Tank leaks slightly and smells like sprite

good day, I ask about one known and have two questions. please not something like totally negligent and this and that it are only questions. the following: colleague has bought for the transition a mazda 626 build year 2000 2 liter. he wants to drive the only maximum to Januar/februar because he then has his actual car ready for tv he needs until then only one transition car. now it is that somehow there is something leaking there at the tank, I guess the isz of the hose. if the car is fully fuelled is, then 2-3 liters run down again and then is ok otherwise is nothing at the run-out only that the car on the side smells of sprite due to the leakiness. the question is, can it be that there is something leaking or loose on the tank hose? the car was previously driven by an older man who is now also slightly demented and can no longer drive a car, so it may be that there was pulled out of the tap when refueling like a truck someone knows this problem? of the further i yesterday at the winter tire change that a wheel bolt is broken off, which was so firm that must have already suffered something before and then it was off. at the moment he has thus only 4 wheel bolts. to what extent is this rideable? IS NATURLY NO big thing and one could fix it would have to look. just as said since the car should be used anyway only a few weeks or a month scarcely, is of course then logical conclusion that one does not want to put too much more in denwagen an money, that pays d I’m sure he will get rid of the dare anyway and then most of them want to nimble. especially since he has rusty on the bike runs, although only there and otherwise only 140 thousand has run but japaner never wants to pay anyone and if not much therefore it is clear that you don’t want to invest too much anymore. now your opinions are asked but objectively please.