Hello,
The fuel pump relay ground for the control side of the relay is provided by the vehicle's Power-train Control Module (PCM) or "computer". In the diagrams down below I have included a diagram of a typical 4 pin relay, the wiring diagrams for your vehicle's fuel pump circuit (all the wires are highlighted for you), and guides on how to find opens in an automotive electrical circuit and how to find unwanted resistance in an automotive electrical circuit using the voltage drop method, which is the preferred method, by far. Please go through these guides and check the fuel pump circuit for these conditions and get back to us with what you are able to find out.
Thanks,
Alex
2CarPros
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Saturday, August 17th, 2019 AT 2:30 AM