Not cheap I know but I had better luck with this regulator then others I had been using for my dual 38mm weber set up. They really do need to be at 3-4 pounds max.

https://aeromotiveinc.com/product/low-pressure-carbureted-regulator/

less expensive regulator

https://www.vintageinlines.com/product-page/weber-fuel-pressure-regulator

and the Redline regulator

https://www.carburetion.com/products/ProductDetails.aspx?Part=31800.050

Last edited by mdonohue05; 01/05/23 10:07 PM.