90 spll fuel pump rebuild

Hvymtl

Petty Officer 2nd Class
Joined
Jun 6, 2011
Messages
147
I have a 1996 90 spl with no VRO. Just rebuilt the fuel pump (simple vacuum pulse pump) with the simple Sierra kit. Now I have gas leaking out what I assume is a vent hole in the top of the pump where there is a small spring and plunger....didn't do that before. What I have done wrong?
 
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