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How to Seal a Plastic Gas Tank

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How to Seal a Plastic Gas Tank by Kenyans247(m): Sun Jul 2019 07:14am
Plastic gas tanks are in high demand in the world of motorcycle racing and ATV enthusiasts. A plastic gas tank can weigh less than half of a comparable metal gas tank and it is easy to mold into shapes to fit odd configurations. Seamless gas tanks seldom leak and are impervious to the rust and corrosion that affect metal tanks. If a plastic fuel tank does sustain small holes or tears, there are several fairly easy ways to make the repair.



Method
1
Seal Plastic Gas Tank with Epoxy Glue
Image titled Seal a Plastic Gas Tank Step 1
1
Drain the gasoline from the tank and allow it to dry. Sand the area around the hole or crack, and clean the area with a shop cloth saturated with rubbing alcohol.[1]
Image titled Seal a Plastic Gas Tank Step 2
2
Mix the 2 part epoxy together and apply all around the perimeter of the opening.[2] Cut a fiberglass patch large enough to cover the opening and overlap it.
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3
Place the fiberglass patch over the hole and press into the epoxy. Apply more epoxy to the patch and surrounding area, pressing firmly to saturate the patch.
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4
Allow to dry, sand the patched area smooth and spray paint with a plastic paint if desired.

Method
2
Seal Plastic Gas Tank with a Plastic Welder
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1
Buy or rent a plastic welder. Tell the salesperson what you are doing with it to ensure that you get the correct rods.
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2
Remove the plastic gas tank from the vehicle, and set it up in a secure welding area. Drain the gasoline from the tank, and allow it to dry both inside and outside. Don protective eye gear, a welding helmet and welding gloves.
Image titled Seal a Plastic Gas Tank Step 7
3
Use a plastic welding rod made specially for this purpose, and fill in the crack or hole. Start at an edge and run the bead completely around the opening. Then begin crossing over the hole, allowing the rod to fill in the hole completely.[3]
Image titled Seal a Plastic Gas Tank Step 8
4
Allow the weld to set up, sand it smooth and, if desired, paint it with plastic spray paint.
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5
Replace the repaired plastic fuel tank on the vehicle.
Method
3
Seal Plastic Gas Tank with a Soldering Gun
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1
Drain the gas tank, and clean it inside and out with soapy water.[4] Lightly sand the perimeter of the area to be repaired.
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2
Cut a plastic patch, made of a similar material to the gas tank, slightly larger than the hole to be repaired.
Image titled Seal a Plastic Gas Tank Step 12
3
Heat up an electric soldering gun, and drag it around the edge of the crack to create a trench. Move the gun from side to side to push the plastic back into the trench. While the plastic is still soft from the soldering, lay the plastic patch over the area. Continue moving the soldering gun over the area to smooth the plastic, and fuse them together.[5]
Image titled Seal a Plastic Gas Tank Step 13
4
Allow to cool and dry completely. Mix a 2 part epoxy glue, and cover the entire area of the patch.[6] Allow to set up, sand and spray on a coat of plastic paint if desired.

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