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Old 03-22-2019, 06:11 AM   #1
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Pumping fuel from RV to Vehicle

I'm in the process of becoming and an insurance CAT adjuster, meaning that I would be sent to areas devastated by either hurricanes, tornadoes or floods. One problem when arriving at these areas is that there is often no fuel available. I know a lot of adjusters who carry extra fuel cans. I'm thinking that if I fueled my RV shortly before arriving at the area I would have a lot of extra fuel in the RV tank. Since both my vehicle and RV have diesel engines, it would make sense to simply pump fuel from my RV tank to my vehicle. The RV tank holds 100 gallons and I believe fuel would likely be restored to any area long before I came close to emptying that tank. Of course I would need to allow enough for generator usage. I'm just trying to find the best way to transfer the fuel. I used to work for a company the built luxury house boats. Each boat had an electric pump and gas spigot so customers could pump gas from the large boat tank to their smaller boats or jet skis. Has anyone done this? Another option would be to use a simple drill operated pump and drop the hose in the tank. Any input would be appreciated.
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Old 03-22-2019, 06:30 AM   #2
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Many years ago when I owned our boat in the Galveston Bay area, there was a guy who had a gas boat and ran out of fuel while out in the bay. Another boat came to his aid and they started to transfer gas from one boat to another...then Kaboom. A big explosion, both boats completely burned up, couple of fatalities etc, etc. It was a real big deal and the Coast Guard got involved. Cause....? Reports said static electricity from the pump being used was the cause.

Now, in your case you have diesel. Not as volatile for sure. But if it were me wanting to accomplish this, I would drop a plastic tube in the MH tank and use some kind of a hand held crank pump or something else that in no way was connected to electricity and/or could not generate any static electricity. Fuel of any kind IMO is just to dangerous.
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Old 03-22-2019, 06:34 AM   #3
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Originally Posted by marjoa View Post
Many years ago when I owned our boat in the Galveston Bay area, there was a guy who had a gas boat and ran out of fuel while out in the bay. Another boat came to his aid and they started to transfer gas from one boat to another...then Kaboom. A big explosion, both boats completely burned up, couple of fatalities etc, etc. It was a real big deal and the Coast Guard got involved. Cause....? Reports said static electricity from the pump being used was the cause.

Now, in your case you have diesel. Not as volatile for sure. But if it were me wanting to accomplish this, I would drop a plastic tube in the MH tank and use some kind of a hand held crank pump or something else that in no way was connected to electricity and/or could not generate any static electricity. Fuel of any kind IMO is just to dangerous.
that's why you see pickup trucks with tanks and hand pumps in the back
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Old 03-22-2019, 06:56 AM   #4
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I come from a mining background which relies on mobile lube/fuel trucks to keep fleets going. The vehicles usually hang a chain from the vehicle to ground it. The equipment is diesel. This is pretty much an industry standard and accepted by government safety inspectors.

You could also use a retractable ground cable from the RV to the automobile.

On a recent business trip, while sitting in a plane waiting to back out from the bridge, it was fueled. The driver pulled up and the first thing he did was run a grounding wire from truck to plane.

You should be able to plumb in a 12 volt pump into the line that feeds the generator, put a T in the the line and a good valve to make sure it won't suck air when running generator. If you don't want to plumb something in you could use a small transfer pump into the fill hole but the chances of contamination is high and not the best option.
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Old 03-22-2019, 07:10 AM   #5
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that's why you see pickup trucks with tanks and hand pumps in the back
No. For diesel, hand or electric pump depends on the value the owner puts on the time spent pumping fuel.
It would not be hard to add a pump and fitting for hose to pull out of tank. Getting hose down the neck might be a challenge, but if you can, hold a rag around blow in tank with compressed air will shove fuel out the hose. I would often put hose in the tank as far as I could, seal the end with thumb, pull out and down until the fuel in hose is below top of fuel in tank to start siphon.
If the toad is a pickup a transfer tank in the bed might be best plan.
One advantage to gasoline, if you spill a little, don't make a spark, in a few minutes it is gone. Diesel, you got to clean it up.
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Old 03-22-2019, 07:43 AM   #6
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If you use a clear hose and can tap into an air supply, using an air nozzle with a small dia pipe outlet, poke a hole in upper end of hose and insert the nozzle in the direction of flow, apply air till fuel starts to flow....pull nozzle out and it'll fill whatever....
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Old 03-22-2019, 09:07 AM   #7
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When we had our boat, with 70 gal fuel tank, I emptied the tank into 5 gallon jugs at least twice a year to clean it. I used an electric fuel pump with hose and attached it to the 3/8 fuel line at the fuel filter. From experience it is a lot slower than pumping fuel into the tank at a service station. My guess is that you will find filling your car/truck tank using the fuel line from the generator to be unsatisfactory. I would tend to find a way to carry several 6 gallon portable containers. Perhaps in a hitch mounted rack on your toad?
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Old 03-22-2019, 07:11 PM   #8
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https://www.jmesales.com/piusi-stand...-transfer-kit/
Seems like this all be it pricey would at least keep from getting your RV or car nasty. the suction hose could go to a cam lock or other no drip quick connect fitting if you tap a line.
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Old 03-22-2019, 07:49 PM   #9
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Don't modern fuel tanks have restrictors in the fueling hose to prevent theft from siphoners?
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Old 03-22-2019, 08:48 PM   #10
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All our service trucks have a 12v electric pump that taps straight into the fuel tank. We use them for filling our equipment when there aren't fuel storage cells on the job sites. Don't see why your RV couldn't have something similar.

My Toy Hauler has a fuel tank and pump behind the axles. Never used it but considered filling it with cheap diesel before returning to California a few days ago!
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Old 03-22-2019, 09:40 PM   #11
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You say your coach and toad both use diesel. Is your toad a truck....if it is, put a tank in the back. That way you could pump your own fuel into the truck and the coach.
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Old 03-23-2019, 05:18 AM   #12
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Quote:
Originally Posted by marjoa View Post
Many years ago when I owned our boat in the Galveston Bay area, there was a guy who had a gas boat and ran out of fuel while out in the bay. Another boat came to his aid and they started to transfer gas from one boat to another...then Kaboom. A big explosion, both boats completely burned up, couple of fatalities etc, etc. It was a real big deal and the Coast Guard got involved. Cause....? Reports said static electricity from the pump being used was the cause.

Now, in your case you have diesel. Not as volatile for sure. But if it were me wanting to accomplish this, I would drop a plastic tube in the MH tank and use some kind of a hand held crank pump or something else that in no way was connected to electricity and/or could not generate any static electricity. Fuel of any kind IMO is just to dangerous.
It's counterintuitive, but transferring fuels like that is what can generate a static charge. Fuel filling hoses have metal braid and metal ends, to discharge any static potential between the vehicle and pump. If you buy a hand crank fuel transfer pump and the hose assembly made for it it will be the same.

Which is not to say plastic siphon hoses are death traps. If they were, I'd not be alive to write this. In most situations, the fuel can is on the ground, so static potential can discharge to earth.
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Old 03-23-2019, 06:44 AM   #13
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You say your coach and toad both use diesel. Is your toad a truck....if it is, put a tank in the back. That way you could pump your own fuel into the truck and the coach.

Or set it up as an auxiliary tank plumbed so you could switch between tanks from inside the cab.


Keep in mind your generator needs a certain amount of fuel in the tank to be able to run.
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Old 03-23-2019, 07:34 AM   #14
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Is the diesel vehicle you are wanting to refill a pickup? If so, a tank in the bed would likely be the best option:


https://www.agrisupply.com/crew-cab-...-tank/p/86463/


It would be easy to install or remove based on need.



Additionally, most diesel tanks have several plugs on the bottom. I have seen people install valves in them. If your tank has one , it would likely be easy to set up a valve which would allow you to connect a hose and fill a 5 gallon can to transfer fuel into the vehicle. Letting gravity do the work for you would be much faster/ easier than using a siphon or a pump Static is not an issue with diesel fuel, so this operation has no risk.
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