I expect the joker valve on the output side is leaking slightly, allowing the liquid stored in the "up" side of the siphon-break loop to leak back into the tank. Not a problem if a) you pump lots of extra clean water and b) you don't have a rough enough ride to splash out.
Probably a new joker valve will fix it: under $10
Luck, Everett GB-32 "Coot" Long Beach, CA
"Michael" <zspider@gte.net> wrote in message news:1117558189.644708.21330@f14g2000cwb.googlegroups.com...> I've got a year 2000 2460 Regal and the head bubbles after> I pump flush it and that really wouldn't bother me much but> I get the feeling it's coming the gray tank and causing it> to smell. Only liquid wastes in our tank, pumped out twice> at the end of the weekend and a bottle of the purple stuff> added, used the next weekend and then pumped out again, so> I don't think the head should smell. I flush dry, then> water flush, then dry flush it again.>
What is causing the bubbling? The vent on the gray tank> appears to work fine. When I do a rinse on it, I know its> full when it pours out the vent. It doesn't pump hard. I> don't think it bubbled when I first got it.>
