Oil leaking around the HPU high-pressure filter area after changing the element.

PROBLEM

 

Oil is leaking around the HPU high-pressure filter area after changing the element.  


ANSWER

 

Could be the O-ring needs to be replaced also.  If the O-ring was replaced check to see if the retaining ring was also installed.   The white hard plastic backing ring (AKA RETAINER-PACKING, BACK-UP FILTER BOWL) holds the O-ring in place while the filter element is being installed. 

 

Without this, you could damage or distort the O-ring ruining the seal while installing the filter element.  If this is missing or if the O-ring is missing it could explain leaking.   

 

The retainer goes on the low-pressure side.  The O-ring will face the high pressure. 

K
Keary is the author of this solution article.

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