Is this problem my fuel pump / sender which is the complete gas tank

My truck has always been maintained circle checked etc on friday the engine stalled out and would not start I did a full check and it sounds like it was not getting any fuel ? I was able to start it again with no problem 2 minutes later on the following Monday I drove est about 3-4 hours got home about 2 hours later I went to the store on the way there the engine stalled out again it would not start it was trying to turnover but I knew it sounded like it was not getting any fuel had it towed home the next morning I jumped in the truck it started no proble I shut it off and it restarted with no problem now again as I was backing out the drive way it stalled again and seems to be a fuel problem is this problem the way I stated the many times it would stall and not start then start later a fuel pump / sender problem I did find out that the whole poly tank holds the pump / sender and if its the problem then it would have to be replaced can you help me because I was not sure if it would be a sebsor or something else as I was puzzled by the fact it would run then stall wait a while and with no problem start again ?