My 1990 41s5 has a off engine fuel filter mounted on adjacent engine box. It takes a NAPA 3166 filter - Its marked made in England CAV . IT also has a black fitting on bottom with 3 wires coming out and disappearing into engine wire mold. Are these wire needed? What are they for and where do they terminate?? Did the Benny 41s5 come with this or is it owner added? I have a electric low pressure fuel booster pump . Where should I install it? Thanks.