Hyundai Repair: 2005 Hyundai Sonata Fuel pump & relay, 2005 hyundai sonata, fuel pump relay

Question
My fuel pump will not run on my 05 sonata. We took the pump out and it does run when connected to an outside power source when connected to the vehicle connections, we only 4.5 volts to the pump. Looking for the fuel pump relay and the EFI fuse but not able to find either one. Any idea where they are located? Any other suggestions?

Answer
If you have a four cylinder, the fuel pump doesn't have a separate relay, but rather its relay is built into the ECM relay.  This relay is behind the center portion of the dash bolted onto the right side support bracket there.  It's powered by one of the 30A slow blow ignition fuses in the underhood fuse block.

If you have the V6, there will be two separate relays on the above referemced bracket.  The fuel pump relay should be the lower one of the two.  For this relay, power originates at the 20A fuel pump fuse in the underhood fuse block.

Hyundai's online schematics are an excellent tool for this task.  Simply register for an account at www.hmaservice.com.  When inside, go to the ETM (Electrical Troubleshooting Manual) link in service information, select your year and model and MFI fuel system.  The first page will show you the relay and additional information.  If you click on the connector number for a component, it will bring up a separate window, in which you can click on links at the top to show a diagram of the connector, a picture of the component/connector, and a diagram of the wire harness in the vicinity of the connector.