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Message: [QUOTE="TARM, post: 32673, member: 578"] What are the check valves for? From what I have checked and at least one other person I know of the sd pumps do not allow back flow so no chance of creation of a bf loop should one pump go down. In fact that exact senario was tested with no issue. Put a ball valve right before the water fuel sep between tank and it. That wil prevent loss of prime ona filter change. I really like the idea of a switch when running more than one pump. If one dies it can be turned off to prevent overload of the fuses relay etc. Keep you from having to get underneath and dissconect while out. If you really want to do it right add a psi guage between each pumps output and the final filter. It will allow you to know which pump is down at a glance. Of course you could just switch power between the two with the switch and watch your main psi gauge for a drop in psi. As I said there are many ways to configure a system to meet your personal pref beyound basic fuel supply. [/QUOTE]

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