What actually happened was, the screen held the bolt back for many 1000's of miles then eventually the back and forth rubbing action allowed the bolt to cut a hole in the screen and enter the pump: KILLING THE ENGINE! It wasn't a problem with the pump or the pickup but with the bolt that did not have loc-tite on it from the factory and fell into the pan. The last one I took apart had 4 bolts that had come loose, but it only takes one to kill it!
ASE CERTIFIED MASTER AUTO TECHNICIAN
LEAD TECHNICIAN FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM