Hard starting 2016 2.0

[Steveleckey]

Have a strange problem with my transit.Have to sit in van and turn ignition on and wait for pump in tank to stop if I don't it cranks for ages and sometimes doesn't start.Have changed pump in tank and pump modulater.Has got worse since I had four injectors replaced.Van only has 52 thou on clock and has not been the most reliable vehicle.Is there something that stops fuel draining back to the tank as once its started it starts lovely.Have checked on forscan and no codes recorded.