The only other things on that circuit are your PCM(power control module) and the fuel pump/oil pressure switch. You can start with that but it is more than likely a ground somewhere on that circuit. If this helped four thumbs up please.
Somewhere you have a ground fault in the wiring system. Sometimes if the O-ring on the fuel pump assembly is bad it allows a improper ground. Be sure to also check the fuse box wiring to assure that all grounds are tight. Some fuse boxes have multiple grounds.
this is for the fuel system, relay for the injector is nearly the same.
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Your vehicle might have a fuel cut-off relay, it is usually mounted out on the frame near the fuel tank, on the firewall, or sometimes around the battery, and it looks like what is is this picture. Let me know if that is, or is not the problem.
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