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Re: 1982 K10 6.2 Diesel build
FYI, the big filter is the primary and the one on the engine is the secondary. They make quadrant o-rings for those fuel lines I'm pretty sure to seal it inside the housing. Perkins diesel uses the same set-up. Take a pic of the end fitting when it is out of the filter housing. If there is a little pipe nipple at the end of the threads, it is designed for a quad o-ring to seal properly.
Also the filters have different micron ratings: primary might be around 15-30 microns and secondary is probably 10 microns. Don't run without secondary too long or you risk sending bigger particles into the injectors and shortening their life.
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