Originally Posted by Vector
It worked fine with cold tap water.
I turned on the propane and heated the water.
I turned the pump on at about 120 degrees. Everything was working great until the water got about 180 degrees and the pump stopped pumping.
I cooled the pump by running cool water through it and it started working again.
Tried the heated water again and it stopped pumping at about 180 degrees.
Can anyone offer suggestions?
Chuggers are basically March clones. This problem happens on March 809s due to tight shaft/impeller tolerances. As seen in this post
by Walter @ March, ream the impeller bore out to increase the tolerances. Mind you, that bit size may not be correct for a Chugger. It doesn't take much, so be careful.