99 Jeep grandcherokee laredo stall when turning on, fuel gage reads gas wrong when it hits lower then quarter

My jeep stalls when I try to turn it on, I can turn the key a few times and it will only stall for about a few seconds as opposed to 10 or 15 if I dont, I was driving down the road and it stopped running about a month ago, put gas and had no effect, found out it was the fuel pump and got it replaced, but about a week later after having the fuel pump replaced it started stalling when I turned it on, and a few days after it started to stall my car got just a little under a quarter of gas and it stopped running, I put gas in it and worked just fine, It even went till the light turned on without running out of gas, but I filled it up and this time half way thru my last quater it went out( marking a different spot on gas gauge from the previous time it ran out ), I put gas and it was working again, but it still stalls and I dont ever let it go anywhere under or close to a quarter of gas now, and just last night my check engine light came on and today it turned off. Can anybody tell me what the problem is and how much $$ it cost to fix?

It's also been really really bad on gas since that started, I know somebody that had a hummer and always complaid about his car using to much gas when actually I think mine has been worst since the stalling started.