[jhv48]

I too had the same problem with my FFR. I Put in a larger overflow bottle and that solved that problem.

Same thing with my SPF. If I filled the expansion tank more than 3/4 full, it would puke some out. Installed a recovery bottle and now the expansion tank stays full, and the excess is forced into the recovery tank. Make sure you get one that holds at least 32 ounces.

If this doesn't help, then we'll have to dig deeper. Start with the simple stuff first.