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Old 12-31-2015, 01:08 PM   #1
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Swap 30# LP Tanks for 40#

Has anyone run into any issue with swapping the 30# LP tanks with 40#s? Are the 40#'s the same diameter and do any pigtails need to be replaced?
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Old 12-31-2015, 01:19 PM   #2
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40s are the same diameter, just taller and heaver when filled.
For me, replacing the 30s after filling are plenty heavy, would love the larger capacity of the 40s but do not want to deal with the extra weight of the 40s when replacing the tanks after filling.
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Old 12-31-2015, 01:56 PM   #3
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A few on here have done the swap, and I remember something about pigtails. If mine was close by I would give you a measurement on the pigtails for our 40s, but its far away in storage.
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Old 12-31-2015, 02:31 PM   #4
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I swapped mine out to 40's and everthing fit, pigtails were long enough to reach
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Old 01-01-2016, 03:05 PM   #5
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When we ordered our 2012 RL I didn't order the 40 Pounders, but swapped the 40's from our trade into the RW with no issues.
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Old 01-02-2016, 05:00 AM   #6
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Like the others that have switched there is nothing to do but put them in and hook up with the same fittings. They are a little heavier if that is a concern lifting them up.


I went with the 40 lbs in case I have to use my onboard generator for a long period of time. I think 2 forty lb bottles give you about 34 hours of running time.
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Old 01-02-2016, 10:05 AM   #7
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Thanks to all......I had the Onan 5500 LP Generator installed and it seems to use the LP up pretty fast. I traded my Fuzion 5th wheel which had two 30 gallon gas tanks to use with one dedicated to the onboard 5500 gas Genset which seemed to last forever.
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Old 01-02-2016, 03:29 PM   #8
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It's just a perception really, the two 30 lb LP tanks are 14 gal of fuel and it's not dedicated like your 30 gal gas tank was, as depending on how you are set up the LP fuels the fridge, furnace, range, and hot water.

Fuel consumption for LP is higher than gasoline, but not by far on the 5500 -

full load gas - 1.1 gal/hr
full load LP - 0.9 gal/hr

half load gas - 0.8 gal/hr
half load LP - 0.6 gal/hr
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Old 01-02-2016, 06:58 PM   #9
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Brad ,
Going by your post , if I were to add a genny and run it off my 30# tanks... I SHOULD ONLY get about 28 hrs total running at full load?
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Old 01-02-2016, 07:44 PM   #10
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First let me clarify I entered the data wrong - I reversed the LP and gas consumption when I typed: (LP is less efficient) I attached the spec

full load LP - 1.1 gal/hr
full load gas - 0.9 gal/hr

half load LP - 0.8 gal/hr
half load gas - 0.6 gal/hr

But in regard to your question - you would actually be closer to 13 hrs at full load. With both 30# tanks at 7 gal (14 total), at 1.1 gal/hr, assuming nothing else using LP, you would be toast at about 12.72 hrs. At half load, 17.5 hrs, which is probably closer to actual pull on a 5500 even with two ACs. With my 40# (9.5 gal each or 19 gal), the best I can hope for is 23.75 at half load.

Now the paradigm - When boondocking with the Onan operating, is it more LP fuel efficient to operate the HW, fridge, furnace, cooktop on LP, or electric? Or any combination? It would be an interesting workup. I would assume furnace and fridge on gas and limit generator use to charging the 12v only, but I don't know.

By far, the most efficient generator is the ECU gas generators that idle down.
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File Type: pdf a-1425.pdf (290.4 KB, 14 views)
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