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"Joe Hovel" wrote in message
news:zVZD5.13$Dc4.1537@vic.nntp.telstra.net...
> Norman,
> can you explain the safety wiring of fuel fittings for me I must have
missed
> it.... I have a similar "bubble" problem which is intermittent - and I
cant
> find the air leak....
> Joe

____________________________________________
Hia Joe
I hope this information helps you and others

1/ Where do the bubbles come from in a fizzy drink like champagne ?

Answer
They are put in during manufacture and are normally not seen until the
pressure is released, and when its warm the bottle erupts like in not cold
enough champagne

____________________________________________________________


2/ Why is it that bubbles just appear from nowhere even when you can see
through the pipe?

Answer
As above 1 the gases are already there and what makes it worse we usually
find that the fuel is a/Hot and b/ that the fuel is being sucked by a
fuel pump to the carbs and that the gases then escape whilst subjected to
negative pressure ( Vapour Lock its usually called, and cavitation in
pumps ) by the pump.Because the feed pipe to the carbs is short the gases
get passed straight into them. The way around these problems is to keep the
fuel cool until needed ( not always possible if you keep full tanks in a
hot hangar ) and to fit an electric pump as backup that is below the tank
and pressurises the fuel to the carbs which also shows up leaks to the Vac
pump anyway. When its hot I can see the bubbles just appearing two feet
below the Mikuni pump, just switch on the electric and they stop.

Yours Helpfully
Microlight Mick

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