There is in no way to even have the need to turn the pump on and off..Its not like you are using more fuel if the pump is on and you are not boosting..Thats the job of the fuel pressure regulator. An inline pump just helps the intank pump, and the inline provides much higher flow, and pressure capabilities over the stock pump. Both can be used at the same time. The fuel pressure regulator is basically a pressure sensitive bypass valve. When you are not boosting, the FPR is "bleeding" off all unused fuel/pressure, keeping the fuel rail at a certain fuel pressure. Now, when the boost kicks in, the boost signal is sent to the FPR, and then the FPR starts to close off the internal valve of gas flow back to the tank. This in turn raises your fuel pressure. The more the FPR "blocks" the fuel flow back to the tank, the higher the pressure. The pressure gets higher because your inline pump can do that. So when you are not in boost, there is a lot of fuel that is ciculating the entire fuel line system, because both pumps are pushing lots of fuel. But since the FPR's internal valve is wide open, all the fuel is bled off the fuel rail, and you get lower pressure. Its in no way hard on the fuel system. What most of us do, is hook up the inline pump right after the stock fuel filter, right inline with the fuel feed line going up to the stock fuel rail. Then, at the stock fuel rail test port, you connect a fuel line, and run that to the FPR inlet. Then on the FPR outlet, you run a completely new line that goes back to the gas tank return line barb, right ontop of the fuel tank, under the back seat metal cover. Hopefully this clears things up a bit.