This mornin I have replaced the fuel filter on my mk1, I primed it with a hand pump an got the air out, car started fine and I revved it up and took it for a 10 minute drive, all is fine but when I got home i checked the clear pipe coming off the the filter while it was running and can still see air bubbles going through?? Is this normal or do I need to get all the air out somehow 😬