Jeff7
OBS Enthusiast
I posted this in the stupid electronics thread but figured I might be better getting an answer in the engine section, this is what I posted...
So after seeing the thread about the hummingbird fuel gauge fix I decided to try and fix my fuel gauge. It reads over full when it's first filled, and sometimes (not when full) it will sporadically jump around anywhere from 1/4 to past full, otherwise it stays on full. I think it may be the sending unit but I would like to confirm that. From what I've been able to find (I have a 98 K1500 350) the sending unit is supposed to read 0-90 Ohms and it is the thinner ground wire and a purple wire (I'm guessing the purple one is the second from the left since that's beside the thinner ground wire), a shorted wire would always read empty and a broken wire/circuit being infinite Ohms would read over full.
So this is my stupid question, can you test the sending unit without dropping the tank? I tried sticking my multi-meter needles into where the wires meet the plug but didn't have any luck. Is there somewhere under the hood I can test (had a hard time following the wires), or should I try unplugging it maybe? If it is the sending unit I won't bother replacing it until my pump goes again so I'm not going to drop the tank out, but I'd like to confirm that so I'm not driving around with useless fuel gauge that could have been easily fix due to some other reason.
Thanks.
(This picture uploaded upside down, so were looking at the 4 pin connector, I'm pretty sure I want the 2 wires closest to the inside since the wire furthest out is thicker than the rest)
So after seeing the thread about the hummingbird fuel gauge fix I decided to try and fix my fuel gauge. It reads over full when it's first filled, and sometimes (not when full) it will sporadically jump around anywhere from 1/4 to past full, otherwise it stays on full. I think it may be the sending unit but I would like to confirm that. From what I've been able to find (I have a 98 K1500 350) the sending unit is supposed to read 0-90 Ohms and it is the thinner ground wire and a purple wire (I'm guessing the purple one is the second from the left since that's beside the thinner ground wire), a shorted wire would always read empty and a broken wire/circuit being infinite Ohms would read over full.
So this is my stupid question, can you test the sending unit without dropping the tank? I tried sticking my multi-meter needles into where the wires meet the plug but didn't have any luck. Is there somewhere under the hood I can test (had a hard time following the wires), or should I try unplugging it maybe? If it is the sending unit I won't bother replacing it until my pump goes again so I'm not going to drop the tank out, but I'd like to confirm that so I'm not driving around with useless fuel gauge that could have been easily fix due to some other reason.
Thanks.
(This picture uploaded upside down, so were looking at the 4 pin connector, I'm pretty sure I want the 2 wires closest to the inside since the wire furthest out is thicker than the rest)