I understand the value of evaporative emissions recovery as well as PCV
systems, especially regarding their negligible effect on operation. But my
issue is that I'm missing the plumbing under the hood, and independently, I
think the top of the fuel tank is perforated. I have another tank that I
believe to be sound, and it is non-vented (from an older B, circa 1965 or
66 or so).
Less related, my 1994 Dodge Ram 1500 PU has no air pump; I wonder if it
depends on a system similar to your truck?
Bullwinkle wrote:
> 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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