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Old January 26th, 2015, 08:43 AM
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Default auxiliary fuel tanks

Making a few gas powered vacuum pump set up and need more fuel capacity. I found these at Surplus Center.

4.5 GALLON RED FUEL TANK W/FUEL SHUTOFF VALVE

I also want to mention that not all gas engine have a suitable carburetor for changing over to a bigger gas tank. If you have a briggs with the tank under the carb it wont work. Make sure you have a gas line from the tank to the carb and its gravity feed.
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Old January 26th, 2015, 12:13 PM
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But if you did have an engine that has the tank below carb. All you have to do is modify the cap of the fuel tank to allow a fitting to come thru. Then you need a simple boat tank with primer bulb and you have added extra fuel capacity. The trick is to get the cap leak proof and the fitting as well. For the little Yamaha and Honda generators they even sell a gas cap conversion for this mod already. I am sure it would be easy to apply to other gas tanks as well.
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Old January 26th, 2015, 11:52 PM
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Was told that the float can be a problem with the pressure from a bigger tank.
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Old January 27th, 2015, 05:53 AM
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When I had a gas pump I put a 5 gallon tank on it. If was a Briggs. Most days were fine. Sometimes it seemed to airlock. I would go start pump then go back an hour later to check on it and muffler was cold. Would start right back up. Drove me nuts.
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Old January 27th, 2015, 07:44 AM
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Quote:
Originally Posted by Haynes Forest Products View Post
Was told that the float can be a problem with the pressure from a bigger tank.
I think Radangel was describing the adapter for the smaller generators?

Honda Generator Fuel Extender | eBay
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Old January 27th, 2015, 09:13 AM
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Yes they make those kits I have 2 inverter generators and that is an option. I went a little bonkers last year with a 3.5 hp Honda engine that I use a auxiliary tank on. After having it quit all week long I finally figured out the problem was the fuel line came out the top of the tank. It wouldn't gravity feed because of the slight siphon needed to get the fuel to flow was to great. I know it should have self fed BUT it didn't. I ended up with the tank on its side only 1/2 full on some cinder blocks and it ran flawlessly.

I would have been better off drilling a hole in the bottom of a 5 gallon plastic gas can and shoving a slightly bigger hose in the hole so it didn't leak. Just like chain saws, weed whackers, and most small engine equipment.
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Old January 28th, 2015, 09:49 AM
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I also want to mention that not all gas engine have a suitable carburetor for changing over to a bigger gas tank. If you have a briggs with the tank under the carb it wont work. Make sure you have a gas line from the tank to the carb and its gravity feed.

This part is what I was refering to Hanyes for this type of setup why not byPass the small gas tank altogther and run a boat style tank with primer bulb right into the carb with a inline fuel filter. Look at a small outboard motor small carb 5 gallon tank with primer bulb.
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Two Yamaha Grizzly atv's.
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Old January 28th, 2015, 10:07 AM
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On your generator setup Haynes did your auxiliary tank have a primer bulb on it. I think part of the problem people have with these setups is the cap itself. They are mass produced and I believe sometimes leave pin hole leaks into the system causing loss of syphon. Where as a gravity system this is not so important to be so air tight.
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Little sugar house has a 28x66 flat pan.
Big Sugar house has a 3x8 pan with dividers and auf.
Two Yamaha Grizzly atv's.
All taps on drop tubes into buckets.
Smoky Lake Filter/Finisher/Filter.
Smoky Lake Crescendo Auto Draw.
Brother-in-law for a partner in crime.
Wife and 4 kids.
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Old January 28th, 2015, 01:31 PM
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Radnagle My words exactly. I do bypass the tank but Im running the small tank during construction. I have a smaller set up that I removed the tank.
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Old January 29th, 2015, 12:27 AM
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beter get your gas line off the belt or it wont run long that way
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