Unless the nut fitting itself where it threads into the carb is where it is leaking,you don't have to remove that--just hold it still with the right size wrench,and unscrew the steel line nut that threads into it..the line will have a 1/2" or 5/8" hex on it depending on what size tubing it takes (5/16" takes a 1/2" wrench,a 3/8 tube takes a 5/8")..
If its leaking at the flare at the end that screws into the carb fitting,it has to be replaced or re-flared,rubber hose will only work if the tubing has failed anywhere along its run from the fuel pump to the carb,and if that is the case you could just cut the line and splice it with rubber fuel hose & clamps..
Any good shop should be able to bend up a new steel line for you and put it on in like 10 minutes...a plumber could do it too,they deal with flare fittings and lines on a daily basis..
I've been in your situation,it sucks--more than once my truck failed to start or had other problems and I was unable to plow my 100 x 30 foot driveway while the storm was ongoing,had to wait till it ended,and then I had snow drifts higher than the hood on the truck!..
I had a few storms I didn't dare try pushing deep drifts up a slight grade from where the truck was parked,I knew so much snow would pile up in front of the plow it would never be able to push it all the way where I needed to put it--then I'd be screwed,with the truck "trapped" there..
Instead I pushed enough snow off to the side so I had some room to make a running start,and raised the blade all the way up,then made a beeline for the street,and prayed no cars were coming,if I slowed or stopped it would have got high centered on the snow the DPW trucks piled along the end up the driveway..once I made it to the street,I was able to make multiple passes and push the snow off the sides onto my lawn,about 20 feet at a time..it was just too wet and deep to make one continuous pass like I usually do..
Your truck will drive thru 2 feet of snow fairly easy with the blade raised unless you have a driveway that tilts to one side,in that case it might slide sideways if you dont get enough ground speed..
i do not reccomend driving your truck with gas leaking--if its just a slight drip,you may get away with running it from a cold start for a few minutes ,before the engine gets hot enough to ignite the gas,but one stray spark from a plug wire could light it off instantly too..