I thought that the dual action pump was an option, and if you won't be using it then what's the point?
Personally I'd simplify to a plain fuel pump with the glass bowl on top, or keep the dual action pump and use it for vacuum as designed.

Grigg


1951 GMC 250 in the Project Journals
1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-