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Siphon gas for generator from my boat

Old 06-28-2019, 12:52 PM
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Default Siphon gas for generator from my boat

I moved to southwest Florida in May of 2018. I wanted a whole house generator system, but was appalled by the cost to install one. So I had the idea to buy a generac gp1500e "portable" generator. Its on wheels and sits in my garage. The fuel source is gas. My boat has a 200 gallon tank (see where I'm going with this). And I plan on using the rec 90 gas when the time occurs that we don't have electricity. The generator will run almost everything we need, including the 3.5 ton a/c, at one time, when properly managed. Since I don't plan on having 2 dozen 5 gallon jugs around, only 3 or 4, I need a good idea on how to siphon the gas from my boats tank to a 5 gallon jug. I'm not sure what length of siphon, what type of material, whether or not it could damage my tank(I guess I should've thought of that first). Does anyone have a good idea on how to settle my concerns?
Old 06-28-2019, 12:56 PM
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This has been done by several members in various regions. Depending on how your fuel lines are set up, you may be able to use one to drain the tank from the 'out' line into a jug. There are many different types of connectors to choose and you wont have to worry as much about fumes and contamination or spillage. Good luck!

Last edited by Kamper; 06-28-2019 at 01:42 PM.
Old 06-28-2019, 01:03 PM
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get a jiggler
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Old 06-28-2019, 01:03 PM
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We did just that two years ago when Irma hit and we were without power for six days...

I disconnected one of my fuel lines at the primer bulb, added a few feet of hose and drained gas as I needed it. Yes, it was slow, but I could fill six gallon containers down on the ground and when done, store the hose higher than the tank and all was fine until I needed it again..

My generator is 8700 watts and would run most of the house as well as two refrigerators/bait freezers in the shop
Old 06-28-2019, 01:04 PM
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I disconnect the fuel line at the engine or fuel separator and use two lengths of hose and a 12.00 electric automotive fuel pump.
Old 06-28-2019, 01:08 PM
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Just get some extra fuel line. Attach it on the back end of primer ball. Pump the ball to get the fuel flowing and let it fill up a 5 gallon gas can.
Old 06-28-2019, 01:11 PM
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Great ideas. Thank you very much. I didn'treally want to stick a hose down the filler tube.
Old 06-28-2019, 01:12 PM
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Is your boat on a lift or kept higher in the water? If not, it makes it trickier to siphon.

Do the fill pipes go straight into the tanks? If so you can just get a small 12v electric fuel pump and just drop a line into the tank through the fill port. You can either fill a 5 gal can or just run the line to the generator and fill the tank directly on the generator (when you shut it down to check the oil).
Old 06-28-2019, 01:52 PM
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I'm not sure. I'll reach out to Everglades on Monday. The boat will either on my lift or on the trailer and next to my house
Old 06-28-2019, 02:27 PM
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All you need is some fuel line a double barb and a 12 volt fuel pump. You can buy everything on eBay.
Old 06-28-2019, 03:56 PM
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Your boat tank should have an "Anti-syphon valve" per (I believe) CG regulations.
But using an electric fuel pump you can get the gas out and it's quicker.
Old 06-28-2019, 04:29 PM
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I installed a little fuel pump on my boat, it feeds from one of the outputs of the fuel filter, I use it to refill the dinghy and generator, works great... amazon sells one dedicated for fuel called little red pump (I think)
Old 06-28-2019, 04:47 PM
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Thank u very much
Old 06-28-2019, 05:43 PM
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Thank u very much
Old 06-28-2019, 06:16 PM
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use an electric fuel pump, easiest way to move gasoline.
Old 06-28-2019, 06:35 PM
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I have a cheap 12V fuel pump I bought for just that purpose. My boat is usually at least half full which means at least 30 gallons of good gas sitting there for generator use during a power outage. When Katrina hit in 2005 fuel for generators was the biggest problem we had. It's not really practical to keep a lot of gas sitting around but that sitting in the boat is a perfect standby supply.
Old 06-28-2019, 07:01 PM
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How long will your generator run on a tank of gas under load?

have you explored an external gas tank (6 gallon marine with a Yamaha quick connect fitting)? I have several of these that quick connect to my generator.

Suggest you google extended run tanks (there a few threads on THT on this.

Figure out if you’re going to run synthetic oil in your generator and how often you need to change it. Get back up oil.

Do you have a 110v window unit or two that you can use if you don’t have enough Watts for run your big A/C?

I would suggest you do a trial run to make sure you got the correct cords, connectors and stuff.

9 days Post Katrina w/o electricity and 10 days Post Gustav without power. We siphoned gas from neighbor's boat to fill the external generator gas tanks.

Good plan to worry about the gas supply but I’d check the whole set up.

good luck.

Last edited by Bayou Dularge; 06-28-2019 at 07:30 PM.
Old 06-28-2019, 08:07 PM
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I'm putting that data together. I have 2 portable 110 ac units that we'll run at night. I can't imagine not living here. Just have to make a few adjustments. Thanks
Old 06-28-2019, 10:52 PM
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That thing says it burns 1.6 gallons an hour at half load so don't be shocked if that is more. If your boat is full you are talking 5 or 6 days. Keep that in mind. Is the boat going to be parked anywhere near the generator? Maybe you could run the line straight from the ouboard hose connector to the generator with the appropriate fuel fittings and an "extension" hose. That would save a lot of hassle.. .
Old 06-29-2019, 03:36 AM
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I thought about running a line directly to the generator, but then i wouldn't know how many gallons it was consuming.

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