I would most likely hook terminal 86 up to the ballast resistor

terminal 30 is hooked to battery power (starter relay)
85 goes to ground
87 goes to your pump

It sounds like for what ever reason your chosen switched power source isn't getting power.... Reason I'd use the ballast is you don't want power in accessory position like most stuff under the dash... & the relay draws so little power it won't effect anything.... I you want to have a over-ride switch to shut the pump down hook it up to terminal 85 so the ground is eliminated.. If you decide to add a inertia (crash) switch it also would go in the terminal 85 lead...