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Changing leave blower fuel lines

I thiink I switched the fuel lines while changing the carb and I wanted to now which line is the fuel input and where should it be connected to the carb

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The one with the biggest outside diameter is the supply and would go on the top pipe of the carb, I think. Good luck...Lee

P.S. It can only go one way or the other.

Posted on Nov 14, 2009


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If you have primer unable to pull fuel into the motor it maybe one of two things.....a blocked fuel inlet in the carb or the fuel lines are backwards! Try swapping the fuel lines and see if anything changes. If nothing improves you will need to remove the carb and clean it out. Do not use compressed air! Use a can of carb cleaner and allow to air dry afterwards. If you can remove the fuel screen that might help too. A carb kit will come with a new one. The whole carb from eReplacmentparts is less than 30 bucks. Which is a real timesaver!

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How to change fuel line on craftsman blower

Before you start take a picture of where the old lines are connected to the carb and the primer bulb for future reference.
To replace the line pull the spark plug wire from the plug. Remove the old line from the tank and remove the fuel filter from the line. Take new larger line and cut it on a 45 degree angle/or trim as necessary so you can grip it from inside the tank and pull it into the tank. Perform the same operation on the smaller line as well. Be sure to leave enough line for the fuel filter to reach the bottom of the tank. Install the fuel filter. The other small line is a vent line and only needs to come inside the tank not go to the bottom in the fuel.
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Hello Brian,
I would visually inspect fuel lines entering/leaving tank that go to the carb. These tend to get brittle and crack. Also, some models have a rubber grommet that the fuel lines pass through entering/leaving the tank, these too get brittle and crack. If that looks good, you may have a stuck needle in carburetor and it will need to be removed and serviced. Hope this helps. Good luck and happy wrenching!

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Fuel bulb will not pump

A few things can cause this. Clogged screen in carb and rotten fuel lines are the most common causes. Look inside the fuel tank. If the fuel line is stiff or discolored or if the filter has fallen off its time to replace the fuel lines. Check the fuel pump side of the carb and check the screen to see if its clogged. If the primer bulb is discolored ( any color but clear) its time to replace it. I suggest that if any one of these conditions exist to do it all at once... if the fuel lines are bad then the diaphrams are stiff, etc. Rebuild the carb and replace the fuel lines and primer bulb at the same time.
If you have just had any of the fuel lines off and the primer bulb wont pump then its possible the lines are reversed. If the primer is seperate from the carb; on the primer bulb there are two spigots, one short, and one long. The long one is output and goes to the tank, the short one is input and draws from the carb.

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1 Answer

I received an answer for a 25cc gas trimmer, however, my problem was with a Craftsman 32cc Gas Blower. I need to know where all the three gas lines go??

The routing of the fuel lines is the same. If you have 3 lines, that means the primer bulb is not directly mounted to the carb, rather it is connected to the carb with hoses.

Line 1. Comes from the fuel filter in the tank (smaller diameter hose) directly to the inlet port on the carb. This is the port that is opposite the diaphragm on the carb. Diaphragm is held on with 2 or 4 screws through a chrome plate. Make sure to leave enough hose so the fuel filter will fall to the lowest point of the tank when it is being used.

Line 2. Goes from the other port on the carb to the short side of the primer assembly.

Line 3. Goes from the longer port of the primer assembly and returns to the tank. Sometimes this line will have a simple coupler on the inside of the tank, but it is optional and its only function is to keep the line from slipping out. If yours does not have this coupler, just leave an inch or two of line in the tank.

*If both ports on the primer are the same length, you can test to see which is pushing air out...that's where line 3 goes.

Good luck!

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1 Answer

Replaced gas tank and primer bulb on my Poulan Leafblower FL1500 and it appears I'm not getting gas into the carb. Any ideas as to what my be the cause?

I assume the new tank came with new fuel lines and filter in it.
First be sure you have all the lines hooked up correctly. There should be a main line from the tank ( has the fuel line on the end of it in the tank) to the fuel pump side of the carb. Then there should be a line leaving the metering side of the carb to the primer bulb then from the primer bulb returning to the tank. When you press the primer bulb you should see it **** the fuel into the carb then from the carb into the primer bulb then back into the tank.
If the fuel lines are all hooked up correctly then you should rebuild the carb.

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1 Answer

Where does the fuel line with filter go on the carb?

The longest, and sometimes smaller in diameter of the two fuel lines, goes from the carburetor to the bottom of the tank. Leave enough slack in this line so that the filter that attaches to the end will rest comfortably at the bottom of the tank.

The other fuel line goes from the primer bulb to just inside the tank, (about an inch). make sure that you get the right size fuel lines. The plastic coupling goes on the end of this line, inside the tank. This keeps the line from pulling out of the tank.

(HINT): When feeding the lines through the tank holes, cut the lines at an angle. They will feed much easier into the holes. You can than cut them off square, once you know that you have enough to work with.

If you need further assistance, just let me know.


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