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Old 03-26-2020, 10:00 AM   #1
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Fuel tank capacity

I have a new to me 2017 Winnebago Forza 34T on the Freightliner XCS 26,000 lb chassis. All specs indicate it has a 90 gallon fuel tank. I normally fill when the tank gets to about 3/8 full and only able to put in 40 or so gallons. As a test, on my last fill I ran it down to the red on the gauge and the low fuel light just came on. I could only get 60 gallons in the tank. Do I not have a 90 gallon tank or is the fuel gauge not calibrated very well? What do you think? Thanks!
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Old 03-26-2020, 10:08 AM   #2
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Quote:
Originally Posted by Straatc View Post
I have a new to me 2017 Winnebago Forza 34T on the Freightliner XCS 26,000 lb chassis. All specs indicate it has a 90 gallon fuel tank. I normally fill when the tank gets to about 3/8 full and only able to put in 40 or so gallons. As a test, on my last fill I ran it down to the red on the gauge and the low fuel light just came on. I could only get 60 gallons in the tank. Do I not have a 90 gallon tank or is the fuel gauge not calibrated very well? What do you think? Thanks!
Fuel gauges are notoriously inaccurate and you may have one in your coach. I would double check with the manufacturer as to the volume, and calculate the need to fill by miles traveled, not the gauge. Further, I would rely on the gauge only for the top half of the tank, and look to refuel when the gauge reaches 1/2. BTW, having a gauge error on the side of having more fuel than indicated, is a good thing, if you have a 90 gallon tank.

The numbers you posted are consistent with a tank that holds ~60 gallons.
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Old 03-26-2020, 10:14 AM   #3
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My tank is square-ish. So I measured it. Yep, it can hold 90 gallons, but it never will. The fill necks are positioned so that I think one can only get 85 gallons in there, and the rest is air above the top of the fill neck. If your tank is square-ish and not two pieces of stamped steel seamed together, measure its cubic capacity, LHW. There are 231 cubic inches in a gallon. Then notice what affect your fill neck(s) may be having.


And yes, these fuel gages are notoriously inaccurate. Most of us use miles driven. Over time, you will get a good idea of MPG by doing the math, miles driven over fuel purchased to refill the tank. Use this as your primary fuel gage.
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Old 03-26-2020, 10:15 AM   #4
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As Larry has mentioned ; fuel gauges are notoriously inaccurate ;

90 gal tank would probably only be 80/82 usable and motor homes don't coast very far so , be warned .

Perhaps a call to Freightliner's free help line with your chassis serial number will get you the info on the tank size.
1-800-385-4357
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Old 03-26-2020, 11:09 AM   #5
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Thanks. It is square-ish between the frames and quite certain it is suppose to be 90 gallon. So I am going with the fact the gauge is just off. I agree if it is to be off, it is better to error this way. I never liked running low on fuel or gas where I have to keep one eye on the gauge. I ran out once in a company truck out in the boonies and I swore I would never let that happen again. I think I will just know it can run down to a quarter tank or so and not worry. Thanks again!!
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Old 03-26-2020, 07:38 PM   #6
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Ours is also 90 gallons and the most I've ever been able to get in it was around 66 or 67 gallons, and the low fuel light was on.
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Old 03-26-2020, 08:25 PM   #7
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ours is 100 gallon, i had to run it once past the red line on empty, below the blck line into NO GAUGE area, due to traffic and road closures, made the pucker factor intense. anyway...........


it squeezed in a tad over 90 gallons.


if i fill up at 1/2 tank it takes 40 or so to fill up
1/4 is 65 to 70 ish its not linear by any means. tank orientation,(level or off level) to fill neck makes a difference. so i try to fill up on level ground
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Old 03-26-2020, 08:50 PM   #8
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Our rig holds 140 gal. My warning light goes off with 40 gal left, I have only done this once. We normally start looking for fuel at 1/4 tank (650 miles) since I don't like to run the tanks near the bottom just in case of sediment.
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Old 03-27-2020, 11:01 AM   #9
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I think that Forza is on a FL XCS straight rail chassis with a 90 gallon fuel tank. I had a 2002 Horizon and a 2011 Meridian on the same chassis same length. In both cases the Low Fuel indicator would come on when the gauge was just below 1/4. Generally at that point it would require about 65 gal to fill it. As others have recommended the fuel gauge can be not very reliable so watch miles driven. That MH probably averages just under 9 MPG so I would recommend that at between 600 & 650 miles you should be looking for a place to fuel up. At that point the Low Fuel indicator will have been on for 50-100 miles and the gauge is probably about mid-way between 1/4 and empty. I believe that rational will give you a 10-15 gallon buffer. I have gone to where the gauge needle is on the red low fuel area and have put in ~78 gal.
As a side note, the FL display of gallons used will under estimate fuel usage by about 10%, so the calculated fuel economy will always be better than the actual (calculated by you: miles driven/gallons pumped).

Happy travels,
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