how to remove gas from boat fuel tank

How to Remove Gas from Boat Fuel Tank?: 9 Step Process!


It can be very alarming when you are out there with your outboard. And your engine suddenly runs erratically and makes noise. It can be because of air bubbles in the fuel tank. 

So, how to remove gas from boat fuel tank? 

Well, removing the gas from the fuel tank can be an easy job for you. Firstly, you will need to deplete the fuel supply to the engine. Then take the boat to a suitable place. Place a hose between the fuel transfer bulb and fuel receptacle and tank. The fuel must then be drained. 

You must be still pretty much blurry about that matter. Don’t worry, this entire article is only intended to clear your mind.

So, let’s jump on to the details discussion about that matter.  

9 Simple Steps for Removing Gas from a Boat Fuel Tank

Is your boat’s past season just around the corner? Are you worried about the accumulation of residue in your fuel tank?

The air bubbles in a fuel tank are properly ventilated. Air pockets in a fuel system can cause halting, dry retching. Or rejection to start if this is not done. Its kind of similar to bad trigger symptoms.

Some trapped air may cause an airlock in the fuel pumps, causing the engine to run erratically or even stop. Furthermore, friction can cause the fuel pumps to overheat.

There are multiple reasons why you should regularly flush your fuel tank. You can effectively do it yourself to save money. All you need to know is how to drain gas from the boat fuel tank in a step-by-step process.

If your fuel tank is in danger of being damaged, this procedure will save you money on professional fees and repairs. Knowing how to drain the fuel tank on your boat is a skill you didn’t realize you needed.

It is risky to drain the gas from your fuel system. If not done correctly, it has the potential to start a fire. Having these components on hand will drastically decrease the number of collisions.

You will also need some safety precautions in addition to protecting your fuel tank from potential damage. Some tools as well as step-by-step instructions to keep yourself safe throughout the procedure.

Tools you will need 

Don’t worry, removing gas from the boat fuel tank is an easy task. And you don’t need to pay a sack of dollars to buy any machinery. The thing in your toolbox might do the work just fine.

Or you might need to buy a thing or two from your closest auto parts store. Here’s what you will need.

  • Flathead screwdriver 
  • Fuel hose 
  • Fuel transfer bulb or Primer bulb 
  • Hose clamp 
  • Fuel receptacle
  • Work gloves
  • Protective gear

These tools might be just enough for you to get the job done. But, obviously, you could use some stage process instructions.

Here I have briefly described some step-by-step guidelines for you to follow. 

Step 01: Race the boat into the water

To begin, lower the boat into the water. This will deplete the motor’s supply line.

However, do not burn all of the fuel inside the engine. It may cause troubleshooting of transmission

You must keep 1/8 of the gas in the tank. A water muff is another option for this step. Connect a hose to the fluid intake of your boat engine to dehydrate it.  And flush in water to avoid harming the engine. 

Turn on the water tap once the hose is connected. Then place the vehicle in neutral and start the motor.

Step 02: Park the Boat In a Level Area

Once the running is complete, shut off the engine and depart the water. You can load it onto a trailer and transport it to a level area.

Step 03: Wear Protective Garments

When you arrive at your preferred site, you must put on protective clothing such as rubber gloves, a mask, and eye protection.

Step 04: Connect the Pipe to Either Primer Bulb or the Fuel Transfer Bulb

When you complete this step, two things can happen. Attach the hose directly to the fuel transfer bulb.

In some cases, however, a connector may be required. It’s as simple as stiffening the hose buckle on the side of the primer bulb. Even so, a screwdriver may be necessary.

When connecting the other end of the hose to the template or fuel transfer bulbs, protect the lock with a screwdriver.

There are so many fuel transfer bulbs in the market. Some are labeled, while others are not. Choosing one can be quite perplexing.

That is why I have gathered a selection of high-quality branded fuel transfer bulbs for you.

Product 01 
Product 02

These bulbs are of the highest quality. Additionally, they will last an extended amount of time.

Step 05: Connect the Pipe Line to the Fuel Receptacle

Connect the other end of the nozzle to the fuel container after linking it to the compressor. It allows the boat to collect the drainage from the fuel tank.

Step 06: Connect the Hose to the Fuel Tank

Disable the tank’s cap and check that the hose reaches the container’s bottom.

Step 07: Empty the Tank

This is the section where you configure everything. You can choose a fuel transfer bulb to switch it on, and poof! It is self-contained.

Squeeze the template bulb firmly to enhance draining. Then you must keep pressing until all of the fuel has been ejected.

Step 08: Clean the Tank 

Following the oil tank’s emptying.  You can even use the compressor as a suction to suck in the dirt, residue, and other undesirable particles. You must be thorough because some things may surprise you.

A hot pressure washer would be ideal for cleaning any hard-to-reach areas. When draining the tank, first disconnect the lines.

After deep cleaning is complete, refill your tank with rubbing alcohol or seafoam tidier. Any of these substances have the potential to break up the residue.

After removing any unnecessary elements, you can allow fresh air into the fuel tank for a short period of time. Draining the fuel will be easier in the future if you spend some time cleaning up the tank.

Step 09: Set Everything as Before 

Close the tank and remove the hose after you’ve drained the fuel from your boat. You must be in charge of gas disposal and aftercare. After that, you can return the boat to its trailer and store it.


Is the fuel tank equipped with a drain plug?

There is no drain plug on the cylinders. The most effective method of draining the fuel is to disconnect the nozzle from the filter, which is typically located on the motorist’s side of the frame just ahead of the fuel tank.

Is it able to integrate vintage and modern gas?

If the gas is properly stored, it retains its full combustibility. They believe it is acceptable to mix old and new grassed-up vehicles. They do, however, recommend that drivers mix them in the proper proportions.

Is 2-year-old gasoline still safe to use?

No, a gas that is more than a year old can be harmful to the engine. This can cause motor banging, sputtering, and blocked-up injectors. Over two months old gas is relatively safe to use, with only slight framerate drops.

Bottom Line 

Thanks a lot for tagging with me till the very end. Hope you are clear about the matter of how to remove gas from the boat fuel tank

If you find any hassle with the whole process feel free to call a professional to do the job. 

Best of luck.

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