ok theres 3 things by the fuel filter that look like they could be it...
the oil filter is the green arrow
the blue arrow thing looks like 2 wires smushed beneath a metal plate going to the side of the engine
the yellow arrow is a little black box thing bolted to the side of the engine with 2 wires coming out... we couldnt get the clip off to mess with it at all...
the red arrow is a cylindrical thing coming out of the engine... we pulled the connector off it and there were 3 wires connecting to it inside the connector... and the car would not start with the cap off..
know which of those is the sender?