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Old 10-21-2013, 06:47 PM   #1
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Best guess please?

1990 Pace Arrow Fleet Wood 31' bumper to bumper with a 460 gas engine. How many gallon is that gas tank?

Thanks in advance for any input
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Old 10-21-2013, 06:49 PM   #2
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I had a 1990 Pace Arrow / Chevy chassis and it held 75 gallons.

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Old 10-21-2013, 06:55 PM   #3
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If you can measure the dimentions of the tank and figure the cubic inches, there are 231 cubic inches in a US gallon.
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Old 10-21-2013, 07:02 PM   #4
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If you can measure the size of the tank then gallons are easy. Lets say the tank is 60" long and 24" wide and 12" tall then just do the math. 60 x 24 x 12 = 17,280 cubic inches. A gallon of gas takes up 231 cubic inches. 17,280 / 231 = 74.8 gallons. Basically this would be a 75 gallon tank. Good luck.
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Old 10-22-2013, 09:29 AM   #5
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64" x 14" x 27" Is the tank size


It runs out of gas at 45 gallons?
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Old 10-22-2013, 10:29 AM   #6
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That's a 75 gallon tank. Mine is about the same size, works out to about 100 gallons if you just measure the outside (and subtract off a few gallons for the round corners). By design, there's air space at the top when full.

But 45 gallons? What does your gas gauge say when you fill up? On E before and F after?

Could be a venting issue. RV manufacturers are pretty notorious for installed vent lines that have dips in them and get plugged up easy. Worth a look at them.
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Old 10-22-2013, 10:32 AM   #7
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I see the full tube and the vent line follows it out to the back bumper. How would I check a vent problem?

The gas gage use to work a little. Stayed on full for at lease a hundred miles. The dropped like a rock. Now it only seems to stay on full.
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Old 10-22-2013, 10:42 AM   #8
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Ahhh, you must have a VERY long fill and vent line. They enter the tank on the side. The vent line must go uphill smoothly from the tank all the way to the filler neck so any fuel that gets in it (overfill, condensation, vehicle dynamics) drains back to the tank. If the vent line is plugged with liquid, escaping air is forced to use the fill line as the tank fills. This disrupts the pressure wave gas nozzles use and can cause premature shut offs.

You might find that you'd be able to add much more fuel if you fill very slowly, or ignore the shutoffs and keep forcing in fuel. Not that you should have to do that, just that it would demonstrate the issue.

(I'm guessing your vent line looks like a telephone wire hanging between where they attached it to your coach....)
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Old 10-22-2013, 10:48 AM   #9
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I don't have any problem putting the fuel in at full speed.
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Old 10-22-2013, 10:52 AM   #10
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45 gal tank

You might be have a tank equipped with a draw tube for a generator. Usually the draw tube for the generator leaves the bottom portion of the tank so if you are boon docked and use your generator a lot--- you won't drain you tank dry leaving you stranded. So there could be two different ports each hooked to a different draw tube of different depths in the tank. One should be the engine the other for your generator. Could be the engine and the generator hook up is just backwards.

The problem you describe sounds like this could be a possibility.

Hope this helps

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Old 10-22-2013, 10:59 AM   #11
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Good thought! If that was the case then if I run out of gas again, I should see if I can run the generator to test your theory... Loren Rice

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Old 10-23-2013, 01:29 PM   #12
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Originally Posted by homeless View Post
Good thought! If that was the case then if I run out of gas again, I should see if I can run the generator to test your theory... Loren Rice
Yes I thought of that too. If you do run that test remember it will take awhile to empty your fuel line and carb-- so give it a little time.

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Old 10-23-2013, 01:36 PM   #13
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Does it have TBI? If so the pump is in the tank and the fuel line isn't hooked to the generator pickup tube.
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Old 10-23-2013, 02:58 PM   #14
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The simplest explanation is that you are filling it when it is still half full. A fuel guage that dousn't indicate correctly isn't unheard of. Unfortunately, short of running it out of fuel, I can't think of a re4al easy way to check it.

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