Asked by: Lyndsay Mudrak
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How do you change a primer bulb on a Stihl weedeater?

Unscrew the four screws that hold the primer bulb unit in place with a Phillips screwdriver. Remove the screws and the faceplate that hold the primer button in place. Pop the bulb out of the faceplate.

Also asked, how do you change a primer bulb?

Reviewing these steps will likely help with primer bulb replacements on other engines.

  1. Access the carburetor.
  2. Unscrew the two carburetor mount screws.
  3. Remove the old primer bulb.
  4. Clean the carburetor and primer bulb components.
  5. Install the new primer bulb.
  6. Remount the carburetor.

Also, how does a primer ball work? How It Works. Pressing the primer bulb creates a vacuum that sucks gas from the fuel tank through the fuel lines and into the carburetor. Pressing the primer only a couple times should supply enough fuel to mix with air in the carburetor, and be ready for combustion.

Similarly, is primer bulb necessary?

A primer bulb is important because it is helps to fill the carburetor with the correct amount of fuel. It does this by pulling fuel through the fuel line. You may need to fix or replace your primer bulb if: It is not creating proper suction.

How do you start a lawn mower without a primer bulb?

  1. Find the air cleaner and remove its cover.
  2. Proceed to remove the air cleaner itself.
  3. The housing should be clearly exposed by now.
  4. Quickly put the air cleaner back in its original position and replace the cover.
  5. Now, your lawn mower is ready to use without the primer bulb!

Related Question Answers

Omkaltoum Jurries


Does a primer bulb have a hole in it?

the no hole primer is used when the primer is part of the carb itself. Yes the carb bowl vents through the primer hole on the engines with the primer mounted on the air cleaner. It is very common for the air cleaner backing plate, to warp were it mounts to the carb, and if it doesn't seal, when not prime.

Presentina Lizariturri


Which fuel line goes to the primer bulb?

The (clear) fuel intake line runs from the top of the carburetor (straight nipple) and goes to the short post on the back of the primer bulb. The return line (blue) comes from the long post on the back of the primer bulb and goes into the bottom of the fuel tank.

Maureen Hijano


Do primer bulbs need to be filled with gas?

You should have fuel in the bulb when running. If you do not, the check valve in the primer is bad. It is essentially not seating and drawing air in through the discharge port.