2004 Fleetwood Discovery 39s. Fuel gauge not working

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my49packard

Member
Joined
May 9, 2014
Posts
14
I wonder if you can help me with me problem on my 24 volt system concerning the fuel gauge and and or sensor.

I have a 2004 Fleetwood Discovery 39s motorhome diesel pusher. I drove to the fuel station, about 10 miles away from our resort, and filled it up 2 weeks ago. The fuel gauge read full after that time.
    I then drove it back to the resort and did not start it up again until yesterday only to find that the fuel gauge was not working.
  It is reading empty, I know that?s incorrect because we have not driven it that far, just 10 miles since fueling it up.

  What I do notice is that when I turn on the ignition the fuel gauge needle does wiggle a little but that?s it.
I am thinking a few things, the gauge could be broken, or the fuel sensor is not working properly, or maybe there is a fuse someplace that's blown. I checked all the fuses on the 24 volt system that I could find and they are ok.
Can you possibly give me any information on this problem?
  My wife and I are going on a road trip in 3 weeks ( on April 15 ) and I want to get this taken care of asap.
Anything you can help me with on this problem I would appreciate it very much.
I am not as educated in the world of electronics as some folks are but I did work as an HVAC tech for almost 40 years and have a fair understanding of wiring schematics and such. Please, if anyone can help me in any way I would appreciate it
very much.  Thank you David A, Packard
 
First of all, it's not a 24 volt system. Nothing in your Discovery or its Freightliner XC chassis runs on 24v (it's all 12v).

The fuel gauge comes with the chassis from Freigtliner, so a call to FCCC Customer Service with your VIN number will get you some tech help specific to your chassis.  1-800-FTL-HELP (1-800-385-4357)

Generally a fuel gauge is either the sending unit (in the tank), a wire from there to the dash area, or the gauge itself in the cluster. A wire is the most common problem, I think.  There may also be an electronic controller for the dash gauge functions that could be at fault. The nice folks at FCCC can advise on that.
 
Thank you Gary,
I looked under the coach at the 90 gallon tank and I think if it's the sending unit that means the tank has to be removed by a service company and then the sending unit replaced. I hope it's not that.
  I will check the wire from the gauge to on the cluster. I would think there would be a reading on the wire if I checked it with a meter.
Thanks for the heads up on my thinking 24 volts instead of 12. I have a lot to learn. I will get back to you and let you know the results of everything. Thanks again for the heads up.  Dave
 
Most common is a bad fuse.  If you are handy, check the ohms reading in the input to the gauge.  Can be the sender, can be the gauge, can be a ground off the gauge. 
 
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