some of those pumps pull to much vacume - we have gaged them and only let it pull 10 inches ( modify a bleed off ) -- never seen the directions on one -- to much vacume will suck in the ( cork / rubber ) gaskets under the intake front and rear - if you used silicone than that wont happen -- they work well some motors respond and some don't i hope yours does -- but if it does nothing than you may have another issue to look at -- hope you dont mind just been doing this a while and seen a lot --- jz
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