They were common in some OEM carb’d applications in the late 60s through the 80s. Just for conversation’s sake….Im talking something along the lines of a Wix 33040.

Question about how they work, is there a valve inside that’s set to bypass at a certain pressure? Or is it just a small orifice that’s always bypassing some small volume of fuel?

I sort of imagine it being the latter. Was thinking about incorporating one as a guard against heat-soak fueling issues.

1951 3100