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Old 04-02-2020, 02:21 PM   #1
jerryo
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on board fuel tanks

keystone carbon 347
fuel tank 30 gal. used all fuel, went to station could only put in 14 gal.
fuel gauge flashing when empty, read full at 14 gal
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Old 04-03-2020, 11:03 AM   #2
bobbecky
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You may get a response to this if it were posted on the toyhauler section. Not too many fifth wheels with a fuel tank.
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Old 04-03-2020, 11:16 AM   #3
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I will move this thread to the toyhauler section. Hopefully the OP will get the responses he's looking for in that section.
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Old 04-03-2020, 11:28 AM   #4
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Not sure what to say on this one. I have a 30 gallon tank as well. The first time I filled it, i was able to get 26 gallons in it. It wasn't completely empty, as the generator was running during my PDI.
I know the gauge will show empty with a fair amount of fuel left in it.
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Old 04-03-2020, 11:40 AM   #5
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The fuel tank is "wide, long and flat"... That configuration, coupled with a float level on one end will make for "significant false readings" if the tank is not perfectly level. Just 1" off level side to side or 2" off level front to rear can make for a quarter tank (or more) error in float position. The fuel tank is really not much different (in shape, capacity or how it reads fluid level) so if the trailer is "parked at an angle at the gas pump" and "connected nose high to the tow vehicle" the level gauge and the nozzle flow to overflow may well be significantly different.

What was the "gauge reading" when the tank was "measured level" ??? and, in that position, how much fuel could be added to get the gauge to read full???
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Old 04-03-2020, 12:58 PM   #6
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Yeah, they hold 30 gallons total between the both of them. A lot of advertising leads you to believe it's 30 each. As someone else stated above. They are long, flat and wide tanks. Deceiving when you look from underneath. And remember, always throw some stabilizer in there. I use seafoam.
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Old 04-03-2020, 01:45 PM   #7
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The fuel tank is "wide, long and flat"... That configuration, coupled with a float level on one end will make for "significant false readings" if the tank is not perfectly level. Just 1" off level side to side or 2" off level front to rear can make for a quarter tank (or more) error in float position. The fuel tank is really not much different (in shape, capacity or how it reads fluid level) so if the trailer is "parked at an angle at the gas pump" and "connected nose high to the tow vehicle" the level gauge and the nozzle flow to overflow may well be significantly different.

What was the "gauge reading" when the tank was "measured level" ??? and, in that position, how much fuel could be added to get the gauge to read full???
have single filler neck setting level at filling station
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Old 04-03-2020, 01:49 PM   #8
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have single filler neck setting level at filling station
back flow shut off pump, tried slower flow from pump no more space in tank
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Old 04-03-2020, 02:21 PM   #9
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The information above that they ae 30 total between them is not accurate. If generator equipped, they are 30 gallons each in theory, measuring length times width times length. In actuality, remembering that the pickup tube seldom reaches the bottom, your mileage may vary. Measure them for yourself and then remember to fill them with the filler neck as the highest point, maybe requiring a 2x8 or two under the tires during filling.
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Old 04-03-2020, 02:21 PM   #10
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back flow shut off pump, tried slower flow from pump no more space in tank
I don't know if this is you're issue, or if this will help but I'll relay my experience. When dealing with shallow long tanks sometimes it will fill easier if you stop filling, let it "settle" for 15 or 20 seconds, then resume "topping it off".

Years ago I had a 17" bow rider with an outboard motor and what they called a "lay flat" tank. It was permanently installed with a deck fill and I think a 3/8" vent. It was a PIA to fill. After a while I became used to when to stop and when to resume the flow into the tank. It had a fuel gauge in the dash that looked like a weathervane in a tornado every time the boat moved.

Hope this helps.
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Old 04-03-2020, 02:25 PM   #11
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The information above that they ae 30 total between them is not accurate. They are 30 gallons each in theory, measuring length times width times length. In actuality, remembering that the pickup tube seldom reaches the bottom, your mileage may vary. Measure them for yourself and then remember to fill them with the filler neck as the highest point, maybe requiring a 2x8 or two under the tires during filling.
Hmmm, not on our 417. 3 5 gallon jugs is all she'll take per tank. Seperate fillers. I would assume the fill hose is on the end of the tank too, not into the top. Which would not allow a complete full tank perhaps.


Other brands/models could be different of course. But 60 gallons of fuel is a lot of weight, and fuel for that matter hehe
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Old 04-03-2020, 02:46 PM   #12
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My 361LEV book says it has a 30 gal tank, the sticker on the side of the tank says 30 gals. but will only take 15-17 gals. at fill up.

It has only one filler and one tank.
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Old 04-03-2020, 03:22 PM   #13
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I’m not sure if I have ever got a full 30 in either but definitely have put north of 50 in between the two for a long boondocking weekend. My gen gauge is pretty accurate but the aux tank reads low typically. If there is any negative slope it will not fill fully and will splash back
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Old 04-04-2020, 01:09 PM   #14
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Yeah, they hold 30 gallons total between the both of them. A lot of advertising leads you to believe it's 30 each. As someone else stated above. They are long, flat and wide tanks. Deceiving when you look from underneath. And remember, always throw some stabilizer in there. I use seafoam.
Sweeping generalization is not true. Not a sales gimmick - our spec sheet lists two 30 gallon fuel tanks (generator & auxiliary). If you are having problems, I suspect you are attempting to fill them when not level. Our 2018 Raptor 353TS has two 30 gal tanks, each with its own fill neck. I have put at least 28 in each tank (total of 56). At home, after performing an "auto-level", I have no problems topping these tanks to "nearly" full with 28-29 gallons. Our unit would then leak fuel once taken off level. We replaced the cheap OE fill caps with good Stant locking caps and have had no other issues.

Hope that helps.
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Old 04-04-2020, 04:48 PM   #15
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Mine are differentially only 15 each. Even says in the brochure. And I'm ok with that. I'm pretty anal about level. I'll be damned if my trailer is out even when hitched ��
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Old 04-05-2020, 02:10 AM   #16
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Greg, I cropped this from a screenshot of your spec's page and now see where your info came from. However if you look at gallons and weight then you'll really be confused.
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Old 04-05-2020, 05:56 AM   #17
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Interesting...on a Raptor, the "auxiliary" tank is the tank that feeds the fuel station. This would be in addition to the main tank that feeds the generator.

I've PM'd the OP to make sure he knows I'm not trying to be argumentative on this subject. As a toy hauler owner, I know how important fuel capacity can be when boondocking camping. I really hate to see someone give up 50% of their capacity so I'm encouraging him to continue his research on this topic. Here's why:

I too looked at and then downloaded the 2018 Fuzion brochure from the Keystone web site. [I had to split it into 3 files due to the attachment file size restriction (2 MB) for this forum. I have attached all 3 segments of this file to this message so that you can see my source of confusion.]

On the first page of the 3 of 3 file, under Equipment Standard/Garage, it lists "Fuel Station with 12V pump, dual 30 gallon fuel tanks, and static line".

A 15 gallon tank would only require 4 cu ft of storage. This would take a tank 2' X 4' x 3" and would be nearly unusable when not completely level. The 2 tanks under my 2018 Raptor are roughly 2' X 4' X 6" each. That's 4 cu ft or 30 gallons. I would really encourage you to crawl under you garage and make a general measurement of your two fuel tanks. Then use 7.48 gallons per cubic foot and see if you can verify the size.

I hope you can work this out! 30 gallons of missing fuel translates into a lot of days of fun with your toys!
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File Type: pdf fuzion_brochure_jan2018lr3of3.pdf (1.13 MB, 134 views)
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Old 04-05-2020, 06:03 AM   #18
Big 417
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Greg, I cropped this from a screenshot of your spec's page and now see where your info came from. However if you look at gallons and weight then you'll really be confused.
Yeah, I looked at those specs yesterday too. Should be around 180# based on 6# per gallon.

Specs, maybe doesn't mean specifications. Maybe it stands for speculation lol
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Old 04-05-2020, 06:11 AM   #19
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Yeah, I looked at those specs yesterday too. Should be around 180# based on 6# per gallon.

Specs, maybe doesn't mean specifications. Maybe it stands for speculation lol
I thought Specs was a nickname for the old guy that types these things up, you know, the guy who's glasses are always so dirty he can't recognize his own face in a mirror.
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Old 04-05-2020, 09:35 AM   #20
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Ok, so this was driving me crazy lol. Went outside and crawled under the trailer. Took a bit to slide down the snow bank under the darn thing lol.

And I stand corrected, so does the spec sheet.

Each tank measures 6"*19"*60". Which gives 6840 cubic inches. So @231 cubic inches a gallon, that's just over 29 gallons. Close enough to say 30. The filler neck enters the top of the tank.

I must admit, I haven't filled an empty tank at the pumps, just here and there with Jerry cans. To the point of overflowing. I based my initial numbers on what I've pumped out, and that has been way less than 30 gallons before the pump ran dry.

So that's makes me question if the transfer pump pickup is reaching the bottom as it should.
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