Cummins says about by-pass
Here is what Cummins sent me regarding a by-pass system:
Thank you for contacting Fleetguard.
Steve, Cummins Engine Company neither recommends nor encourages the use of by-pass oil filters on the B engine
because improper use of the by-pass lubrication filter, it MUST meet the following requirements:
A. Oil flow restricted to 1 GPM by using a 2 mm orifice in the by-pass filter supply.
B. A check Valve in the supply line which only allows flow to the by-pass filter supply.
For more information on this issue you may call Cummins Technical Service at 800-343-7357.
If we can be of further assistance to you, please feel free to
contact your Fleetguard Customer Assistance Center or send a
message to FleetMaster.
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http://www.fleetguard.com
Sincerely,
Fleetguard FleetMaster