I have to pump the gas pedal 20-30 times to get it to crank.

What you just said makes no sense. pushing the gas pedal 20-30 times will not make a difference as to whether you can turn the key and then have the engine spin/crank. I would have the fuel pump pressure and volume checked and then see if your lack of changing the fuel filter in a timely manner has caused the pump to overwork trying to push fuel thru the clogged filter. Do you know when the filter was last changed-I mean miles ago and what is current mileage.

on the right side of the gas tank under right tail lamp under a plastic cover in the body there is a check valve where a return line to your gas tank from your carb. came lose and is up side down or side ways or is bad.