I have several issues I'm seeking help on...

I filled my truck up, put the switch on the front tank and drove til it
ran down to a 1/4 of a tank. I then switched it to the rear tank and
drove for several days and then noticed that it was down to a 1/4 of a
tank. I switched it back to the front and it showed full. I drove til it
was down to a 1/4 of a tank and then filled up. I did this a couple of
times and it kept doing the same thing. I then put the switch on the
rear tank, but that caused gas to come out of the front tank at the site of fill up, so I switched it back to the front. The front showed full for days
so I switched it to the rear and it was going down.
Any suggestions??
and
When I try to start my truck I turn the key and it struggles to start,
so I back off and turn it again and it starts. It does this 9 times out
of 10. It has a remote starter on it and when I use it, it doesn't seem to struggle when it starts it, maybe 1 time out of 10.
Thanks for any help...

Peggy