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Old 12-28-2011, 09:13 AM   #1
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Fuel gauge accuracy on Entegra Aspire

On our maiden voyage down to Florida last week with our new 2012 Aspire 40DRQ I noticed the low fuel light came on at about 1/8 tank indicated. When I filled up the tank, I was only able to get 67 gallons in. That 33 gallon discrepency seems fairly extreme compared to the low fuel light and the 1/8 reading. Since this is our first DP, any thoughts on how reliable fuel gauges tend to be? Our Dolphin 5355 gauge was also pretty inaccurate. With 75 gallon capacity I would never be able to get more than 50 gallons into the tank even when the gauge registered 1/8.

Within reason I'd sure love to drive a further 100 miles before filling up. It would seem safe to take her down to 15-20 gallons, but it's a bit of a concern when the fuel gauge is apparently inaccurate.
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Old 12-28-2011, 10:26 AM   #2
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I dont recall mine being off that much, but I never took it down to the low fuel light. Its going on a long trip this weekend so I will post its accuracy when I get back.
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Old 12-28-2011, 11:46 AM   #3
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Thanks. I will be curious to see what you find. We will be finalizing our punch list for the coach in the coming days. Maybe this will need to be added. So far our punch list is the little nuisance stuff. All major components seem to be ok.
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Old 12-28-2011, 09:28 PM   #4
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mine is off quite a bit also, when it says empty it still has about 30 gallons left in the tank.
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Old 12-29-2011, 07:30 AM   #5
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Our Spartan chassis'd Allegro Bus is the same. Part of the reason is that the fuel tank sending unit operates on an arm that swings through an arc as the fuel level varies. Near the very top it hardly moves and near the bottom it reads low because the resistor is most accurate around the half-tank level. The other half is that the sending units are calibrated to give you a good scare before actually running out. That way you don't get into trouble by running it empty and they also don't like you sucking the sediment or water off the bottom of the tank and plugging the filter.

However, some can be really off, most likely from bending the arm when installing the unit into the tank.
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Old 12-29-2011, 07:55 AM   #6
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Thanks for the information Cruzer. Given the propensity of the inaccurate fuel gauges do you tend to run longer until you fill up or just play it safe? I will be taking the coach to Entegra in January for our punch list fixes, so I will have them verify if the arm was bent (of they can do that on a finished coach).
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Old 12-29-2011, 08:03 AM   #7
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I pretty much preplan my stops and try to target 1/4 tank on the gauge. However, ther's times when that doesn't work out and I resort to my Silverleaf VMS-240CL to get accurate measurements when traveling and some cases I've had to go to "30 miles to empty" a couple of times.

I really don't want to make Leann get out and push if I run out of fuel.
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Old 12-29-2011, 08:48 AM   #8
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I have a 07 winn Tour on a Freightliner chasis. I have also had the same problem. When I bought it the light was on and it only took 65 gallons. I fussed with it for about a year and finally replaced the sending unit. That is not an easy task. I had purposely run it low to lessen the weight and I measured the fuel when I had the sender out. I still had approx 35 gallons. My new sender is almost the same. I didn't gain anything. I am planning a trip to Alaska next year and it would sure be nice to know how much fuel I have rather than a "guestimate".
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Old 12-29-2011, 09:33 AM   #9
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For accurate information try the Silverleaf products. Either the in-dash mounted (I love my VMS-240CL) or the PC version. I believe that RVupgrades.com handles them.
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Old 12-29-2011, 12:11 PM   #10
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My freightliner chassis can display all the information on the display screen that the Silverleaf product provides, and it came with the coach.

It shows me fuel used, MPG, and a lot of other information. Do Spartan chassis not have this? I trust this more than the gauge.
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Old 12-29-2011, 12:33 PM   #11
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Our '07 Spartan does, as do the newer ones. It's just that the Silverleaf gives you more info as well as tracking history. The only problem I've had with the OEM display is that when it gets too low it won't display how many "miles untill empty". After a certain point the display changes to a "Low Fuel" display so you need to do all of your "how far can I go" math in your head before it gets that far.
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Old 12-29-2011, 12:56 PM   #12
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I have plans to throw a 2nd fuel tank in one of the cargo bays. If I ever get to the point where I have to see how many miles till empty, then I screwed up real bad.
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Old 12-31-2011, 04:30 PM   #13
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Just checked things out on a 350 mile drive. At 22.5 gallons used as indicated by the freightliner display, the gas gauge was at 3/4. when the gas gauge was at half, the computer indicated 44.5 gallons used. Thats close enough for me. When I get back, I will compare the display with hou much fuel it takes to fill.
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Old 01-02-2012, 07:41 AM   #14
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I took it down to the low fuel indicator. It came on right as the needle touched the 1/8th mark. I had about 22 gallons left in the tank.
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