Xanok

So I recently bought a beater 84 CRX.

A few gas tanks later and I am starting to see a decreace in MPG. First I got about 30 mpg, the next is about 20 and now I put in 16$ worth of gas, im on empty with 156 miles on that tank.

When I drive, I can smell fuel from inside my car. (someone said that might be because a cylinder has no compression?) And recently when I accelerate, I can feel the car studder.

Is this the case of a bad fuel pump? Or am I having other problems.

Thanks