Foaming return line in Fuel Delivery Unit ML320 CDI W164 at work
#1
Newbie
Thread Starter
Foaming return line in Fuel Delivery Unit ML320 CDI W164 at work
Recently I have replaced the Fuel Delivery Unit part#1644702094 by another with #1644700394. The old one was very high pitch noisy and gave me two CEL lately so I decided to anticipate the roadside risk and made the change DIY. Before closing the tank hole I decided to test, hearing and seeing it while working.
Watch video here:
Anyone can say if is it normal the foaming fuel returning by the hose that is clipped on the unit housing, or I have a line issue?
A 1644702094 Fuel Delivery Unit
A 1644702094 Fuel Delivery Unit (tag)
Watch video here:
A 1644702094 Fuel Delivery Unit
A 1644702094 Fuel Delivery Unit (tag)
Last edited by bobfig; 05-16-2015 at 12:16 PM.
#3
Junior Member
I realize this is an old post, but did you get a reliable repair? The reason I am asking is I recently did a cleaning of my EGR valve and in the process cracked the last fitting on the fuel return line. I am currently in the process of replacing it and was wondering if this could have been the source of your foaming fuel return line.