing)
View attachment 673335