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Discussion Starter #1
I was on a trip and I got diesel with my engine running, my fuel gauge flipped out and went way past full. I stopped at another gas station 35 miles later and turned off the truck. I would not start after. Its reading insufficient coolant code now . Ideas? Do I check coolant sensors first or drop the tank?
 

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I was on a trip and I got diesel with my engine running, my fuel gauge flipped out and went way past full. I stopped at another gas station 35 miles later and turned off the truck. I would not start after. Its reading insufficient coolant code now . Ideas? Do I check coolant sensors first or drop the tank?
I would first go through all of your grounds.
Removing each one. cleaning the contact points and then reinstall.
If you find any in bad shape or are in questionable condition then replace them.
Use this link for reference:
https://www.dieselplace.com/forum/showthread.php?t=163087

Also, go through all of your battery connections and make sure they are clean and tight
 

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Discussion Starter #3
I figured since the gauge is pegged it would be a short.

I just unplugged the fuel tank sending unit and my gauge is still pegged, doh
 

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When the fuel gauge signal is lost the gauge will peg full, key on.
Short the purple and black wires at the sender conn. and the gauge
should read empty if the sender is the problem, key on.
If not then the signal is not making it to the gauge or the ground is bad.
 

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Discussion Starter #5
I couldn't find but one small ground strap on the pass side. So I made up a ground strap and now the fuel gauge works. Engine still wont start. I cleaned 2 of the cables and ground wire at fuel tank.
 

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Could it be an ignition switch issue?
 

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You may have triggered SECURITY.
What does the SECURITY lamp do when
you are trying to start the truck.
 
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