Question about Craftsman 25cc Gas Line Trimmer

1 Answer

Need to know the fuel line routing including the primer bulb.

Hoses were too degraded for me to actually determine the pick-up from the primer to the carb sequence

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Craftsman Master
  • 1,545 Answers

The smaller diameter line (fuel supply) goes from the fuel tank (w/filter) to the carb body. Look carefully at the 2 nipples on the carb. You can tell one is slightly larger than the other. Another larger line (purge line) goes from carb body to the right nipple on the primer bulb. Another large line (return line) goes from the left nipple of the primer bulb into the fuel tank. completing the purge circuit. This info pertains to the Craftsman 32cc with Zama carb and may work on the 25cc model as well.

Posted on Jun 01, 2010

Testimonial: "local lawnmower shop told me wrong and I knew theoretically it wouldn't work The info gained here now makes sense of it all!"

  • Roy Cagle
    Roy Cagle Jun 13, 2010

    You may have to reverse the position of the 2 purge bulb lines as my info pertained to point of view with carb removed.

×

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Need to know fuel hose routes from fuel tank to carb


I will include routings for an on the carburetor purge bulb and a remote purge bulb.
The small diameter line out of fuel tank (has filter in-tank on end) connects directly to the side of the carburetor that has the fuel pump....that is the cover without the hole in it. Other larger diameter fuel line out of tank connects to the longer nipple on the external purge/primer bulb. The bulb "pulls" fresh fuel from the fuel tank to the carb and then out of the carb to itself, where it then "pushes" any air/old fuel back into the fuel tank. The remaining larger diameter fuel line in this setup goes from the metering chamber (has cover with writing on it and a vent-hole) side of the carburetor to the smaller nipple on the purge/primer bulb. Again, on the primer bulb, the longer nipple has a line going directly from it to the tank. This is the return line. The shorter nipple on the bub has a line from it going to the metering chamber side of the carb. If the purge/primer bulb is on top of the carb...small line from carb body to small hole in tank with filter. Larger diameter line goes from the bulb on the fuel pump side of the carb to the larger hole in the fuel tank where sometimes the line is held in place with a nylon nipple connector that keeps the line from pulling out of the tank. Otherwise, the line should enter the tank for about 1/2" or so.

Apr 29, 2011 | Mtd Garden

1 Answer

Walbro WT891 carb on a Craftsman chainsaw. Carb is brand new, all fuel lines and fule filter replaced. I prime the carb with the little plunger, chainsaw starts up and runs out of fuel within 30 seconds....


Who connected these hoses? the normal routing for a machine with a primer is like this, the fuel hose from the tank with the filter on the end goes to the carb fuel inlet nozzel ( not to the primer ) nearest to the pump cover ( cover on carb held with one screw ) the pipe from the metering side of the carb connects to the shorter nozzel on the primer bulb ( suction side ), the longer nozzel on the primer ( pressure side ) connects to the pipe going back to the tank, just remember the primer pulls fuel from the carb,into the bulb, and pushes it back into the tank, it is not actually a primer it is a purge. because it is connected this way it is impossible to flood the engine no matter how many times the bulb is pressed.
Let me know if it starts and runs.

Jan 31, 2011 | Poulan Garden

2 Answers

String trimmer, fuel lines disintegrated, I need routing.


The Walbro has two connections on it for the fuel line. My Walbro has one connection on the side of the idle screw and main fuel adjusting screw. This connection hooks up to the suction side of the primer bulb. Usually the shorter stem. (You actually **** fuel through the carb instead of pushing it through.) On the other side of the carb is the other hook up. It draws fuel from the tank. This line will connect to the side of the tank that has the filter. The other side of the tank is your return and it hooks to the other connection on the primer bulb. Usually the longer stem.

Apr 17, 2010 | Poulan 25cc 2-Cycle Gas Powered String...

1 Answer

Has Ryobi RCS 3535A chainsaw a fuel bulb priming


The numbers you supply don't cross to an operators manual but that is typical of Homelite/Ryobi. I'm going to make an educated guess that it does not have a primer system. Other Ryobi saws with primer systems include it in the specification. The 3535A does not. Close scrutiny reveals no primer.
IMO fuel primers on chainsaws are one more source of problems. In the USA ethanol additives attack fuel hoses. Without a primer routing is from the fuel tank directly to the carburetor and much simpler to replace. Primers on chainsaws operate differently than 4 cycle engines too. No fuel is injected into the carburetor or engine, its only purpose is to ensure the carburetor is full of fuel,
Typical Fuel hose routing:
  • 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.
bfe8bfa.gif
HTH
Lou

Nov 14, 2009 | Ryobi 18-inch Electric Chainsaw Chain Saws

2 Answers

McCulloch 3216 fuel primer and gas tubes routing?


fbb4e12.gif
Fuel Line Replacement by SmallEng.com
http://www.youtube.com/watch?v=JrXpU70Hmi0
  • 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, the 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 the bulb 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 will help with reassembly. HTH
Lou

Nov 01, 2009 | McCulloch Garden

1 Answer

I am replacing the fuel tank assy and purge bulb (i.e. primer) on my Sears Craftsman model 358.798940. The original plastic tubing was old and brittle and broke apart while disassembling, so I could not...


The order of fuel travel should be:
Fuel filter to fuel hose to Carb's Fuel Supply nipple. (On the main body of the carb)
Primer Plate Nipple on carb to fuel hose to Suction Nipple on Primer Bulb. (It must pull fuel thru the carb, not push)
Pressure Nipple on Primer Bulb to fuel hose to Fuel Tank Return hose.

When correctly installed, the fuel will be PRESSED into the fuel tank via the return hose when primer is pressed in . . . and SUCTIONED out of the tank and into the Carburetor when primer in released.

Hope this helps,
Dolf-

Oct 16, 2009 | Garden

1 Answer

I have a roybi 31cc weed eater and the fule line has become brittle and has broken apart. I need to know the layout of the new plastic fule line. I purchased a new fule line at Lowe's. I do not know wich...


STEP (1) The fuel supply line has the filter attached inside the fuel tank. The other end of that line goes on the carburetor's SUPPLY NIPPLE.

STEP (2) Determine the primer bulb's flow direction by pumping it under water. The unused nipple on the carb (IF STEP 1 WAS DONE CORRECTLY THERE IS ONE UNUSED NIPPLE STILL AVAILABLE ON THE CARB) will have a section of fuel line attached to it and running to the SUCTION NIPPLE (or pull-side, as some techs call it) of the primer bulb.

STEP(3) The final piece of fuel line goes from the OUTPUT NIPPLE (or push-side, as some techs call it) of the primer bulb and is routed back into the fuel tank as a return.

If plumbed properly, the primer should PULL fuel thru the carb and NOT pump any fuel into the engine. Excess fuel should be pumped back into the tank on each and every press of the primer.

Hope this helps!

Sep 28, 2009 | Garden

2 Answers

Fails to stay running / primer bulb does not fill


Double check that the fuel lines are routed properly. Another place to look for a potential problem is where the fuel line comes out of the tank. Make sure the hose is not pinched. The typical fuel line routing is the first line (the one with the fuel filter in the end of it) comes out of the tank and goes to the bottom fitting on the carburator. The second line comes out of the tank and goes to the bottom fitting on the primer bulb and the third line goes from top fitting on primer bulb to top fitting on carburator. Hope this helped and best wishes.

Sep 04, 2009 | Ryobi 30 Cubic Centimeter Curved Shaft Gas...

2 Answers

Fuel hose routing problem on a Mac 3200 Chainsaw


This post helped me with my McCulloch Mac 3216 chainsaw. There are two holes in the gas tank - one above the other. One is for the gas line (with the filter on the end) and the other is for the overflow - a simply line that runs from the "out" nipple on the primer bulb into the gas tank. The filtered fuel line goes to the nipple on the back of the carb. Another short line goes from the "in" nipple on the primer bulb to the nipple on the front of the carb.

There are two notches just out from the two holes in the gas tank for holding the lines that go in -- this may help you locate the holes.

I found it helpful to pull the lines that go into the gas tank out through the gas cap hole and leave them hanging out until the housing was reassembled. I also left the lines that plug into the primer bulb hanging out through the hole where the bulb goes until the housing was put back on. Leave plenty of extra line for the lines going out to the primer bulb. Once the housing is in place, cut the lines to the primer bulb and attach them, and slip the lines into the tank, making sure the ends are as far down in the tank as possible. You will need this extra "slack" to work with the housing to get it back on.

May 30, 2009 | McCulloch Garden

2 Answers

Fuel hose routing problem on a Mac 3516 Chainsaw


chainsaw fuel line routing for my mac 3516

May 20, 2009 | Garden

Not finding what you are looking for?
Craftsman 25cc Gas Line Trimmer Logo

2,360 people viewed this question

Ask a Question

Usually answered in minutes!

Top Craftsman Garden Experts

Dean Gruber

Level 2 Expert

110 Answers

Roland W VanLue
Roland W VanLue

Level 3 Expert

486 Answers

Dennis Key
Dennis Key

Level 3 Expert

2475 Answers

Are you a Craftsman Garden Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...