Snowmobile bad fuel pump symptoms

Snowmobile bad fuel pump symptoms DEFAULT

9 steps for testing a snowmobile fuel pump

  1. Start by removing the body of the snowmobile in order to reveal the fuel pump, engine and carburetor. This can be done by lifting your engine cover or may require removing bolts.
  2. Remove the tubing connecting the fuel tank to the fuel tank inlet on the fuel pump.
  3. Attach the vacuum gauge to the fuel tank inlet.
  4. Crank your engine.
  5. Check the gauge to see if a vacuum is reported when the engine is cranked.
  6. Remove the tubing connecting to the crankcase of the engine.
  7. Make sure that there is a pulse in the hose.
  8. Remove the line that attaches from the pump to the carburetor.
  9. Attach the gauge to this line and ensure that there is pressure when the engine is cranked.

Note that if there’s no vacuum on the fuel intake end of the pump, then your fuel pump is defective. If there is a vacuum on the intake and a pulse in the crankcase, but no pressure to the carburetor line, then your fuel pump is also defective. If there is a vacuum on the fuel intake, pulse in the crankcase hose, and pressure on the carburetor line, check all of your tubing to ensure that there are no leaks or cracks.

If your fuel pump is malfunctioning, you can use a rebuild kit to repair it rather than buying a new fuel pump. Fuel pump repair kits typically cost anywhere from $5 to $20+.


A snowmobile can be used for a few different things including fun, work, and even as a way to get from point A to point B. Although you can use it a few different ways, you will want to ensure it is working properly before you do use it. After all, you don’t want to be out in the snow having fun, or working to plow the snow, or even using it to get from one place to another and it break down on you while using it. That is not fun at all. Keep reading to learn how to test fuel pumps so you can use your snowmobile the way it was meant to be used.

Step One: Remove The Engine Cover

Your first step in testing the snowmobile fuel pump is to remove the cover to show the fuel pump and the carburetor. This could be as simple as just removing the cover or you may have to unbolt it.

Step Two: Removing The Fuel Tank Tubing

Your next step in testing the fuel pump is to take the tubing that is keeping the fuel tank and the fuel tank inlet connected. You will then connect together the vacuum gauge to the fuel tank inlet.

Step Three: Start Your Engine

Now you need to start the engine. After starting the engine, check the gauge to ensure the vacuum is reported while the engine is running.

Step Four: Remove More Tubing

Now you have to remove more tubing. You will need to take off the tubing that goes to the crankcase on the engine. Once you do this, check to make sure there is a pulse coming from the hose.

Step Five: Removing The Line

Now you will need to remove the line that is attached to the carburetor from the pump. Now you take your testing gauge and attach it to this line. You will then need to ensure there is pressure while the engine is running.

Important Things To Remember

There are a few things you need to take note of while testing the snowmobile fuel pump. If you don’t find a vacuum on the fuel intake part of the pump, then the fuel pump is bad. However, even if you do find a vacuum on the intake and there is a pulse coming from the crankcase, but if there is no pressure coming from the carburetor line, your fuel pump is bad. Now, if everything seems fine, you should also check to make sure there aren’t any cracks or leaks coming from the tubing.

Instead of buying a replacement snowmobile fuel pump, which can be expensive, you can just buy a repair kit to fix the fuel pump that went bad. These don’t cost nearly as much as buying a brand new one and can save you a lot of money.


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I've received emails and PM's asking me about "Group Buys" and promotions.

A Group Buy here on would be a situation where a normal member (non vendor or mfg) personally collects orders from other members. That member then uses those orders to negotiate a better price with the Vendor/Mfg for HIS/HER "Group" of buyers.

Here is an example of a viable "Group Buy"

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If a members wants to become a group buy manager, maintain a thread and collect the funds and negotiate a group buy... as a member, you are welcome to do that as long as you are not attached to the business of the vendor or Mfg.

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As ALWAYS, since DAY ONE of me becoming a moderator, I have pioneered, supported and encouraged vendors and mfgs in getting the word out to our readers with "New Product Announcements.

Have a great season.

From this point on, all vendors/mfg's promoting Pre-Season tiered sales programs, in the Polaris Forums, that are not paid advertisers will be appropriately moved to the swapmeet section of the forums.


Will a Bad Fuel Pump Cause System Lean Issue?

The fuel pump is a crucial piece of equipment for any vehicle, from dirt bikes to trucks to snowmobiles. Without your fuel pump, your snowmobile won't be able to run.

That said, when your fuel pump starts to go south and fail, you need to replace it as soon as possible. Here are some warning signs that your fuel pump may be nearing the end of its life and it may be time to replace it.

Your snowmobile regularly loses power

One of the biggest signs your snowmobile has a bad fuel pump is when you routinely lose power whether you're climbing a hill or going at high speed. In many cases, lost power is actually a sign of another problem such as an engine issue or a pinched fuel line.

But if you're intermittently losing power while you're running your snowmobile and you've already determined the problem isn't related to your fuel filter, engine, or another equipment piece, chances are the issue is with your fuel pump.

You lose power when you come to a stop

Speaking of losing power frequently, a sign that your snowmobile's power issues are related to the fuel pump rather than other parts is if you lose power after coming to a stop.

Your fuel pump needs to deliver fuel to your snowmobile's engine when you drive away from a dead stop. This allows you to drive off.

Bad fuel pumps can cause your snowmobile's engine to stutter because it doesn't have the fuel it needs to accelerate your motor. Your snowmobile might go, stop, and then go again.

It's important to note that, while this is a sign of a bad fuel pump, it can also be a sign that you have a bad oxygen sensor. Talk to your snowmobile dealer or mechanic to get a better idea of the root cause. If your oxygen sensor is running fine, the problem is most likely your fuel pump.

Your engine cranks but doesn't start

A bad fuel pump or clogged fuel filter can keep your snowmobile from getting the fuel it needs to rev up your engine. This can cause your engine to crank, but fail to start.

You may also potentially have an issue with your snowmobile's timing belt or smart plugs so it's important to have your snowmobile checked out before you determine the problem yourself. If it's been over a year since you last replaced your fuel filter, replace the filter and try your snowmobile's engine again.

Best case scenario, you may only need to replace your snowmobile's fuel pump. Worst case scenario, you may need to replace more than just your snowmobile equipment. You might need to replace the entire snowmobile.

Do you need replacement snowmobile equipment?

Snowmobiling is one of the world's most favorite winter sports; up to 118,657 snowmobiles were sold internationally in 2017. But it's important that you take care of your snowmobile too and that you don't just ride it.

Whether you're looking for snowmobile equipment or a new snowmobile entirely to make the most of your winter season, Nelson's Speed Shop has what you need to tear up the snow. To learn more about our snowmobiles for sale or snowmobile equipment, contact Nelson's Speed Shop today.


Symptoms fuel snowmobile bad pump

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Symptoms of a bad fuel pump not starting but crank

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