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How do I replace the primer bulb on a ryobi ry10520

My primer bulb has broken and I need to replace it. I found the replacement part, I am looking for a how to guide to see what I am in for.

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6 Suggested Answers

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Posted on Jan 02, 2017

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SOURCE: I have a broken primer bulb for an Echo CS-3400

You should be able to get to it if you just take off the cover that surrounds it. If you do not yet have a bulb purchased, I would reccomend trying the site I have below. I have also put the part number you will need to enter in the 'Search' box on the site to get the right bulb.

web site:

Part #: ST-615-811

Posted on Mar 07, 2009

  • 2220 Answers

SOURCE: model 3516 primer bulb broken

I wish I could help. There are no parts available, there are no Exploded parts lists I've found a link to. These are Chinese chainsaws with the McCulloch name. They ARE Chinese chainsaws and I'm disappointed in Mac. Most mechanics won't touch them. We can provide no more help with this saw. Sorry I wasn't more helpful.
Poulan or Craftsman gasoline chainsaws are reasonably inexpensive, parts are available, and given a little TLC perform well.

Posted on Sep 21, 2009

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SOURCE: Need to remove & replace primer bulb on mcculloch mac 3516

There are 4 different IPLs for this saw. Fuel detail are on multiple illustrations.
A helpful video, a few of my suggestions, and a schematic follow:
Fuel Line Replacement by

  • The hose in the tank with the filter on the free end connects directly to the carburetor input connection.
  • If the saw is equipped with a primer bulb, an output line from the carburetor connects to the suction side of the primer (once the bulb is collapsed it draws fuel from the tank through the carburetor to refill as it inflates).
  • The pressure side of the primer returns displaced fuel to the tank as it is depressed.
Take lots of notes and a few digital photographs to help with reassembly.

Posted on Nov 16, 2009

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SOURCE: Mcculloch chainsaw. Model 2116av. Primer bulb is

Hello Jeff;
Your saw is listed here:
McCulloch MTD
Chainsaws 32cc-35cc-38cc Anti-Vibe
The IPL (exploded parts list) for your saw is the only detail for fuel line routing and it is sketchy at best; components are listed but may be on different illustrations. The primer is displayed but not listed, and there is no part number. Before you get to deep please contact OrderTree.

Use the IPL as a guide for disassembly/reassembly.
This is typical routing and a couple of hints.

OMs for McCulloch are tough. harder than replacing the fuel line. Have your saw within easy reach they will want the serial number and a few other things.
Operators Manuals: are much more difficult. I have dialed this number many times (Contact Us - All McCulloch Products 1 (800) 521-8559) and have yet to get a satisfactory response. Please try this! If enough of us try they will fix it! If unsuccessful with McCulloch try here:
Beg for manuals thread (ArboristSite - free to join). Please use the search function first, it has probably been asked and answered.
Good luck with your project. HTH

Posted on Feb 20, 2010

  • 2220 Answers

SOURCE: Poulan chainsaw primer bulb replacement

Hello Jay;
The primer listed for your saw and sold by Poulan does not include hoses (do an Internet search for the part number below, there are photos). Hoses are sold separately and are 2 different sizes. You can cap the carburetor to primer connection at the carburetor and your saw will run as all chainsaws did before the addition of the air purge system.

An example of a Poulan "2375LE Gas saw Type 2" follows (may not be your saw):
The IPL (exploded parts list) for your saw is the only detail for fuel line routing and it is sketchy at best; components are listed but may be on different illustrations.
See the "Engine Assembly" print; item 4; pn 530047213.
Small hose in the tank with a filter on the end (long enough to reach all corners as the saw is moved) the opposite end connects to the carburetor.

A second small hose connects between the second carburetor fitting and the suction side of the primer.
A large hose connects between the pressure side of the primer and fuel tank (return).
I suggest you replace ALL hoses. Do you change tires on at a time?

Plumb the system EXACTLY as the diagram shows. If it will not run you have the 2 connections on the carburetor reversed. It might make sense to leave them long enough to swap until everything is working.
A typical fuel system and a couple of suggestions can be found here:

If your saw is not a Type 2 or an LE (code for Wild Thing) you can find the correct IPL here:
The dash number of your serial number is the type.

If you have more questions or need additional help please reply below and I will get back to you. Thank you for using FixYa and Good Luck. HTH

Posted on Mar 15, 2010

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