Why has my carb (Solex 28Pict1) suddenly taken to piddling gas when (but only when) the engine is shut down; and can I fix it?
It drips for about 10 seconds or so like there's some pressure forcing gas out, it is visible at the throttle shaft but hard to say where its originating from. Happens both with a hot engine and if its only been running for a few minutes.
If it were worn throttle shaft bushings, wouldn't it leak all the time? And wouldn't a leak manifest itself as an uneven idle from air being drawn in? My idle is steady and the leak only appears on shutdown.
I have tried replacing the fuel shut-off needle valve which hasn't helped the situation. I've tested the float for leaks and it appears sound. Could I try lowering the float level by adding another gasket underneath the needle valve?
I've also been told that this is normal and that there's nothing I can do about it but I'm having trouble buying that, gas dripping onto a stinking hot manifold cannot be safe.
Some advice would be welcome...