I have an 03 mustang V6 that the fuel pump went out I've changed six fuel pumps the fuel pump relay module over the back tire driver side as well as the inertia switch I've changed the electronic component on the ignition the camshaft sensor the crankshaft sensor the brain box I've had someone run diagnostics and I have power everywhere to the fuel pump but get no action from the fuel pump the black and red wires are hot and the two yellow are not I believe I have that right the gauges work but it will not kick on or send fuel to the engine I'm at a loss and I hope someone here can help me. Could it be vapor lock what am I overlooking