I run 2 Alamo pumps, a 30 and 75 on 6.5HP Hondas. However I do not use the original tank. I remove that tank and build as wooden stand next to the pump and I put one of these on the top http://www.surpluscenter.com/Engines...-28-1836-R.axd
On the smaller pump I get about 17 hrs and on the larger pump I get about 14 hrs. per fueling. I run the engines at about half throttle.
I think a Delaval 73 would use about the same.
I find it more efficient to have the gas engine on the pump, with a generator it must run at full speed even if less amperage is needed just to get the right cycles, unless you use an inverter gen.
Dave Klish, I recently bought a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.
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