Paul :
I believe you'll find that there is a vent in the bottom of the carbon
cannister (the end away from the hose connections). It _should_ be
impossible for the cannister to communicate vacuum to the bowl and tank
vent lines, but it's possible the cannister vent is blocked somehow.
The test is easy, just pull the tank and bowl vent lines off the
cannister, make sure they can't tangle with anything, and try driving
the car. You should not be able to detect any difference. If it makes
a difference, you may have a defective cannister. (I once succeeded in
filling one with mud, but not on a LBC.)
According to my Spitfire Haynes, the filter in the bottom of the
cannister should be changed every 15K miles.
Randall
Ptegler wrote:
>
> What are your thoughts on something in this breather
> system fighting each other? That is to say... the float
> bowls being effected by vacuum from the valve cover
> or fuel tank vent.
>
> If the fuel tank vacuum created as gas is extracted, or the
> crank vacuum pulling on the canister were to create
> a small vacuum in the float bowls, does it sound feasible
> that this would effect the gas level in the float bowls
> which would explain why pulling the choke to compensate
> for the level in the jets makes it run better.
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