I was able to purchase a 4an size fuel return check valve from Improved Racing to replace one hidden in hose. The valve has a .04 crack pressure. Seems to be working fine. Can be ordered with barbed fittings.
https://www.improvedracing.com/high-flow-low-cracking-pressure-flapper-check-valve-6.html
Can I ask what problems this eliminates? I read earlier today the return line can siphon the carb while sitting? Can it interfere while driving? Say up a steep grade for example?
Quote from: KootenayKev on March 19, 2025, 05:17:46 PMCan I ask what problems this eliminates? I read earlier today the return line can siphon the carb while sitting? Can it interfere while driving? Say up a steep grade for example?
Not to my knowledge, but I've got a different carburetor. I got rid of the fuel line check valve and the line won't siphon the carb dry even after a week of sitting. My car is wheeled on steep grades and driven up steep hills on the road, completely fine.
If anyone is looking for one, I found these one ebay, for use with regular fuel hose
https://www.ebay.com/itm/314315356308