i have a 2000 Civic LX and when there is less than 1/2tank of gas, the car doesnt want to start. with more than 1/2tank of gas, it starts easily, instantly at the turn of the key. but with less than 1/2 it takes a few seconds of cranking for it to finally turn over.

my initial guess is the fuel pump?
can someone help me out.
thanks

 

My car has this issue regardless of how much gas I have in the tank - I have a gsr swap in a civic. What I do is turn the key to the last notch (so that all dash lights, etc turn on), let it prime for 3-4 seconds and then turn the key full turn to start. Works like a charm every time.