Mike, something I did for a pump that is the ONLY thing I have not yet changed is a power steering pump for a transfer/processing/filling pump. I use the same pump for all functions and use valves to switch it's suction and exhaust points.
My pump came off of a 97 F150. I took the alternator pulley off the same truck, filled the 18mm shaft hole with cheap epoxy and then chucked it up in the wood lathe and used a 1/2" drill to drill the epoxy out to fit my washing machine motor. That pulley worked fine for a while, but the cheap epoxy was not up to the torque that the washing machine motor can put out (I used cheap plumbers epoxy). When my local WMO buddy came by to see the setup and see if it interested him, he saw the problems my pulley was giving me and turned me one out of an aluminium blank. I have since redesigned the mount from original and will redesign it one more time because I'm having a lot of trouble getting the non standard washing machine motor mounts right so I can properly tension the belt. With that said though, it is the only thing I will not totally change in my next redesign this spring, or hopefully fall.
I have replaced the pump once with a re-manufactured unit because I didn't know how to properly clean it when it got clogged with bird feathers and hay straw. I have since learned how to disassemble and clean the pump for the occasions that it gets clogged and figure it will outlast everything else in my system. It puts out way more volume than even two fuges can handle, and could easily push four of them or of course one much larger. It can fill my tanks in about five minutes and I have no clue what it's relief pressure is, but I know it can push way more than 500PSI. It can output enough pressure to flat out ruin a 250PSI gauge lol. It also has four conveintly place mounting holes that allowed me to bolt it down to a 2X6 fairly easily.
AND, in the event it ever does fail I can replace it under warranty at orielly's, and I even told them what I was doing with the pump, but honestly i don't think it will ever need anything more than an occasional cleaning.
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The really nice thing about it is it has a nice 1/2" inlet hose barb, (that can be repositioned with a little difficulty)and a good high pressure nylon reinforced exhaust hose that I cut in half from the truck. It is perfect for it's application. I turn it at well below it's rated rpm and it still has way more volume than I currently need. It has run for literally days on end and the motor nor pump complain. I have run oil through it that was so hot it smoked the paint on the pump to no ill effect. I honestly don't think you can buy a pump that will work better than it does, AND if you just go straight to the auto-parts store and buy one it's only 70 bucks. Although you won't get the handy swivel exhaust hose that came installed on the truck lol.
PS all the oil spilled is from one of its cleanings when the mixing tank intake screen fell off and it sucked in straw and other miscellaneous garbage.
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Go to Harbor Freight and buy one of the $30-50 water pumps. That's what I used for almost a year and shows no signs of stopping. Waaayyyy more power than the 12 volt pumps.
