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Fuel leak from primer bulb hose/not connected

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  • dontbother10
    dontbother10 May 11, 2010

    Go here: HusqvarnaUSA.comhttp://www.husqvarna.com/us/homeowner/su... Uncheck "Manuals"; Check "Illustrated parts lists"; Type the 3 digit model number from the manufacturer's tag in the "Enter Product" window.; Open the IPL that corresponds to the manufacturer's serial number; Find all drawings that contain fuel system components. Take extensive notes and a few digital pictures will be helpful. HTH Lou

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Go here:
HusqvarnaUSA.com
http://www.husqvarna.com/us/homeowner/support/download-manuals/
1. Uncheck "Manuals";
2. Check "Illustrated parts lists";
3. Type the 3 digit model number from the manufacturer's tag in the "Enter Product" window;
4. Open the IPL that corresponds to the manufacturer's serial number;
5. Find all drawings that contain fuel system components.
Take extensive notes and a few digital pictures will be helpful. HTH
Lou

Posted on Sep 28, 2009

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Posted on Jan 02, 2017

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dontbother10
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SOURCE: McCulloch 3216 fuel primer and gas tubes routing?

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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, 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

Posted on Nov 01, 2009

  • 4088 Answers

SOURCE: primer bulb hook up

Two lines come from the tank--one with a filter that goes to the carburetor, another with no filter which goes to the output side of the primer bulb and passes pumped fuel back to the tank. Connect only the line with the filter on the end to the primer and pump it. If nothing happens, switch the line to the other port on the bulb and pump again. With fuel mix in the tank, one of these two ports should pull fuel into the bulb. When correct, put the filter-less line on the other port of the bulb. Remove the filtered line from the bulb and hook it to the upper fuel connection on the carburetor. Use another length of fuel line to connect the now open port of the bulb to the other port on the carburetor. If the connections on the carburetor are correct, fuel will fill the bulb after a few pumps. If nothing happens, reverse the two connections at the carburetor and try to pump again. You should see fuel enter the bulb with only the correct connections at the carburetor. Usually, these connections are unidentified and must be found by trial and error. This is also a good reason for replacing only one line at a time! When fuel pumps into the bulb, attempt to start--with luck, the engine will run. Once the engine runs normally, trim the line lengths so that you have no excess line, but don't have sharp bends in any line either--they will eventually kink! Hope this helps!

Posted on May 05, 2010

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Carburetor leaks fuel in the combustion chamber and out through the area of the throttle plate into the air filter.This happened after I had to replace the fuel lines .


This is not as easy as it appears!
The image below is the proper routing for the fuel lines from the tank through the primer and carburetor.

It is so easy to assemble this backwards and pump unfiltered fuel through the carburetor. Or Assemble it so that the primer pushes fuel into the carburetor.

The primer pulls the fuel through the filter located in the tank up the inlet hose into the carburetor internal fuel pump filling up the carburetor and purging out any air. The output of the primer returns any excess fuel back into the tank via the return hose.

26117870-p2kvwqjbo3oi50ps2xua1eg1-2-0.gif The center connection at the primer bulb is the output return to the tank and the off center connection at the primer bulb is the inlet from the carburetor.

26117870-p2kvwqjbo3oi50ps2xua1eg1-2-2.png If it is correct you need to perform a leak check on the fuel system. Reach into the tank and retrieve the fuel filter attached to the hose. Carefully remove the filter from the hose and with your finger over the end of the hose pump the primer. You should hold a vacuum. If the primer will not stay down air is leaking into the fuel system. Any air will disable the engine from running. The carburetor needs to be air free to function.

If air is not leaking from a hose connection and is internal to the carburetor it is likely that contamination has logged either in the needle valve or check valve.
Below is the check valve that prevents air from entering the fuel passages from the fuel jets when you prime/purge the carburetor with the primer bulb.
26117870-p2kvwqjbo3oi50ps2xua1eg1-2-5.jpg

If the carburetor is filling with fuel when you prime it is likely that the the primer is pushing (incorrect hose routing) the fuel into the carburetor through the impulse pump and through this check valve. Correct pluming and try again.

The needle valve is located under the four screws under the diaphragm and is actuated by the diaphragm.

Cleaning the check valve is almost impossible. Most have a rubber washer that can easily be moved out of place from the use of excessive air pressure. The claim is that the check valve can be replaced. I've never been successful and ended up replacing the carburetor. Messing with the needle and diaphragm has not always resulted Joy either. You can leak check the needle valve by plugging the inlet hose and pull the fuel out the primer bulb connection using the primer bulb. Cleaning the carburetor with the small holes and blind fuel passages can create a problem by plugging the tiny fuel feed holes you are trying to clean.. In the newer machine the adjustment screws are not removable preventing the cleaning of the needle clearances. This is a bumpy road well traveled by many!!
Hope this has been a help?

Mar 04, 2016 | Poulan Pro Gas Chainsaw 18" Guide Bar 42cc...

1 Answer

It does not start


During maintenance or replacement of the hoses it is easy to swap the hose connections at the primer. The center connection from the primer connects to the return hose that connects into the tank. The feed from the carburetor connects to the side connection of the primer bulb.

If the tank is full it can fool you as you prime because the return line to the tank that is full can be a pickup of unfiltered fuel and bring debris and air into the carburetor.

The primer pulls the fuel through the carburetor purging the air out. Usually seven strokes are recommended. You can observe through the primer bulb the air as it is purged resulting in no air left in the primer or carburetor..

Dec 22, 2015 | Poulan Garden

1 Answer

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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Dec 06, 2015 | Garden

2 Answers

My prime bulb looses pressure and first start is hard. I have to remove fuel line from filter and cover with thumb prime re install then first start takes time.


Does the engine run fine after it starts? Most common problem with primer bulb losing prime is an air leak in the fuel line or primer bulb. Air leaks don't always leak fuel. If there is an air leak between the primer bulb and gas tank there is no pressure, only vacuum. If it is not a major leak it might not leak without pressure but it will allow air to enter the fuel line. If it is a very minor air leak it could allow air to replace the liquid in the fuel line over time, but so little air once it is primer again that the fuel pump can over come it with volume of fuel.

Primer bulbs do not stay firm, as they are when initially pumped up, after the engine is running. There are check valves in the primer bulb that hold pressure in the primer bulb and throughout the fuel line to the engine. Once the engine starts the fuel pump creates vacuum drawing fuel into the engine diminishing this pressure and releasing the check valves. At this point the primer bulb is just another segment of fuel hose allowing fuel to pass through it as the fuel pump demands. The primer bulb functions much better when the outlet side is higher than the inlet side. This position makes it easier for the check valves in the primer bulb to seat and release as needed. If the primer bulb is functioning properly and is positioned with the outlet side higher than the inlet it should not be necessary to cover the end of the fuel hose with your thumb to get it to prime.

If the engine is hard to start after being fully primed there could be a problem with the fuel system on the engine. Some engines are hard to prime once air has entered the system, especially fuel injected models.

Dec 19, 2014 | Boating

1 Answer

Poulan Woodshark 1950 14" Chainsaw Family: WPWES


Checked all the parts lists, they seem to use the same primer through all types no.s part no. 530047213.

Jun 24, 2011 | Poulan 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

My chain saw 14" homelite


primers pull fuel from the carb and dumps it back into the tank, so if the bulb will not prime the chances are the fuel filter in the tank is blocked, pull the fuel hose through the filer hole and replace the filter on the end.

Jan 27, 2011 | Garden

1 Answer

Fuel leaks bulb not priming.


If you have a leak the bulb will not prime. Over time the either the rubber on the primer bulb gets a pin hole in it requiring bulb replacement or one of the fuel lines cracks and introduces air into the lines. Unless the system is completely sealed the primer bulb will not work. Make sure all of the connections on the fuel lines are tight and correct the system leaks.

Thanks for choosing FixYa.

Kelly

Aug 27, 2010 | Ryobi Snap In Primer Bulb Pump 683974 ...

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

I have a poulan 2150 chainsaw. I replaced the


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
Lou

Oct 25, 2009 | Poulan Pro 16-Inch 38 cc Anti-Vibration...

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