Quote:
Originally Posted by Brian Carlton
The proper way to prime the system to the secondary filter is to crack the outlet fitting on the secondary (there's an arrow pointing out) and pump the primer pump until no air is observed.
If you simply pump the primer, as others have suggested, the air in the secondary has nowhere to go but onward to the IP.
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My experience has been that the priming can be done without opening any lines. Eventually the IP and filters fill with fuel and the relief valve opens and returns whatever needs to go back (air bubbles or fuel) - that's when you get to hear the buzzing noise on every pump and the primer is hard to press down - that's how you know it is primed.
I also know some people say to open the fitting on the main (spin on filter) outlet which is what I think Brian is saying to do...that will work too but I have never done this and always just primed by pumping until I heard the buzzing of the relief valve and never had a problem.