<human>: Can you give me a shortened version of the text?

Hey PF, this is my first post on this subreddit. I am 19 years old and work in retail. In a good week, I will work 20 hours and I'm making $7.90/hr before taxes. In a typical month I'm bringing in around $450 and I pay my mom $250 for insurance and rent. My big problem is I have no emergency fund. I use about $150 a month in gas, so I am lucky if I have an extra $50 at the end of a month. What can I do to start an emergency fund with what little money I do have left over? I expect about an $800 income tax return in about a month, but I plan I putting half towards student loans (as I am in my 2nd semester of college) and hope to at least pay of the interest I've accumulated in loans. Is this a wise decision or is there something better I can do with my tax return? I need an emergency fund because I have horrible luck with cars (my rich grandfather just paid $3000 because I needed a new engine). So my big question to you is: how can I utilize my tax return to start an emergency fund and pay back student loans?
<bot>: I have about $50 in free money a month and am receiving a $800 tax return. How can I use it for an ER and to pay off student loan interest?