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Well depending on your set up, hopefully your pulling from the top and have a bulkhead fitting on top of your 100 plus gallon roof wash tank. I think the delavan will pull up to 8 to 12 or so depending on if you have the 5850 or the 7800 series fatboy. Look on the thread for delavan pumps and you will see some photos of different setups. Make sure you have 10 gauge wiring to your battery and pump with a switch. Get you some teflon wrap for those fittings also and mount your pump on a flat surface, there is some ideas people used a plastic battery box to pump there delavan pumps in. I never did that personally because of heat reasons. I recently went to a air pump but the fatboy is a beast to use. I hope this helped but there is a lot of info on the delavan just put that in the search and it will lead you to what you are looking for.

I agree.  I don't think it's necessary to have them mounted upside down (though it makes perfect sense).  However, I don't have mine flat either.  It's slightly tilted with some PC fans I rigged up to survive these hot days we've been having.