When you pump your primer pump the air exits a small hole on the primary (big) fuel filter housing, not sure where, doesn't matter, but you will hear a difference in the sound when your pumping. You can still get the old "screw down" type but I would stick with the new "black handle" one, more better

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"