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The only thing you'll see of the rollover vent valve is a brass fitting on top of the tank. The "guts" of the valve are inside the tank. Here's a link to Tanks, Inc and their valve - In Tank...

I would expect your tank to have an anti-rollover vent valve, with the tube running up to a high point. You should be able to see it from the front, getting your head up by the differential and...

A friend of mine had braided SS line from tank to engine, with an OEM style in-tank electric fuel pump. Replaced the pump, but chasing the problem like yours he found that the old SS line (25 to 30...