Reply to "Fuel Tank Cap (lockable)"

joules"Racing is Life, anything before or after is just waiting" - Steve McQueen

Doug has been sniffing way too many fumes after he removed his canister....

The charcoal canister should be connected to the air filter NOT to the intake manifold (and a source of vacuum). You don't want the engine to be pulling vapor from your fuel tank for a number of reasons; it can impact air/fuel ratio, if your tank isn't venting through the cap you can collapse it (this has been done!) and what if a backfire occurred?

The canister's purpose was to capture fugitive emissions as the fuel sloshes around/tank filled etc., but when you think about it the charcoal will load up and then it's pretty useless, especially after 30-40 years!

Most people have done away with the canister and installed an anti rollover valve in the line that allows venting but stops the tank contents emptying should a rollover occur. Here's Hall's solution that replaces the outlet on the tank and can be piped to the air filter still.

http://hallpantera.com/cgi-bin...ntera-inc&item=22057

Julian

7/9/157:38 AM

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