Carburetor Spacer for Weber DGV - 7MM

The carbs on B18s and B20s are very sensitive to overpressure, which is compounded by fuel heat-soaking and expanding in the fuel lines routed over the hot parts of the engine and in the carburetor itself in direct contact with the hot intake manifold. If you have problems with fuel overflowing out of your float bowl, it could therefore be a pump overpressure issue, a fuel heat soak/expansion issue, or a combination of the two. 

Insulating the carburetors from the intake manifold with these phenolic spacers is a good idea no matter what. If you're still having fuel overpressure issues, you can also try an inline adjustable fuel pressure regulator (see Recommended Products below) and rerouting the fuel-pump-to-carburetor fuel lines so they're further away from hot engine parts.

Additional Keywords: PHENOLIC