2001 Chevy Suburban Scan Code P0105 on '01 1500 Suburban w/

Hi Car Guys,
I have a '01 suburban 1500 w/325. Has 168 miles, great truck, been very dependable! Just will not turn over. Did once for me to move a few feet.
Scan Code is: P0105.
Was told to replace the map senor, did that, still will not start.
I thought it might be the fuel pump?
It's been hard to start in morns, and after 30 minutes after parked. Have to pump gas peddle a few times and then slightly turn key quickly & release.
Now I can not get it to start at all even with new map sensor?
Have any advise?
Thanks,
pete valletutti
972-200-5544
thebikerbroker@yahoo. Com