Re: What is this?

Posted by Owen_Dyneto On 2014/11/26 23:29:44

Some have stated here that the vacuum is typically taken off the fuel pump, is this correct?

Yes, the upper half of the mechanical fuel pump is a vacuum booster pump. It's in series between the manifold and the wiper motor and it's purpose is to provide vacuum to the wipers during periods of hard acceleration when the manifold vacuum drops.