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Old 10-28-2007, 11:06 PM   #1
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Today while coming off the interstate, the gauge went from 1/3 to 0 and stayed there until about two minutes after I started moving again. Then it returned t 1/3, and went to 1/8 until I got back to my house (2mi)then went back to 1/3. Previous owner said it happened to him a few times when he was below a 1/4 and he would just cycle key on and off to fix. Have you experienced this?

Thanks, John

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Old 10-28-2007, 11:06 PM   #2
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Today while coming off the interstate, the gauge went from 1/3 to 0 and stayed there until about two minutes after I started moving again. Then it returned t 1/3, and went to 1/8 until I got back to my house (2mi)then went back to 1/3. Previous owner said it happened to him a few times when he was below a 1/4 and he would just cycle key on and off to fix. Have you experienced this?

Thanks, John

04 Journey 32T/300 Cummins/33700 MI
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Old 11-02-2007, 03:28 PM   #3
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John,
We've only had our 1998 Discovery for three weeks so I haven't experienced this but I have seen it on automobiles. The amount of swinging of the gage seemed to depend on the electrical/electronic damping that is built into the sytem, and if it is working to average out the movement of the level indicator in the fuel tank. As you would expect there is a lot of sloshing of fuel in the tank when it is near empty so that's when it would happen.
Good luck! Jody
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Old 11-03-2007, 04:46 AM   #4
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We've had a similar thing happen us. On a trip, we had just dropped to 1/4 tank and where heading for a truck stop that we knew about only 20 miles ahead. Suddenly, the guage when it went to empty and the alarm sounded. Fearing a problem, we exited immediately and I put 20 gallons of VERY EXPENSIVE fuel in at a regular station. When I restarted the engine, the guage on our 90 gallon tank showed almost half full. Here is what I believe.
1. The fuel gauge indication is not linear. We have VMSpc which has a fuel tank minder in it and, with adjustment, proves to be accurate with our fillups within a gallon. When we compare the VMSpc minder, the gauge significantly under reports usage from a full tank (meaning that more fuel is used than registered by the gauge) and significantly over-reports change under 1/2. On ours, the drop from about 3/8 tank to a 1/4 of a tank is very rapid while VMSpc is shows fuel usage in line with our expected mileage.
2. There are baffles in the fuel tank to keep fuel from shifting significantly while cornering and stopping. It can take a period of time for the actual level of the fuel to equalize itself among the baffles and register on the fuel tank sensor. If, for example, you came down a freeway exit ramp which loaded up fuel into the front baffle, equalizing the fuel back to a flat level and then have the sensor respond might take a few seconds. It is possible that your sensor is a bit more delayed than others in doing this.
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Old 11-04-2007, 01:09 AM   #5
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I have a new Country Coach and have over 4,000 miles on it and the fuel gauge has not left full yet, looking at it as a great mileage coach. Bubble will break if they ever get new sending unit in.
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Old 12-12-2007, 04:01 PM   #6
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CHASFM11,

Your explanation makes sense. I know for instance that a ship carrying large amounts of liquid uses baffles to keep center of gravity and thus stability under control. I would assume our 90G tank could possibly have a series of baffles that would in fact cause such adverse reactions. I wonder if any others might have a definitive answer.


Thanks,

JD
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