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Problems replacing the fuel pump on my merc 470

Here is my problem I am unable

Here is my problem I am unable to break free the nuts on fuel line at the carb it seems to be stuck I have bought a tubing wrench and it seems to not wanna break free. I was thinking about cutting the line and replacing it with rubber marine rubber tubing.

Is it right tight and left lose on tubing?
Any idead would really help.
 
"Use a penetrating oil on the

"Use a penetrating oil on the joint and the tubing, wait a while and then use the tubing wrenches in a manner that allows you to squeeze them together like a pliers. NO HEAT ON FUEL LINES! They will break lose."
 
no rubber lines there either.

no rubber lines there either. use two wrenches on the carb. hold the big one and turn the small one.
 
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