im having the common problem of car not starting every now and then on my 320d 2001. trying to find the problem without buying things thats not needed. i havent scanned car yet as waiting for lead to come, hopefully today. ok have read to rule out fuel relay as the problem, swap with horn relay, but my problem is cant find out which is what relay. there are 4 relays 3 green and one red can someone let me know whats what. i have taken photo. car wouldn't start last night and i ran battery flat so had to call out recovery. guy said stright away it's your pump under back seat. great if it is, but not sure the guy really knew the car as i know there are two pumps and the relay. can the pump under back seat be the problem. as far as i can tell there is a noise coming from passager side pressure pump when it wont start but be 100 % sure as testing is hard as it might not do it again for few days and normally wifes got the car. today car has cut out 2 times when driving, never done this before. it started again about 5 trys later. when the car starts it will always be first turn starting. could it also be fuel filter as read most of time there never changed from new. any help will be thankful.
just removed back seat to find two fuel pumps :O anyway checked voltage on them and feed to both says 11v