I was thinking on my eventual redneck solar/waste oil powered hot tub ( ) and was looking up hot water circulators, and lo and behold:

Solar DC 12V 24V Hot Water Circulation Pump Brushless Motor Water Pump 1000L H | eBay

or:

http://www.ebay.com/itm/Solar-DC-12V-Hot-Water-Circulation-Pump-Brushless-Motor-Water-Pump/171357570920?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D29907%26meid%3Da179b363896a4661a8677e2328b7 537f%26pid%3D100005%26rk%3D1%26rkt%3D6%26mehot%3Dag%26sd%3D181722213253&rt=nc

Which got me thinking on the high cost of the aux pumps on these cars. It has 1/2 inch inlet/outlet fittings, so it will be just about a perfect fit.

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Garage:

2017 Chevy Colorado Diesel (nanny state emissions)
2005 Volvo S40 T5 AWD, 77k
1987 Mercedes-Benz 300D turbodiesel, 4 sp auto, 156k - 28.7 mpg
1996 Tracker 4x4, 2 door, 16v, 3 sp auto. 113k - 28.6 mpg

WARNING: this post may contain dangerous free thinking.