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What is the reasoning for 2-fuel tanks on a rv? #5214658 09/16/19 07:54 PM
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RazorsEdge Offline OP
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A friend if mine has a older RV with 2-fuel tanks.
Anyone know the reasoning behind this?


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1987 Mustang GT
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Re: What is the reasoning for 2-fuel tanks on a rv? [Re: RazorsEdge] #5214661 09/16/19 07:57 PM
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So you can drive further between gas stations.


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Re: What is the reasoning for 2-fuel tanks on a rv? [Re: RazorsEdge] #5214662 09/16/19 07:57 PM
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Longer range? My truck has two fuel tanks.


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Re: What is the reasoning for 2-fuel tanks on a rv? [Re: RazorsEdge] #5214669 09/16/19 08:03 PM
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When you look underneath you'll see one take has a fuel pump, the other doesn't so I'm assuming there is some sort of a switch to switch between the two tanks?

Last edited by RazorsEdge; 09/16/19 08:04 PM.

2015 Ford Escape Ecoboost 1.6
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1987 Mustang GT
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Re: What is the reasoning for 2-fuel tanks on a rv? [Re: RazorsEdge] #5214674 09/16/19 08:08 PM
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4 mpg most likely.


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Re: What is the reasoning for 2-fuel tanks on a rv? [Re: RazorsEdge] #5214693 09/16/19 08:28 PM
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oldhp Offline
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Premium in one tank for hills.....................


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Re: What is the reasoning for 2-fuel tanks on a rv? [Re: RazorsEdge] #5214702 09/16/19 08:36 PM
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Balancing the weight?


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Re: What is the reasoning for 2-fuel tanks on a rv? [Re: RazorsEdge] #5214704 09/16/19 08:37 PM
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Design limitations? Easier to build around two smaller tanks vs 1 large one?

Re: What is the reasoning for 2-fuel tanks on a rv? [Re: RazorsEdge] #5214743 09/16/19 09:24 PM
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It is cheaper and easier to add a tank, then it is to replace the OEM tank with a larger tank.


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Re: What is the reasoning for 2-fuel tanks on a rv? [Re: RazorsEdge] #5214765 09/16/19 09:48 PM
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I don't know how true it is, but I was told that my diesel class C (see sig) is odd for having dual tanks. It has a third tank for gasoline, which IS uncommon, I think. Rather than equip it with an LP generator, they put a gasoline one with it's own fuel tank and fuel level gauge. I only use the 18 gallon front tank right now. It gets 9ish hwy mpg so that's fine for me. I like to take a break after 100 miles or so anyway.


1985 Ford E-350 27ft Class C RV (6.9L IDI w/ ATS 085 Turbo, C6 A/T, Dana 70 4.10) MPG @ Fuelly
Re: What is the reasoning for 2-fuel tanks on a rv? [Re: RazorsEdge] #5214768 09/16/19 09:52 PM
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because gasoline rigs share the fuel with the genset its so they can have some actual range or dry camping staying power.

UD


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Re: What is the reasoning for 2-fuel tanks on a rv? [Re: UncleDave] #5214778 09/16/19 10:09 PM
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Cubey Offline
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Originally Posted by UncleDave
because gasoline rigs share the fuel with the genset its so they can have some actual range or dry camping staying power.

UD


I had a 78 Dodge 1 ton van chassis Class B (SRW) motorhone with a factory single 36 gallon gas tank. I had to rebuild the impossible to find fuel sending unit and hand cut a new cork gasket for it. It fed the generator too but only to a certain point in the tank, so the generator would run dry without emptying the tank. That tiny 19ft short class b got 9 bloody mpg and I had it when gas was $4. Yeah, ouch.

I get about 9 mpg hwy in my current big 27' class C diesel with a 4.10 rear. The Dodge had 3.55. I'd probably get 10.5mpg if I had a 3.55 in the C...


1985 Ford E-350 27ft Class C RV (6.9L IDI w/ ATS 085 Turbo, C6 A/T, Dana 70 4.10) MPG @ Fuelly
Re: What is the reasoning for 2-fuel tanks on a rv? [Re: Cubey] #5214786 09/16/19 10:29 PM
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Originally Posted by Cubey
Originally Posted by UncleDave
because gasoline rigs share the fuel with the genset its so they can have some actual range or dry camping staying power.

UD


I had a 78 Dodge 1 ton van chassis Class B (SRW) motorhone with a factory single 36 gallon gas tank. I had to rebuild the impossible to find fuel sending unit and hand cut a new cork gasket for it. It fed the generator too but only to a certain point in the tank, so the generator would run dry without emptying the tank. That tiny 19ft short class b got 9 bloody mpg and I had it when gas was $4. Yeah, ouch.

I get about 9 mpg hwy in my current big 27' class C diesel with a 4.10 rear. The Dodge had 3.55. I'd probably get 10.5mpg if I had a 3.55 in the C...


The genset feeds are purposefully set short in the tank so you dont inadvertently get yourself in a situation where you cant drive out of a dry camp where you are under a heavy load like an AC unit running 24/7.

This can be super annoying if you aren't level which can reduce run time even further.

UD


Uncle Dave
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Re: What is the reasoning for 2-fuel tanks on a rv? [Re: RazorsEdge] #5214788 09/16/19 10:37 PM
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Until the mid 90's, dual tanks were the norm on pickup trucks. Not very unusual for RVs to have them also! Both guzzle gas so it makes sense to have one for backup.

My old first generation Bronco has them as well, it's nice since the fuel gauge doesn't work, when one runs out, just switch over and carry on! Handy as heck.


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Re: What is the reasoning for 2-fuel tanks on a rv? [Re: RazorsEdge] #5214801 09/16/19 11:16 PM
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As has been said, low MPG of the vehicle and the genset adding to the fuel load, requires the need for more fuel storage for longer distances and "parked" ability while running a genset. Even with all that, it isn't a bad idea to carry an extra 5 to 10 gallons at all times.


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