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Old 11-12-2012, 12:02 PM   #1
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Fuel guage issues - part 2

Last week I noticed my fuel guage took about 20 minutes to get up to the Full mark after I filled up and drove down the road.
Now today, when I turn on the key and wait for the 'wait to start engine' light to go off - the fuel guage jumps to full and then goes down to 1/4 tank. Then it slowly moves up but never gets to the full mark. I have only driven about 20 miles since the fill up so I know it is full.
So I shut the engine off and turned the key back on and instantly the guage jumps to Full again for a second and then drops to 1/4.
During all this I have the parking brake on and the light that says 'brake' seems to get dim for a second as the fuel guage jumps around a bit.
My wall guage says I am getting 13.5 volts to both the house and chassis batteries. Starting the generator during this makes no difference.
Any ideas?
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Old 11-12-2012, 01:23 PM   #2
"Formerly Diplomat Don"
 
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AtlantaRick....Your symptoms sound like a ground issue. When you first start your coach, especially if it's cold out, your fuel rail heater comes on and draws a LOT of power. It will usually make your voltage gauge jump all over for a minute or two as the heater turns on and off. This with your previous symptoms sounds like your sending unit isn't getting a good ground.

Your coach has a Centroid http://www.centroidproducts.com/moncal.htm sending unit. It's located on top of the tank on the driver's side. The top of the sending unit is about 3" in diameter and has adjustment screws and wires held on by nuts. I would open the bay door (remove screws from under the panel and lift the panel up) and clean the connections. As with most Monaco products, they sprayed undercoating on everything, including the sending unit. Loosen all the nuts, make sure everything is clean and retighten.

If you get everything working, you can also adjust the needle on your fuel gauge to where you want it. There are adjustment screws on the top of the sending unit.

I adjusted my unit when it was new to make the needle on thegauge go to where I wanted it. About four years later, the gauge started doing crazy things, some similar to yours. I called Centroid and they said I should check for algae issues on the interior portion of the sending unit. I knew I didn't have algae issues and decided to adjust the needle one more time before I replaced the sending unit. It has been fine ever since.
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Old 11-12-2012, 02:06 PM   #3
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Thanks Don. I will try to find the unit and make sure it is clean and the connections tight. I don't have a volt meter on the dash - just a push button indicator on the control panel back by the bathroom. It is the fuel guage that alternates back and forth. I doubt it is algae because fuel doesn't stay in the tank that long. Raining here today so will be at least tomorrow before I can check it out. Thanks again for your idea.
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Old 11-12-2012, 06:49 PM   #4
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I had a similar problem, Navistar paid to have a ground wire run directly over to the gauge from the sending unit. Problem solved........deSanford
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Old 12-13-2012, 12:27 PM   #5
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After some emails from Joel, I was about to run a separate wire from the sender ground to the ground on the back of the dash gauge to see if that helped. But first I decided to clean the wires once more. The ground wire on the sender unit was basically clean but had a couple of real tiny dots (like rust) so I used sandpaper and cleaned it off. I reattached the wire and now it works!
I will try the website instructions to recalibrate it the next time I fill up because this summer I ran out of fuel and the low fuel light never came on so it needs to be adjusted to show less in the tank than what it does now.
I will use the odometer as a back up for now until I am comfortable that it is somewhat accurate.
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Old 12-13-2012, 12:53 PM   #6
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Rick.....I knew my tank was rated at 100 gallons, but realistically believe it will deliver about 90 gallons. SInce the gauges aren't accurate, I decided I wanted mine to at least read at the half way mark when I had gone through 45 gallons. I kept a mental note of where it was on the fillups that I took around 42-47 gallons. Mine was about an 1/8" below half. When I adjusted mine, I jsut moved the needle that 1/8". If you set your gauge so that the needle is right at full on a full tank, I'll guaruntee that you'll have less than half of your available fuel when you reach the half way mak on the gauge. Whne I fill up, my gauge goes past full by about a 1/16" - 1/8".

Just keep in mind that you don't need to have a full tank to make the adjustment. Just make a mental note each time you fuel up where the needle was and where it went to.
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