As Bob H. points out, fuel vapor recovery has no effect on the engine
emissions. There are several emission systems on cars.
1) Fuel Vapor recovery.
2) Exhaust.
3) Other fluid or vaport loss
The only system which affects the engine performance on the MGB is the
Exhaust emissions.
So there's no reason not to have a fully functional carbon canister and
vapor recovery system, and really no reason not to use a PVC system.
I have a 81 Datsun pickup with air injection in the manifold and no air
pump. Just like tuned headers are used to scavange the engine, it uses
a tuned exhaust manifold to pull fresh air from the air cleaner. The
main components are an exhaust manifold designed to use exhaust pulses
to pull air in from a tube, and a reed valve in the air cleaner to keep
the air going one way. To bad MG didn't think of that instead of the
air pump route.
Blake
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