[Little]

We have the 2 tank setup on our '86. Anyone know offhand what they hold? Owners manual doesn't have the capacities. Thanks,Mark

[77newell]

I had to measure mine in the two Newells I've owned and the then convert cubic inches to gallons. I assumed that I would only fill to 3 inches from the top and that the tanks were 1/4" steel.

Newell made tanks per owners requests so there was no size consistency even within a model year.

[Fulltiming]

You will really need to measure the tanks to determine the actual capacity. I have seen 1986-1987 Newells that claimed a total fuel capacity of 306 gallons, 300 gallons, 200 gallons and 292 gallons.

On my 1992 with twin fuel tanks measure
Main Tank: 26-1/4" H, 23" W and 93" deep external measurement for 243 gallons
Aux/Generator Tank: 27" H, 12" W and 61" deep external measurement for 85 gallons

Calculation (measurements in inches) is (HxWxD) x 0.004329 gallons per cubic inch = gallons

Technically each dimension should be reduced by 1/4" assuming 1/8" steel used to construct the tank. On the Newell floorplan, they show 243 and 85 gallons for those dimensions.

[Keith Jordan]

another way to calculate. length x width divided by 231= gallons per inch of tank height. example(96"x 24"=2304 divided by 231=9.97 gallons per inch of tank height.so a tank 24" in height would be 24x 9.97=239.28 gallons.

[Little]

I actually did the measure and calculate and came up with 230 main and 68 aux., but I thought my calculations were off as I had less than 1/4 tank in Kalispell and it only took 115 gal. So the gauge is goofy.
Our main tank is 26x23x95 and aux is 27x10x61. Fill to 3" from top. Anyway thanks for the help, Mark

[ccjohnson]

1 cubic foot = 7.4805 US gal.

[Tf175]

I actually did the measure and calculate and came up with 230 main and 68 aux., but I thought  my calculations were off as I had less than 1/4 tank in Kalispell and it only took 115 gal.  So the gauge is goofy.
Our main tank is 26x23x95 and aux is 27x10x61. Fill to 3" from top. Anyway thanks for the help, Mark

Sounds like a gauge thing , as you say . According to the book on our 86 , standard equipment fuel capacity was 203 /55 . The build sheet shows 217 /61 . There are two fuel gauges on the coach . I filled up for the first time,  with the tanks linked , held 126 gal. The gauges were indicating a tick over half before filling . After 675 miles the gauges are at roughly 5/8 . While I do not trust them , it seems that the gauges may be in the ball park based on 5.5mpg . Will know more when I refill in a couple of weeks. 
Are you pulling your stacker with the coach ?
Chris

[Little]

Wasn't pulling trailer. If my figures are correct the bus got near 7 mpg over 2200 mile trip. Probably 25 hr. gen time included.

Only issue left to address is the 24 volt conversion. Someone has converted the most of the system to 24v leaving the house at 12v. Problem being the house 12 is not charging from the engine alt. Charges from shore and gen only. May be the same person who put the steering pump together backward.
Took awhile to figure that out. Works great. now.

Filled with fuel this am. Kalispell to Cranbrook to home. 788 miles. 113 gal US. I would suspect the trailer will bring that down 15% Old girl runs like a champ.

[77newell]

I believe there are dc-to-dc converters that can help with you mixed voltage problem. These devices are critical to the move to 48vdc alternators and batteries while allowing use of standard 12vdc stuff.

[wepaddle4]

I have a 200 main and 55 auxiliary.
Is your tank set up for a sight glass?  
I have a sight glass with clear tubing on the main and have a ruler fastened to the tank, I marked 25 gallon increments after doing the math.
My dash gauge is reasonably close but I know exactly how much is in there when I’m at the pump.

Scott