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I wish I would've had access to those fittings. You are correct on the line connection. It is an M16 O-ring style. I contemplated changing over to the proper fitting but have had zero issues with the current setup. I did return your message and I believe you may have your connections backwards...

oh and priming procedure is identical to the factory Model 80. In the first pictures you can see a petcock in the filter head right above the white arrow on the filter collar. When you change filters, just fill it up with diesel, put a hose on the petcock and drain the air out, while you crank...

I had to alter one connection on the truck as the one connection looks like this. And the connectors on the filter mount itself were a flat style pin whilst the the 2nd truck connection is the normal pin style connector. There is only two fittings going in and out. The other ports were never...

I use a factory gm supplied FM100 that was used on the 6.5 diesel vans. It was cheaper to buy then ordering a fm100 from a dealer. Has the fuel heater, water in fuel sensor and not to mention the filters are easily bought at stores as you just get a normal fuel filter for a late model 6.5 diesel...