Mower Keeps Dying

Got a Hustler Fas Trak SD model 928267 that is kicking my butt. Got it out this spring and it wouldn't start. Found out the battery was bad so I replaced it. Topped it off with fresh gas and it started right up no problems. Pulled it outside, engaged the deck and it died. After that it would start but spit and sputtered like it was starved of gas. After a couple of hours it started and ran fine. Pulled the deck button and same thing happened. Noticed that there was very little fuel in the filter so I thought maybe the fuel pump was going bad. Put a new one on and the same process happened again. Had a guy suggest to replace the fuel lines on one side to see if one was collapsed. Replaced it on one side, mower fired up, went outside, engaged the deck and it kept running. Figured perfect, that was the issue all along. Started mowing but every time i hit a bump it would start spitting and sputtering but never died. Made it through the whole yard and got it put away. So then i started to think maybe a safety switch but I didn't think that fit the problems before. Yesterday, it started fine, pulled it outside and when I leaned back in the seat it made it spit and sputter and then it died. I was able to get it to fire again but it would run rough and die. Made me think it might be the seat sensor. Let it sit for about an hour and then it fired right back up. Engaged the deck which made it run rough again. Was able to get it back into the garage before it died. Just baffled at this point. Any help would be appreciatted
It's interesting that it is sputtering on bumps. This may be a ridiculous suggestion, but have you checked the terminal connections on that new battery to assure they aren't slightly loose and that the connectors are clean. My suspicion is aroused because if it's not any of the other issues you've mentioned, the jarring on bumps is having a direct effect on either the fuel delivery system or the electrical system. Just a thought! 😀
 
Well it has finally been fixed. Knee was feeling good enough to mess with it last night so I swapped out the carburetor. Started right up and ran fine for about 5 five minutes. Shut it off and let it sit for a couple mins. Started it back up and it continued to run good. Mowed for about 10 mins. It never sputtered or bogged down once. Parked it for a few minutes, started it back up and she ran like a champ and never flinched. Appreciate all of the helpful advice and feedback.
 
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