Posted 8/22/2021 20:58 (#9179205 - in reply to #9179179) Subject: RE: Freightliner FLD 120 with 12.7 problem.
Central ND
There is a fuel check valve that causes problems on those is where i would start, right rear corner of the engine. Typically if it's got something in it it loses prime after a few hours but it's a cheap place to start