C15 6nz Coolant in fuel separator

[ababajoni]

(04-18-2019 )multitask Wrote:  Guys have a Freightliner century with a C15 6nz, today my brother and I were doing a service and found the fuel filter and separator full of coolant! What can it be and where should I start?

I think she may have a fuel cooler behind the left side tank will chase the lines tomorrow. Had a mate say could be injector cups/orings?

Anyone have any idea? Spewing we’ve had this truck for years and has never missed a beat.

Thanks

I just had a friend call me and tell me he had coolant in his fuel he has a cummins 2350 with 325000 miles on the way to peterbuilt and I told him goodluck but he should take a look at this blog.