Best way to change the cross over line is to tie a light but strong cord to one disconnected end, and pull the cord through as you remove the hose. Tie the cord to the new hose, and pull it back through with the cord.
The rubber fuel line is a push on over a barbed fitting, which is more than capable of holding the pressure. The lines are single use and have to be cut off and trimmed down to reattach.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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