Sam,
List some of the symptoms your car is having, so people can come up with ideas for you. In your car, look for fuel "clogs " in the pre and cannister filter
or in the tank if you have been running with really bad fuel. By "fuel pump"
I'm assuming you mean Injection Pump, which is attached to your engine. You probably won't have any DIY parts in there. Also, state where you are,
if it's reaaly cold, that may contribute to your problems.

Steve