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Old 04-10-2017, 10:21 AM   #1
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150 gallon fuel tank actual capacity?

I am interested in knowing an approximate (max) cruising range for my coach. I have a mpg number (7.3) based on 2 years & about 15K miles. However I really don't know how many gallons are actually in the tank after a garden variety fill up. My thoughts are the 150 gallon tank that Freightliner uses in my XCR chassis probably has an actual usable of something less than 150 gallons. However is it actually rated to fill to 140?, 130?, 120? If anyone has any knowledge on this I would like to know. Thanks!
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Old 04-10-2017, 10:52 AM   #2
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If you can't find the info in the manuals then you may try asking Freightliner and reference the VIN. My coach has a 150 gallon tank of which 148 gallons are supposedly useable and I've adopted the general practice of filling up when there're about 50 gallons remaining. This gives me a healthy reserve if I want to continue on beyond that point to get a better fuel price and not stress about running low on fuel. My resulting range is around 700 miles which is way more than I want to drive in any given day and I can choose a fuel stop based on convenience, schedule, station access, fuel price, etc. Also, if we did have the misfortune of breaking down somewhere I would want plenty of fuel to run the generator and fuel to continue on once repairs have been made. I also travel with my 130 gallon fresh water tank full upon departure for the same reasons. For me, the weight penalty is worth the peace of mind and truthfully I can't tell the difference in performance or handling anyways. All that being said, that's just my "technique" and individual results and opinions will vary.
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Old 04-10-2017, 11:19 AM   #3
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I've never run out of fuel, nor do I plan to. My understanding is that I have 148 gals. available. I rarely let my gauge go under 1/3. Remember under 1/4 tank you can't rely on your generator running.
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Old 04-10-2017, 11:31 AM   #4
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I have a 100 gallon tank and my personal max is 500 miles. Typically, we don't drive more than 300-350 miles a day on a long trip. I always fill at the end of the day so I'm ready in the am.

I wouldn't push yours past 750-800 miles.
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Old 04-10-2017, 11:51 AM   #5
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Refilling at 1/3 is a good idea as others stated. You just never know when you might break down.
I was nearing my refuel point 2 years ago when we had a break down. Not only was I near the 1/3-1/4 tank but the breakdown was a fuel line so I lost even more fuel.
Being a Friday night we were stuck at a rest stop for the evening. Next morning I was towed to service center which did not open till Monday. This left me camping out there till Monday conserving fuel since I felt like it might hit the 1/4 tank mark and no more generator.
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Old 04-10-2017, 12:15 PM   #6
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Well only thing I can tell you is my 190 gallon tank I put 168 gallon in it.
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Old 04-10-2017, 12:17 PM   #7
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the filler necks and vents are attached to the side of the tank, with some clearance from the top, so 148G capacity is impossible. When I have complained about the fuel gage linearity of my 2015 DS in Gaffney, I was told that the yank will hold about 130 G when full, 21G when the low fuel light comes on and the gage shows empty, which explains why I could fill only about 80G when the game shows 1/4 full.
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Old 04-10-2017, 01:19 PM   #8
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Not sure if the average person knows how much diesel fuel foams as you pump it. I have some equipment that I fill with gerry cans. When you try to fill the cans, you can only get about less than 3\4 full. You then have to wait for the foam to settle down and then slowly fill the remaining 1\4. Im sure when the pump clicks off when you fill your mh, it is because the foam has clicked off the pump. If you wait 20 seconds then pump slowly I bet you can get quite a bit more in. I have a gas coach so I cant try it. Cheers
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Old 04-10-2017, 01:58 PM   #9
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A related question is at what point does the generator stop and at what point does the oasis diesel burner stop? Anyone know?
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Old 04-10-2017, 05:21 PM   #10
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A related question is at what point does the generator stop and at what point does the oasis diesel burner stop? Anyone know?
The generator will stop at 1/4 tank as the generator fill hose goes down 3/4 of the way.

The Oasis will run until you are totally out of fuel. At least that is what the guy told us during our delivery inspection.

While we are talking about fuel, no matter what I do I always get spillover. Even using the nozzle manually it doesn't ever shut off without spilling. Ideas?
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Old 04-11-2017, 06:29 AM   #11
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When I picked up the coach at teh dealer, I didn't check the fuel guage. The dealer was 100 miles from my house. About 20 miles from home, the low fuel light went on. I got home and the next day went to get fuel. It took 120 gallons. So, I had somewhere around 30 gallons left when the light went on.
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Old 04-11-2017, 06:37 AM   #12
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Originally Posted by RMD3819 View Post
The generator will stop at 1/4 tank as the generator fill hose goes down 3/4 of the way.

The Oasis will run until you are totally out of fuel. At least that is what the guy told us during our delivery inspection.

While we are talking about fuel, no matter what I do I always get spillover. Even using the nozzle manually it doesn't ever shut off without spilling. Ideas?
Have the same frustration on spillover, not a 100 percent solution, but if I put my ear down by the fill tube and hear Gulp/Burp, for lack of a better term, and quickly release I win the battle. My issue is I'm always concerned I wont hear the sound and then have fuel splash on me.
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Old 04-11-2017, 06:56 AM   #13
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I have same problem on spillover. Happens everytime unless I purposely underfill.
Based on the dash gage I have a pretty good idea of how much fuel will be required. Will run it fast till close then slow it down but still get some spill.
I also added a small stainless trim piece that diverts the spillalge to the ground and not down the side of the coach. This helps but at times I still get some on the side.
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Old 04-11-2017, 07:07 AM   #14
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As I stated, diesel fuel foams really badly. This is what causes the spill over. Slow down on the top portion of the tank and let the foam settle down.
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