Re: Re: Where exactly does the petrol go?

I am surprised to learn that anti-gravity petrol has not yet reached the colonies!

So what else is there? My first thought was possible syphonic draining of the carb fuel bowl – but I now realise that is not possible on two counts –
1) the fuel enters at the top of the bowl so, as soon as any is removed, the level drops creating an air gap between the remaining fuel and the inlet valve so the vacuum permitting the syphon will be lost, and
2) If the float valve is sticking in the closed position fuel cannot pass either way so the missing fuel cannot have left the carb via the inlet valve.

I don’t have the sticking float problem but, despite an in-line non-return valve and careful tightening of all pipe joints, I too suffer from having to prime the carb after much more than 24 hours standing. I can only think it has to be a combination of syphonic draining of the pipes and fuel pump plus evaporation from the carb – remember the volume of the bowl with the float in place is very small and, if the engine is hot when it is switched off, evaporation is almost certainly going to be enhanced.

Noah