What year is your truck? If you have this wire then you have a dash light indicating you need to change the fuel filter. I have only seen my filter light come on once. Even then it slowly illuminated under full hard throttle. The way this switch works is it measures a vacuum in the fuel delivery to the injection pump.
I replaced all my dash lights with LEDs, I'm pretty sure the bulb is good. When I fix the leak, I'll ground that wire with the key on and make sure a light lites up somewhere.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.