Fuel filter, to prefill or not to prefill?

[jimbo2013]

Rich, when the filter is rusty.....................time to change

[Dr4Film]

Yeah, I know. They are rusty due to power washing the engine compartment, not from age or use.

I had an LOF done by Speedco in Fernley NV back in December 2012 before leaving the Amazon job.

Came to CA and have been sitting at my volunteer job since then. I plan to have a new LOF done by Speedco on my way north to Alaska next spring.

Most people would recommend changing it before then based on age but I'm not a total believer of that same philosophy.

Dr4Film ----- Richard

[CountryFit]

phew, got it done... i prefilled both FS1022 and FS1212, but i used a medical syringe to suck the fuel from the center of old filters and injected into the perimeter holes of the FS1022 (this is the one cummins says do not prefill). i made sure i didn't touch the center hole and no single drop of fuel went to it. yay, after done, it started on the first attempt.

[CountryFit]

richard - i discovered that the larger one, FS1022 has a sensor attached. by tracing the hoses it confirmed the smaller one FS1212 (20 mc) is the primary and the larger one FS1022 is the secondary (10 mc). this makes perfect sense in fuel flow, and that's why cummins does not want people to prefill the secondary but prefill the primary. mine is the same with yours except yours is 10/10 mc, mine is 20/10 mc. mystery is resolved