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Old 03-24-2020, 08:36 AM   #1
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How accurate is your fuel gauge?

2017 Ventana Le 4037

I drive on half a tank of fuel for the most part. Rarely I have let the tank go-between half and a quarter of a tank.

Full tank of fuel the gauge shows 7/8's of a tank. The gauge never shows full.

The gauge at 3/4's will fill at18 gallons. At half gauge will fill at 38 gallons. Is this normal?
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Old 03-24-2020, 08:43 AM   #2
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Mine is close, but that's about all you can expect from these rigs. My filler neck location means that the top 2 inches of my tank never gets fuel.
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Old 03-24-2020, 08:53 AM   #3
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I gave up on my gauge. I did try to adjust the Centroid sending unit in the tank, it helped but still not accurate.
Instead I use the Silverleaf VMSPC system which does provide accurate consumption info, probably +95% accurate. If I use the generator I just have to take that into account.
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Old 03-24-2020, 09:15 AM   #4
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I donít usually go by the the gauge I normally stop for fuel after driving 350 miles more or less it coincides with the most I drive in day.

Zzotte
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Old 03-24-2020, 02:24 PM   #5
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Maybe Iím just lucky but mine works. Good thing because the calculation on miles until empty is in left field. Usually about 1/2 reality
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Old 03-24-2020, 02:44 PM   #6
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It amazes me, and I have complained: I have better data on the status of my poop tank, than on my fuel tank. I agree having good data on my black tank is a good thing. Why not on my fuel?
First trip is my diesel, at destination, It said I had enough fuel for a round trip. 175 miles from home, red light flashing on tank level, control center says LOW FUEL Warning, tank needle below the E line. I panic!
Get off at next exit..two stations...both too small to maneuver. Back on Highway sweat blood for 18 miles to Loves.
Carefully fill the tank, enough fuel left for over another 100 miles.
A six figure sophisticated motor home, and thatís the best they can do for an accurate fuel gauge?
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Old 03-24-2020, 04:06 PM   #7
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Fuel Gauge

I guess I'm one of the lucky ones. If my tank is at 1/2, it will take 60 to 80 gallons to fill. I have to fill slowly the last 25 gallons due to diesel foaming and the path of the filler neck.
The first time I filled the tank, the flow stopped and some fuel spit out the filler neck. The gauge read just slightly above 3/4.
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Old 03-24-2020, 04:27 PM   #8
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Quote:
Originally Posted by Robert T View Post
2017 Ventana Le 4037

I drive on half a tank of fuel for the most part. Rarely I have let the tank go-between half and a quarter of a tank.

Full tank of fuel the gauge shows 7/8's of a tank. The gauge never shows full.

The gauge at 3/4's will fill at18 gallons. At half gauge will fill at 38 gallons. Is this normal?
Mine is exactly the same, exactly. I very seldom even look at the fuel gauge anymore. At each fill up I reset the dash odometer and when it hits around 300 miles I am at my approximate refill range. You would think after putting gauges in fuel tanks for over 100 years it would be incredibly simple to have an accurate gauge designed.
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Old 03-24-2020, 05:27 PM   #9
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I agree the gauge is not that accurate but get to know your system and keep track of how much fuel you can take at certain points so you know your remaining fuel. Depending on your views, some will want to know this at 1/4 tank, some at fuel light or some other level. Keep in mind the genset and oasis stop pulling fuel at some level, guessing 1/8 tank.
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Old 03-24-2020, 05:28 PM   #10
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Quote:
Originally Posted by Robert T View Post
2017 Ventana Le 4037

I drive on half a tank of fuel for the most part. Rarely I have let the tank go-between half and a quarter of a tank.

Full tank of fuel the gauge shows 7/8's of a tank. The gauge never shows full.

The gauge at 3/4's will fill at18 gallons. At half gauge will fill at 38 gallons. Is this normal?
My gauge is the same way.
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Old 03-24-2020, 05:58 PM   #11
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2019 DS 4018: Fuel gage is pretty close I have found. About 5 gals off from what it says I burned and what it actually takes to fill. All in all not too bad. At half it may say I have used 48 when in reality its closer to 53.
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Old 03-24-2020, 07:49 PM   #12
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My fuel gauge is really accurate.

At least that's one liquid measuring gauge that works. Thank goodness my 1/2 bath has a gravity toilet right over the black tank so I can see how full that one is.
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Old 03-24-2020, 08:27 PM   #13
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In a Rotary float type gauge typically in most tanks ive seen including mine, is only linear when the float is horizontal, this means from full to 3/4 tank and 1/4 to empty it drops slower than from 3/4 to1/4 tank. This results in the gauge staying longer at full and empty.

i had my son fill the tank 5 gallons at a time While i took pics of the gauge to relate gauge to gallons. At 1/8 on gauge, tank has 30 gallons left from a 90 gallon tank.

Agree to run on top half but i wanted to know just in case.
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Old 03-24-2020, 10:49 PM   #14
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Never rely solely on a fuel gauge.
Keep accurate record at each fuel purchase (fill up) of quantity, odometer reading, and generator hours. After just a few tanks youíll have a good and improving read on your mpg. For accurate mileage calculations, you have to separate out the gen fuel used, leaving you with a ďnet fuel to engineĒ figure.
After this, you can calculate in seconds how much fuel you have left in the tank.
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