u need a 22-24 mm crow foot, only 2 sided wrench will fit, and it does not have a lot of space either.

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Unfortunately even with the correct sized Crows Foot the Hand Primer with the soft Shiny Aluminum body often deforms instead of turning when you apply force on it.

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84 300D, 82 Volvo 244Gl Diesel

I had to use vise grips, crush the pump, and twist it out.

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1969 220D - 4spd std
1973 220D - 4spd std

Post #9 or a Vice Grips are the 2 common methods when it will not come off with regular tools.

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84 300D, 82 Volvo 244Gl Diesel

I ended up using a rubber strap wrench the last time I switched mine out... I sprayed the old one with parts cleaner first to make sure it wasn't slippery