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Q&A for How to Seal a Plastic Gas Tank

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Is Flex Seal gasoline resistant?

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According to the manufacturer’s website, Flex Seal is not a good choice for sealing gasoline tanks. It’s not made to withstand a lot of heat or pressure, and it’s not recommended for use with flammable liquids, such as gasoline.

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How do you fix a plastic gas tank on a lawnmower?

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A fiberglass repair patch will work well for this job. Drain the tank and let it dry completely first, and don’t forget to sand the area around the leak or hole so that the adhesive compound can adhere properly.

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Question

Will Teflon tape seal in gasoline?

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No, the gasoline will eventually break down the tape. If you want a quick and easy fix, a fiberglass patch is a better option.

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Question

Can I use JB Weld on a gas tank?

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J-B Weld can be used for a temporary wet repair to a gas tank. Follow the manufacturer’s instructions and be sure to treat this as a temporary fix before replacing your gas tank, as it’s only a short-term patch-up solution.

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Question

Is J-B plastic weld gas resistant?

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According to the manufacturer’s website, "When fully cured, J-B Weld is completely resistant to water, gasoline, and about every other petroleum product or automotive chemical."

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What type of plastic is used in fuel tanks?

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The main type of plastic used in fuel tanks is high-density polyethylene (HDPE), and this shaped by a process known as "blow molding" (Wikipedia). Other plastics that may be present in fuel tanks include: Polypropylene (PP), regrind plastic (recycled polyethylene) and possibly plastic adhesives.

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Question

How do you fix a leak in a gas tank?

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It is recommended that you follow the steps above, which explain how to seal small holes and tears. If the hole or tear is large, it is likely beyond repair and will need to be replaced.

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Question

Can a seam in a lawnmower's plastic fuel tank be repaired using a hot glue gun?

Community Answer

Probably not. The best way to repair is a plastic welder with a plastic rod that matches the plastic of the tank.

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Question

Can I seal a plastic gas tank with fiber glass?

Community Answer

Yes. Use a product called Tiger Paste, which is fiberglass and resin all in one. The tank MUST be clean of all dirt, grease and oil. Seal the entire tank except for filler and any vent pipes, or pick up tube openings.

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What grit of sandpaper should I use to sand a plastic fuel tank?

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You should use 80 or 100 grit sandpaper. 60 grit will work, as well. The idea is to scuff the area, so that the epoxy will have a stronger bond.

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Question

Will Flex Shot seal a crack in a plastic gas tank?

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It is doubtful because the gasoline will likely dissolve the adhesive in short time, as well as the rubber portion of that stuff. Epoxy or plastic welding are the best options.

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Question

Where can I purchase a plastic welder?

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Plastic welders are quite expensive. Unless you're going to start a tank repair business, it may be smarter to rent one. If you really want to purchase one, there are many to choose from online.

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