It probably is an injector seal problem but there is another possibility. I was having a similar problem which I traced to a suspect fuel hose to fuel filter housing seal combined with a tank venting fault. Initially wiggling the fuel hose at the filter when it wouldn't start got it going but after a few weeks this was not enough. These seals are in the filter housing cap and don't seem to be replaceable so I replaced the cap. There was more likely to be a problem starting if the car had been standing for a day or two and the previous trip had been a long one. I had noticed for a long time that when refuelling there would be an inrush of air into the tank when I took the filler cap off but had come to regard this as normal. I had checked the cap by sucking and blowing on it and it appeared to be venting normally but it can't have been when it was screwed back on the car. I had less trouble starting if I had opened the filler cap at the end of the previous trip to fill the partial vacuum which had formed in the tank. I fitted a new filler cap as well as the filter cap. I don't get the inrush of air any more and it is starting reliably again. It looks as though the vacuum in the tank after a long run was drawing air into the filter housing through the poor seal while the car was standing afterwards. When I next tried to start it would run for a second or two on the fuel in the pump but would then pull in the air in the filter housing. Purging that would take a lot of starter motor churning.