My 1964 Impala 409 (dual quad) fuel pump is leaking. I got info from Carter Engineering and found a Spectra replacement pump. The Spectra pump has an extra fitting on the top. Is this a vapour return line?
It was used for vapor return to the air filter or spark arrester on the Marine engines.Fun fact;It can also be used for boost refference for a low boost[up to about 8 psi] centrfical blower or turbo set up.
