Originally Posted by TIREGUY1991
Here's a pic.
There are no deformations in the seal area.
Right where the black arrow points the plastic tank only has 1/8" seating surface against the aluminum pump body.
There is an O-ring just before the 10mm tank bolts where the plastic tank appears circular.
Looks like the bolt pattern is spread out to far to get an even seal. You could try a harder or softer o-ring. Just make sure that it is the correct size. Also make sure that the sealing surface and o-ring grooves are smooth, have no nicks or dirt on them, any scratches on the surfaces will cause a leak. You could try to contact the pump manufacturer to see if they have a fix for the problem. McMaster-Carr
has o-rings, any size you want. I was wondering, could the plastic tank have a hair line crack that is not visible?
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