FP reg
Buz,
My fuel pressure problem came after the engine had set for about a year. When I finally got around to changing the pump, I pulled the old one apart, just to see what was inside. Our local A&P said he had never seen the inside of one as there are no repair kits; it is strictly a replacement item. If there is any regulator inside, I couldn't find it. The pressure seems to be regulated by the spring pressure on top of the diaphram. I could be way off on this, but that's how it looked to me.
Bob Kelly