Question about Troy-Bilt TB146 EC 4-Cycle Garden Cultivator

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Which fuel line is the intake line at the carburetor?

There is a vague answer posted here that says the line to the primer is the return line. Which line goes to the primer on the carburetor? Is it the line nearest the bulb or farthest from the bulb?

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The fuel line goes:

  1. From the filter in the tank to the carb, usually the bottom most connector.
  2. From the carb to the Primer. The tube in the center of the primer bulb.
  3. From the primer, outer tube to the fuel tank.
Get the manual online from Troy-bilt herehttp://www.troybilt.com/equipment/troybilt/tb146-ec-4-cycle-garden-cultivator

j

Posted on Jul 04, 2014

Testimonial: "What Jay said. Got new hoses from Lowe's that supposedly won't rot off this winter. The machine ran good."

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2 fuel lines broke (1 from tank 1 from primer bulb). Line from back of tank to back of carb still there. Which lines go where?


Do not mix them up!! Doing so will bring debris into carburetor. Assuming the line from back of tank to carburetor is the fuel feed line then you should also plan to replace it if the other lines have failed..

The primer bulb sucks (pulls) the air fuel through the carburetor thus venting out any air. The process draws the fuel through the in tank filter through the impulse fuel pump. The fuel connects via an internal carburetor passage from the pump to the needle valve and during the prime passes the needle valve into the pressure diaphragm chamber. From there the fuel is drawn(sucked) into the inlet side of the purge/prime valve and returns the air fuel into the tank.

The center hose on the primer is the return into the fuel tank. The hose from the center of the primer bulb goes directly to the fuel tank and is the return. The outer diameter hose connection to the primer is the connection made to the carburetor. By closing off the end of the hose you can test with your finger the function of each hose. You do not want to pass fuel into the carburetor by reversing the primer hoses.




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Need to change fuel line but there are 2 fuel lines in the tank. small and large both are connected to the carburetor.


This is normal. Usually the smaller line is the fuel pickup and larger one is the return. Most two cycle carburetor have primer to remove air from the carburetor. At some point excess fuel needs to returned to the fuel. Some carburetors have the primer bulb built in and other uses a remote primer.

The following is an example of the basic plumbing of the remote primer system. If your carburetor has the built in primer then just ignore the remote primer and the return line directly to the tank.


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Take the line off of the primer that goes to the tank and leave loose for a moment. The other line to the primer comes from the carburetor and it should be be tried on either port on the primer until it will pull fuel into itself when pumped. If neither port works, the primer pump may be faulty, the carburetor is plugged internally, or the fuel line from the tank to the carburetor is decayed or the fuel filter is plugged. When the primer pulls fuel into itself, reconnect the return line that goes back to the tank. Hope this helps!

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Leave both primer ports open, then attach the fuel line that feeds the carburetor from the fuel filter to one of the primer ports--pump the primer and if you guessed correctly, it should pump fuel into the primer bulb. That is the primer port that goes to the carburetor output connection. The other primer port connects to a short line that goes back into the fuel tank with no filter. Return the original feed line back to the upper carburetor port. Connect the open primer port to a short line that connects to the carburetor lower port. Be sure to use original rubber lines, not plastic. Hope this helps!

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I Need Diagram of Fuel Line Hookups For a Poulan 2075 Gas Chainsaw. I Have Two Lines Coming From Primer, Two Coming From Fuel Tank, and Two coming From Carburator.


The line at the rear of the fuel tank with the fuel filter is the main feed line to the carburetor and connects to the upper nipple. The lower nipple on the carburetor goes to one of the primer ports, and the other primer port goes back to the tank, which has no filter on the tank end. On the primer port, it is cut and try--remove the tank return connection and leave loose. Place the main fuel line on to one of the primer ports and try to pump fuel into it with several pumps.Make sure the filter in the tank is not plugged. If nothing, shift the line to the other port of the primer and try pumping again. When successful, remove the main fuel line and return it to the upper carburetor port. Run a new line from the lower carburetor port to the active primer port and try to pump fuel again. If it won't pump fuel, reverse the two connections at the carburetor and try to pump again. If still nothing, there is trouble within the carburetor which should be cleaned with spray carburetor cleaner and maybe re-kitted. When you can finally pump fuel through the carburetor, then attach the tank return line to the open port on the primer bulb. Hope fully, the engine should run at this point. Hope this helps!

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The line at the back of the tank gets the filter (check it for plugging) and the one nearest the cap doesn't use a filter (it is the return line from the primer bulb). The filtered line goes directly to the carburetor inlet port and the outlet port allows fuel to be pulled through the carburetor and out to the primer port. Check and replace any fuel lines that are in poor condition. If the engine has been running with the intake filter missing, the interior of the carburetor may be full of debris. Remove, dismantle, and clean the carburetor interior. Go to: http://www.drystacked.com for an excellent 12 page article on Walbro carburetor theory and troubleshooting. Hope this helps!

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If the saw has a primer bulb, then you require one line from it's output out to the tank return. Another line runs from the carburetor outlet to the primer inlet. Make sure that you use original rubber lines, not plastic replacements. The primer ports are found by trial and error--hook the filtered line directly to one primer port and leave the other port open. If the bulb is in good condition, and correctly connected to fuel, the bulb should fill with fuel after several pumps. If nothing, reverse the port connection at the primer--and pump test again. One of these two connections should allow pumping to occur. When you get pumping, install the tank return line to the empty primer port. Remove the filtered line from the primer and install on the carburetor. A new piece of line runs from the now empty primer port and connects to the output port on the carburetor. If the carburetor lines are correct, you should be able to pump fuel through the carburetor body and out to the primer bulb. If nothing happens, you may need to swap the carburetor lines, and you will likely need to service the carburetor. Hope this helps!

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1 Answer

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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, 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.
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The line with the filter needs to be long enough to reach all parts of the tank as the saw is moved, a little to long is probably better than to short. The line returning from the primer is not critical so long as it cannot fall out (mid tank). All the primer line does is return excess fuel to the tank. Does this answer your question?
HTH
Lou

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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, the output line from the carburetor connects to the suction side of the primer bulb (once bulb is collapsed it draws fuel from the tank through the carburetor to refill the bulb as the bulb refills).
  • The pressure side of the primer returns any excess fuel to the tank as it is depressed.
HTH
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This is much easier than you think; the carburetor has two ports, one supply one return, the return port is the top port which allows excess fuel to be returned to the fuel tank when pressing the primer bulb. The bottom port is the intake that supplies fuel to the carburetor to be mixed with air and pushed into the cylinder for the combustion cycle. Both lines connect to the tank, the line with a cylindrical looking object is the supply line, that object is the fuel filter, so it would be connected to the bottom port of the carburetor. I hope that helps.

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