that has happened to me 1ce with them tbh.
other than that i tend to take the old part off and take it with me to them for comparison with the new.
also noticed that sometimes it fails to start and cranks very slow, as if the battery is dieing !!
but if i leave it for 5-10 Min's starts first time.
other times it starts 1st time.
the fuel pump does prime as can be heard.