I put $10 in gas and immediately then my car broke down (not because of the gas, it was already acting funny).

I feel like I have thrown that money into the trash! I want to get the gas out and sell it to a family member for the same price, I just need to know how to get it out.

does anybody know how much these things cost,really dont want to be done over at the garage.
renault megane 1.6 sport

My car is having problems starting. When I get it towed to a mechanic, it mysteriously starts! This has happened 3 times already. I am fed up. I have heard that it may be my starter, battery, or fuel pump. But what ever they fix is not guarenteed. I don’t mind spending the money (about 500 for a fuel pump) but if it isn’t guarenteed, I don’t want to waste the money. Any suggestions?
My car will turn, but it won’t start.