case 580 super L series 2 fuel transfer/lift pump question

Our machine lost power today and stalled. Seemed like maybe a fuel filter issue? I replaced both fuel filters. I went to prime filters up with primer and noticed the rubber pump cover is dried rotted and shot. I remember awhile ago reading on here that if the rubber is cracked and ruined it will let air back in when trying to prime. I could get fuel to come out of the bleeder screw and machine would start. Then loose power again. I primed and get more air and it would start then same thing....

case 580 super L series 2 fuel transfer/lift pump question

case 580 super L series 2 fuel transfer/lift pump question