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Old 07-05-2020, 01:19 PM   #1
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Underbody auxiliary Diesel Tank for Heater

2008 E350 Extended- Has anyone ever mounted a small (5 gallon)auxiliary diesel tank under the body between the spare tire and rear axle? I already have a diesel heater. It seems like there is plenty of room but I'm not sure about fill neck, etc. I don't want to reinvent the wheel if someone has already worked out an elegant solution. Thanks

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Old 09-16-2020, 04:35 PM   #2
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There exist Gasoline Fired heaters.

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Old 09-17-2020, 09:36 AM   #3
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LSretired1 - Do you have a rear box on an Aluminess bumper? If so, the back side of the box provides a great location for mounting a 10L / 2.6gal tank. With a burn rate of .03 gals/hr for a diesel heater you will have around 70 to 80 HOURS of heater running time. This is an easy install.

A harder install would be under floor do to locating the filler in a convenient place. I have thought about the space outboard of the side door step with an filler access port through the interior floor.

Same concept could be used in the rear area of the van to access a filler. The extended vans have an often ignored great space outboard of the frame and behind the rear wheels. I used this space to install a 5.5 gal water holding tank on each side for 11 gals of gray water storage. You could locate a heater fuel tank there with a weather tight access port just above provided your interior layout will accommodate that.

A strong consideration is how often will it be necessary to fill the tank w 80 hrs of actual running time per 2.5 gals usage. Also, a nice feature of the aux diesel tank dedicated to the heater is the ability to use kerosene which burns cleaner.
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Old 09-17-2020, 10:24 AM   #4
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Be careful of using kerosene vs. diesel - diesel will lubricate the pump, kerosene won't. Most of these pumps are designed for the fuel to lubricate the pump, and if it doesn't the pump wears out very quickly.
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Old 09-17-2020, 02:37 PM   #5
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A buddy mounted a small 2 gallon fuel tank in an underbody bracket he built, that allowed easy removal. I think he either used some extra fuel line that allowed the tank to be removed for filling, or he ran the pick up through the filler cap, so it could be easily removed. Either way, it only took moments to pull the tank for filling.
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