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How To Fix A Leaking Gas Tank

When driving a car, a leaking gas tank isn’t the most common problem but could be your worst nightmare. Gas leaking from cars is quite risky, if not repaired. Besides costing you a lot of money in wasted fuel, it can be lethal in case of an explosion or fire. Gas tank leak repair, however, is not that expensive. In this article we have focused on the popular reason behind the ways of how to fix a leaking gas tank.

Common Causes of Gas Leaking from Car

  • Sharp objects: Gas tank leak may happen because of sharp objects like rocks, which are thrown up by the car’s tires. The serious collision will cause small holes in the gas tank, then it starts leaking. Punctured gas tanks should be replaced as soon as possible.
  • Corrosion: In some areas, snow and salt will corrode your car tank more than usual. Depending on the position of the leak, there might be a serious risk that the leak becomes worse if it isn’t fixed.
How to fix a leaking gas tank
How to fix a leaking gas tank (Source: Pexel)

How to Fix a Leaking Gas Tank

Many drivers asked: How to repair a leaking gas tank? Well, you can get your gas tank repaired by a mechanic. They might only repair it without fully replacing it and show you the reason behind the leak. Moreover, it is always advised to go for some effective maintenance tips by experts for more understanding.

However, if you want to save more, you can do the gas tank leak repair job at home. But to do so, you should have the basic understanding of how it works. It will not take you more than $100 to get the job done. Keep reading to know the detailed stages how to fix a leaking gas tank efficiently.

Fix Leaking Gas Tank
Patch a gas tank might be quite troublesome (Source: Pexel)

Necessary Tools

  • Clean towel or rag
  • Filtration mask
  • Safety glasses
  • Jack stands
  • Sandpaper
  • Gas tank repair epoxy putty compound
  • Rubbing Alcohol or other degreaser
  • Car jack
  • Vinyl or kitchen gloves

How to Do

Step 1: Jack up the Vehicle

Firstly, you need to lift the car to a height where you can easily insert jack stands underneath it. Now, you slowly lower the jack to maintain a height where you can easily get underneath the vehicle and perform the repairing task.

Use a jack if you need to access the gas tank on a vehicle. A car’s fuel tank is accessible from below, so you won’t be able to reach it without using a jack. Place the jack underneath a jack point along the car’s frame, lift it up, then position the jack stands around it to support the car’s weight. Lift up the rear end of the car on both sides. Then, locate the tank, which will be underneath the gas cap you open when refueling your car.

  • Park on solid, flat ground before attempting to lift the car. Make sure it’s stable on the jack stands before you crawl underneath it.
  • Unless the gas tank has already been removed from the vehicle, you can’t repair it without getting underneath it. Most leaks are visible from the underside and can easily be patched up.
  • If you’re fixing an accessible tank, you won’t have to use jacks. For example, jacks aren’t necessary for motorcycles or lawnmowers.

Step 2: Locate the Leak or Hole in the Gas Tank

Once you are under the gas tank, check it carefully to locate the source of leakage or small holes dripping gasoline. Notice that in some cases, the hole is obviously small and hard to find.

Step 3: Sanding the Leaky Area

Now sand the holes using sandpaper. You need to cover an area of 1.5 to 2 inches around the hole.

Step 4: Wipe the Surface

After you are done sanding, use a degreaser to wipe the area with a towel. You can also use alcohol. Make sure all grime, dirt, and grease are cleaned away.

Fix A Leaking Gas Tank
Gas tank leak repair (Source: Pexel)

Step 5: Blend the Epoxy

For mixing the epoxy compound, the manufacturer’s manual will come handy. Use compounds from two different tubes to create a mixture and use it before it dries up. The instructions for mixing the compounds are usually written on the packet.

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Step 6: Shape and Apply the Epoxy

Now, from the mixture, you cut a piece of about 1-1.5 inches. And, create a small shaped cone using the epoxy compound with a wider base at the bottom and a tip at the top

Step 7: Press the Epoxy in the Hole

Next, you use the top of the cone to fill in the hole in the tank. Keep pressing the epoxy until it fills the hole or holes for good and use the remaining to smooth the sanded area. A little bit of water can make the smoothening process easy.

Step 8: Fill the Tank with Gas

This is the last step in your gas tank leak repair job. Fill in the tank to the fullest, as you normally do. Once the tank is filled, look out for any signs of leakage. If you followed the above mentioned steps properly, the leak should be sealed for good and you can take credit for a successful gas tank leak repair job.

Frequently Asked Questions

In order to provide great understanding of gas tank – the most essential car part, we will help car owners answer some common questions: 

How much does it cost to fix a gas tank leak?

Between $50 and $120$. Since fixing a gas tank leak is such a simple task, the mechanics shop usually takes $120 maximum for a repair facility. Some car owners can even fix them at home.  

Can you drive a car with a leaking gas tank?

We suggest you do not. This is due to the fact that gas is strongly flammable. A leaking gas tank is a threat while driving since the gas can catch fire by friction. Not to mention, the gas might create a slick surface, which is very dangerous for other drivers. In conclusion, it is recommended not to drive a car with a leaking gas tank because of its potential of injury, heavy burns, or even death from gas leak fires. 

Will Flex Seal hold up to gasoline?

No. Because Flex Seal cannot withstand extreme temperatures or pressure, therefore it cannot hold up to gasoline. And it cannot be used on any flammable material like gasoline tank, oil tank. 

Will JB Weld fix a leaking gas tank?

Yes. With a JB Weld Autoweld or a SteelStik epoxy putty stick, drivers can perform a wet repair with no problem, especially with Steelstik epoxy since it can withstand the pressure of 900 psi and 300 degrees temperature. This is the fastest and most suitable method in order to fix leaking and keep your fuel from spilling out the tank. 

Can you use JB Weld on plastic fuel tank?

Yes, but only for a short-term as an emergency solution. Car owners use J-B Weld in order to repair a temporary wet from a gas tank. So this product can be used with the purpose of temporary fix before replacing the tank. 

Can a hole in a gas tank be repaired?

Yes, but it is quite complicated. If you find a hole in the gas tank of your automobile, it is possible to fix it without replacing the whole tank. Before repairing, you need to perform at least three steps: First of all, you need to remove the fuel lines. You do not want to fuel to get in the way when fixing. Second of all, it is suggested to clean the tank thoroughly and completely. Last of all, you must use a wax scraper to scrape off the oil and old rust coating. Now you can fix the hole in a gas tank. 

Why does the car smell like gas?

There are many factors that create these issues, however, most of them are from gas tanks. If the fuel pressure regulator is not compatible, the gasoline will burn too much and be wasted. This could lead to gas fumes oozing out from the exhaust of your vehicle. Not to mention, these vapors also get inside the ventilation system from the leaking and cause the interior to smell like gas.

What is the best sealant for gasoline?

Our recommended solution is Permatex PermaShield. When it comes to polyester urethane sealant with powerful resistance to all kinds of automotive fluids, Permatex PermaShield Fuel Resistant Gasket Dressing and Sealant is our recommendation. It is also suitable for many applications, from axle assemblies, oil pans, to fuel injectors.

What kind of glue is gas resistant?

We have Seal-all as the glue for gas resistant characteristics: It is the most favorite glue of mechanics, hobbyists, and our car experts. Not only it adheres with amazing strength, it is also gas resistant and prevents solvents, oil and paint thinner.