OM606- Sanity check fuel line air leaks
OM606- Sanity check fuel line air leaks
It seems u can't figure out why that bleeds off during overnight.
Question is, this fuel supply system is complicated but got no magic in it.
1st: the conection O ring rarely are cause of leaks, after 20 years they may need replacement.
Nevertheless there are 2 week spots that usually exibit air leaks or bleed. This is the O ring in the scren filter, nr 29 in the picture above(MB sels both screen filter and Oring as one part). Other is the check valve on pump return nr 125. The banjo bolt has a check valve prone to failure.
The lift pump also has check valves, but this last one lifetime and do not play any role in the overnight bleed issue.
If u replace this 2 units i can guarantee your problems will dissapear.
Good luck
FD,
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It seems u can't figure out why that bleeds off during overnight.
Question is, this fuel supply system is complicated but got no magic in it.
1st: the conection O ring rarely are cause of leaks, after 20 years they may need replacement.
Nevertheless there are 2 week spots that usually exibit air leaks or bleed. This is the O ring in the scren filter, nr 29 in the picture above(MB sels both screen filter and Oring as one part). Other is the check valve on pump return nr 125. The banjo bolt has a check valve prone to failure.
The lift pump also has check valves, but this last one lifetime and do not play any role in the overnight bleed issue.
If u replace this 2 units i can guarantee your problems will dissapear.
Good luck
FD,
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