Because I would most likely spill I do not fill the Secondary Filter at all. I just pump with the hand primer.
If I happen not to have pumped on the Hand Primer enough and got some Air in the Hard Lines I loosen 2 of the Hard Line nuts at the Injectors and crank a bit. Tighten the Nuts and it starts.
I have never loosened the return Banjo Bolt and used the hand Primer until Fuel Comes out just to bleed the Air out.

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84 300D, 82 Volvo 244Gl Diesel