I was following the workshop manual, and it said "note the location of each injector". So I wrote number 1-4 on a piece of card and started to put them on in order. I took out all 4 but then i got confused as to whether 1 was the bumper end or 1 was the bulkhead end :|... I "think" I have them in the correct order, but in my confusion there's a possibility I've mixed them up all together. What happens if they go back in a different order ? I don't understand how they work. 
