48BigTrucks makes the statement: "They just leaked out fuel when the filler is pointed down in a roll over, just like any style of fuel tank would". This statement is incorrect.

A properly designed fuel tank system incorporates a non-vented filler cap and a roll over vent valve. By design this set-up will not leak, regardless of the orientation of the tank in an accident. The roll over valve has a ball check in it that seals if fluid backs up into the tube. Thus fumes vent out, but not liquid.

Here is a link to an article about a rear pick-up tank install where they show the use of a roll over valve:
http://www.customclassictrucks.com/...k_rear_mount_gas_tank_install/index.html

And here is a link to Tanks. For a custom installation, or retrofit, they have all the parts to install the tank and vent it correctly: http://www.tanksinc.com/index.cfm/p...ory_id=62/home_id=62/mode=prod/prd98.htm

Thanks

Last edited by Hot Rod John; 05/26/2009 12:53 PM.
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