I've got my fuel cell mounted in the well of my '90, Im running a firewall too to keep it track legal and all. Next step is to run a roll over valve. I was looking at this one on summit, P/N SUM-220020 , Now If I ran that wouldnt I still need to plumb it so its outside of the car? Whats the best way to do this and what have you guys done? I dont like drilling holes in my car Thanks

 

Yes it has to go outside the car.

All the rollover valve is, is a special fitting with a ball bearing inside it. When the valve is upside down, the ball bearing covers the hole to prevent fuel from coming out. It doesn't need to be below the bottom of the tank but can't be inside the car because it's the fuel tank vent. The downside to the rollover valve is that it will only shut off the fuel when completely upside down. If you're on your side, it will still leak.

There are simpler ways to do it. Put a -6 fitting in the front top of the tank or a 3/8" male brake line fitting. Install a hose on the -6 fitting or a 3/8 brake line on the BL fitting and make a loop in the line. The line still has to go outside the car and below the bottom of the tank.

The loop acts like a water trap you find under your sink. No fluid can flow around the loop if the car is upside down. If there's any fluid in the loop when rightside up from driving around etc and there's a suction inside the tank, the fuel will get sucked back into the tank.

 

Alright, thanks for clearing that up.