OK, Denny, I am counting on your logic and skills.
Here is a quote from the H.A.M.B.: "A vacuum canister with check valve plumbed into the line, mounted on the firewall or up under the dash, can give you 10 to 12 additional swipes and takes out most of the hesitation related to their operation."
How big a tank for 10-12 uphill swipes with a well-maintained wiper motor?
How big a tank for 20-24 swipes.
The hydrovac system on my 2-ton 54/55 GMC has a reservoir-tank that is about 1/2 gallon.
A dual-action fuel pump with a reservoir tank might be nice?
