[whitelightning603]

Thanks for the replies. This is the tank selector valve that I replaced the original with. It will not switch tanks unless the ignition is off. Then when ignition is turned on, it will activate. Could the pumps be overpowering the selector valve and leaking pressure? Do I need to place an additional filter/regulator between the tank and tank selector valve? Or could it be a faulty tank selector valve?

Product Description: Pollak Motor-driven 6-port Electric Fuel Tank Selector Valve 42-300P JCW812705.

POLLAK MOTOR-DRIVEN 6-PORT ELECTRIC FUEL TANK SELECTOR VALVE For fuel-injected systems operating up to 65 psi. Designed to prevent returning fuel to incorrect tank. Weatherproof fiberglass-reinforced nylon valve body. Valve grounds to frame. Meets or exceeds DOT standards. Fits 3/8 I.D. fuel hose. Recommended fuse: 10 amps. Can be wired so original dash gauge indicates fuel level in either tank. Includes: switch, faceplate, wiring connector, instructions. Hoses not included-order separately. 6-port valve required on vehicles with 3 lines attached to fuel pump. For 12-volt systems.