HYPRO D403GRGI pump sucking oil in from gauge

ted putnam

LawnSite Fanatic
sounds like diaphrams are not seated properly...heads on snug? I Always have to "burp" my D-30 when replacing the diaphrams. As bad as it sucks, you may have to take it apart again. If so, double check the diaphrams for damage.

PS As stupid as it sounds, make sure they aren't installed backward. The "oil" side of the diaphram should have raised letters identifying it as that.