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Old 05-24-2018, 10:34 AM   #1
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Usable fuel capacity question.

I know the fuel gauge can be useless on some of these coaches.
I have seen 110 and 118 listed as the fuel tank capacity. can anyone give me an idea if you have run yours low how much usable fuel in these units?

I understand the Generator will run out at about 1/4 tank. i have never allowed it to go that low since we run the gen all weekend at the track.

I pretty much know my mileage to calculate how much i have used just not sure what the tank capacity is.. I always try to fill before we get to the track on a long trip since i don't want the Gen to shut down.
thanks in advance.
RK
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Old 05-24-2018, 11:19 AM   #2
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My fuel gauge has been fubar for years. I found out coming north that my gen quits when my vmspc shows 1/3 left I have put in 100 gal in a 2003 dynasty 42' regal. I try to find inexpensive fuel at 1/2 I get over 7.5 ave and that would come out close to 700 miles. I never go more than 500 to fuel stops. I ran out at the fuel pump at flying j one time and never never again.
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Old 05-24-2018, 11:30 AM   #3
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According to Monaco the 34', 36', 38' & 40' Dynasty models have 118 gallon fuel tanks


I would NEVER run one below 100 gallons.
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Old 05-24-2018, 11:32 AM   #4
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Just as a rough guestimate you can figure about 8 gallons unusable due to height of pickup and slope of tank. I put 92 gallons in a hundred gallon tank ONCE.
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Old 05-24-2018, 11:45 AM   #5
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Mine Monaco says has a 200 gallon tank. 170 gallons is the most I've been able to put in it. I don't like to let mine get under 75 gallons. If I find diesel under $3.00 on vacation come July, I might try lowering the left side to see if I can put more in it.
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Old 05-24-2018, 01:35 PM   #6
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I put 120 gallons in my 04 Dynasty 42...was told it had a 150. I was in site of the exit I was going to stop at when it ran out. With it leaning to the right I was able to restart.

The bottom of the fill tubes are lower than the top of the tank so I now lean to the right and put another 15-20 gallons in. Leaning to the left makes it burp fuel before it’s full.
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Old 05-24-2018, 02:07 PM   #7
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2005 HR SCEPTER holds 130 gals. Generator shut down with 50 gals remaining, try to fill up 1/2 tank , avg 8.5
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Old 05-24-2018, 04:48 PM   #8
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Mine has a 130 gallon tank and only 100 usable. Don't ask me how I know.
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Old 05-24-2018, 07:37 PM   #9
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My tank holds 130 gal or 500 ltr and my manual said 35 gallons is unusable. I wasn't
willing to carry that much fuel that I couldn't use so I pulled my tank built a sump and put
the new pickup tube 1/2 an inch below the bottom of the tank. Last year year I drove
900 miles and filled up - 105 gallon and had usable fuel left. Before I lengthened the
pickup tube the old one was about six inches from the bottom of the tank
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Old 05-25-2018, 11:31 AM   #10
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Quote:
Originally Posted by MTK46 View Post
Mine Monaco says has a 200 gallon tank.
Mike, was the 200 gallon tank an option?
The 2002 Signature brochure says it has 150 gallon capacity.
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Old 05-25-2018, 11:41 AM   #11
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our dip has 100 gal tank and I have gone done to 75 gal used on the display and it took about that much to fill up !


oh, and when you say lean to left, lean to right, can you let us know your orientation lean to passenger or lean to driver is a clearer description for us weirdo's !


i can't fill mine up and park it on a slope leaning toward the passenger side or it will 'ooze' diesel out the overflow...

took a lot of work to get the grass to grow back in our front bar ditch !
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Old 05-25-2018, 12:01 PM   #12
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Quote:
Originally Posted by vito.a View Post
Mike, was the 200 gallon tank an option?
The 2002 Signature brochure says it has 150 gallon capacity.
Have no idea as I bought mine used. As I can get 170 gallons and there is still room above the fill I would say 200 gallons is correct.
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Old 05-25-2018, 12:34 PM   #13
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I start looking for good prices when the fuel gauge needle is around the half mark and always make it a point to fill when it's above 1/4. My gauge reads more accurately, by the way, since I replaced the fuel sender. Centroid makes the senders for many Monacos: CENTROID PRODUCTS - Computerized Tank Display - Electronic Senders - capacitive fuel gauges

Brochures for most Monaco products from 1990 on are here: https://www.monacocoach.com/luxury-rv-brochures
These should have fuel tank size and other useful info.
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Old 05-25-2018, 04:47 PM   #14
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Fuel gauge on mine only worked till it was out of warranty. Even then it was intermittent. When we fill the tank we open a new trip on the Aladdin display. Then stop for fuel when we've used between 60 and 80 gals. Tank capacity is listed as 120 gal. I did run it out of fuel once about 10 yards from the fuel pumps at a truck stop. Attendant came out and put 5 gal in for me. Filling from the high side I was able to get 100 gal in it. The fill tube is on the side which gives a bit of head space in the tank. I will never run more than 80 gal out due to the fact that the coach leans when being fueled and if there isn't a slave pump I can't cram it full. Also if I know that cheaper fuel is ahead I'll add just enough to get us to a lower price fuel.
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