Electric Fuel Pump Shuts Motor Off

The circuit must not be fused if it draws so much and on 1 Circuit then kills the engine unless it has a very large fuse. The factory wiring under the dash for keyed hot is not designed for such a load on its own. The Fuel pump can be on the same circuit "keyed-switched" but it needs its own power source by using a Bosch Style Relay. The ignition will pull the coil closed in the Relay and then it will draw its power straight from the battery. The keyed on or switched on to power the relay will draw under 1 amp to pull the coil in the relay and bring power to the fuel pump. Regardless of your problem. It needs to be wired in this way. Something to check.