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Routring fuel lines

Schmatic for walbro mod- Wt347 carb.?

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Try this link

They may be able to give you assistance or put you in contact with manufacturers.
Hope this helps


Posted on Nov 14, 2008

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No fuel to carb

You rebuilt the carb? could the metering diaphragm be installed upside down? (THE ONE WITH THE DISC) or could it be the lever connected to the needle isn't set to correct height? Zama and Walbro have great web sites. one more thing are you sure you put the fuel lines (2) on the right spot?? one line goes to the filter the other is simply a return and only goes in the tank but not too deep into the fuel

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I have a walbro carb on a craftsman chainsaw..Can you tell me which fittting on the carb (TOP RIGHT) OR (BOTTOM LEFT) gets the fuel line with the filter on it??

All chainsaw primers pull fuel from the carb, so the fuel inlet ( pipe with filter on the end ) goes to the connection nearest to the pump cover of the carb ( the alloy cover with a single central screw )

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Fuel line placement on the walbro wt 673 carb

This is superb, the one I'm trying to fix has been piped up wrong, the primer bul is pushing the fuel through the carb.

It will start and idle, but when ypu open the throttle it dies, from lack of fuel.

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1 Answer

My Poulan 2025 Chainsaw fuel hoses have broke down and fell apart. I have new fuel line but do not know the hose routing. All I found in the tank was pieces of hose and the filter. Only one hole coming out...

Check out and there is a video on there you can watch that talks about fuel line replacement. It is a very helpful video Tom. Good luck

Aug 07, 2011 | Poulan Pro Chain Saw 46cc 20"

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Where does the fuel line from tank with filter fit on walbro carb.also where does the primer line go?

The fuel line from the tank fits to the main fuel inlet on the carb ( the inlet nearest to the alloy pump cover secured by a single screw), the other conection on the carb has a pipe that conects to the shortest conection on the back of the primer ( suction side ) a pipe then goes from the longer conection on the primer ( pressure side ) back to the tank, it just pushes into the top of the tank.
So to recap the primer pulls fuel from the carb, and dumps it back into the tank.

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Need diagram of fuel lines from tank to primer bulb and carburator on a Poland chainsaw model 1950 wood shark

There are 7 different types of the 1950 model (types 1 - 7) and it came with one of these 2 carbs Walbro or Zama. The carbs are different as are the fuel line connections for each one.
Although this video is for the promer bulb you can see the routing of the fuel lines.

You will have one line from the fuel tank connecting to primer bulb the 2nd line going to the carb. If you connect it backward it does not pump fuel into the carb.

(FYI Types 1 - 5 all have the same fuel line routing.)

Apr 12, 2011 | Poulan Pro 14" Gas Chainsaw 33CC P3314

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Fuel lines rotted off of my McCulloch 4600 chain saw

Go to: for a 12 page article on Walbro brand carburetor theory and troubleshooting. Hope this helps!

May 18, 2010 | McCulloch Garden

1 Answer

I have a small poulan micro chainsaw with a walbro wa19

I am going to close this. We can continue to converse as we have.
I present you with these parting gifts (look at the 1800 and 2000s):
The dash number of your serial number is the type.

Just in case
Fuel Line Replacement by
Good Luck.

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1 Answer

I have a walbro WT349 on a mac cat 38cc. chainsaw

Leave the hoses a little long an try it. Logic says the uppermost carburetor connection goes to the priver bulb, but you and I both know logic does not always work.

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.
McCulloch IPLs (600160) You provide the prefix and suffix.

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