Deadeye

Looking for best practice to vent the fuel tank on a track only 2004 GT3 after removing charcoal canister. I'm thinking a high loop with a roll over valve.

Matt Romanowski

Yup. The discriminator valves work well. Lots of cars don't use them in. That's why you see cars dumping gas at the beginning of longer races - it's all coming out the vent. You don't always have to use the valve (it's a good idea) since the vent when brought back to the bottom of the car is above the tank when turtled. Sideways is different though.

Viperbob1

Have used the ATL TF475 a few times with great luck right into the top of the pump basket. Run a hose then down under car. Works when filling to shut down and not spilling.

Fumes

Matt Romanowski

Is that a silicone hose? If so, they generally aren't rated for fuel use.