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To prevent gasoline leaks.
1. Good idea to shut off fuel.
2. disconnect line at carb.
2a. Remove bottom of carb and drain gasoline from the bowl and blow out jets so that gas does not stay in the jets and then turn to goo like today's gas has a habit of doing.
3. loosen line at sediment bowl.
4. now rotate fuel line upwards so carb end is ABOVE fuel level in tank ...
that way no gravity flow.
5. Tighten line at sediment bowl.
This way if fuel shut off valve leaks ... no fuel on floor to start a fire.
OR
if someone gets in car while in storage and opens the fuel shutoff valve, there will be no leaks if float valve in carb fails to hold!
6.Also from 60 years of experience it is not a good idea to start car every month like some will say ... UNLESS you are going to drive it for a 1/2 hour or more and get it thoroughly warmed up each time.
If not warmed up water vapor collects in engine and most importantly in the muffler and rusts various parts.