What is this I found in my Airstream?
I don't know how much the installation of the 'Geraghty mpg performance products' Vari-flow differed between automotive and motorhome installs, but I had one installed on my '65 Dodge tow vehicle in 1980. Since the Dodge didn't have a water tank, the installation included a 1 gallon reservior that was mounted under the hood in which the water and alcohol was mixed . . . . then the metering device pumped the mixture to a spray jet that was mounted to the air cleaner housing immediately above the primary bores of the carburetor. The idea was to decrease detonation when running a high compression motor on the lower-grade non-leaded fuels. It never really made a huge difference on my Dodge and I ended up with valve recision . . . had hardened valve seats machined into the head for a permanent solution and now run the engine on premium no-lead and just have to watch my accelerator use on grades or when passing to limit detonation problems.
Good luck with your detective work!
Kevin D. Allen
WBCCI (Lifetime Member)/VAC/Free Wheelers #6359
1964 Overlander International/1999 GMC K2500 Suburban (7400 VORTEC/4.11 Differentials)
1978 Argosy Minuet 6.0 Metre/1975 Cadillac Eldorado Convertible (8.2 Liter V8/2.70 Final Drive)