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How to replace primer bulb abd fuel lines on engine

Fuel lines and primer bulb dryed out and cracked need to replace it and how do the fuel lines run

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Posted on Jan 02, 2017

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SOURCE: 323L Husqvarna trimmer

This sounds like the carb needs to be adjusted like it is letting to much fuel into the cylinder. There is supposed to be fuel and air mixture in the cylinder to make it fire. If there is to much fuel what will happen is that it will just build up in there and the air wont get hot enough as it compresses to start the engine.

Posted on May 21, 2009

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SOURCE: runs only via primer bulb

You definitely have a fuel problem. But you will have to take the carburetor off and disassemble it. As far as other carburetor parts failing; yes , but it's probably do to old age or much use. You should first take the carb. apart and clean the all ports with a Den Tek Brush, (used for cleaning teeth), they work great for this job. The smallest particle's can keep the carb. from operating properly. Also, check for a small screen that filters the fuel. It sets down in a larger port. It can get clogged as well, or even blocked completely. If after you have done all of this and it still doesn't work, you will need to purchase a carburetor kit for unit. It will come with various gaskets, a screen, and a needle valve. this should definitely solve your problem. You will also want to change your air filter, (if you haven't already), because if it is old and dry rotted, pieces of the filter can get sucked into the carb. that you just spent an hour or so cleaning. You will then have to disassemble carb. and clean again, NOW THAT WOULD STINK!!
Good luck.

Posted on May 25, 2009

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SOURCE: primer bulb won't prime

it sounds like the filter on the fule line is cloged try to remove the filter and then try to prime the trimmer. it it does you need to replace the filter. just about any filter that will fit will do.

Posted on Jun 10, 2009

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SOURCE: the primer bulb does not draw fuel thru carb

you need to buy a primer bulb kit and replace it cost about $8.00 and is easy to put in, the check valve is damaged.

Posted on Jul 18, 2009

  • 134 Answers

SOURCE: primer bulb only holds suction, wont move fuel thru line

By "holds suction" this means that you can depress the primer bulb and it remains in the "pressed" position and/or does not reinflate (for lack of a better term)?

You need to determine if a blockage exists in either one of the fuel lines, or with the primer bulb itself.

First, drain your fuel tank. Do this into a clear mason jar or equivalent and inspect your fuel to see if it is full of debris since even very small pieces of grass, dust, dirt, etc... can cause problems. If so, then you need to flush your fuel tank and or lines.

Viewing the backside of the primer bulb, you can see several clear fuel tubing lines that lead from the primer to the carbureator and fuel tank..

Next, carefully remove these using a pair of needle nosed pliers (or by hand is at all possible) being very careful not to crush or tear the tubing.

With the clear tubing removed, if the primer bulb will press in and immediately reinflates back to it's relaxed position, then one or more of your lines are clogged by a small piece of debris. If the primer still does not relax, then it is blocked by a small piece of debris or needs to be replaced (pick one up at Lowes, etc...).

If you determine that your lines may be clogged, then I have had success clearing them with a can of WD-40 by sticking the red nozzle into the clear tubing (attempt to make a seal) and by pressing for a half-second or so. If you get flow, then let it rip for a second, then proceed to rinse your fuel tank again just for good measure (basically until you get nothing but clean debris).

Put it all back together and let it rip!

Posted on Jul 19, 2009

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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

My Ryobi 4 cyl 30cc leaf blower just quit starting. Has always started perfectly, but now it just wont start.

replace spark plug.if spark plug okay problem could be carburetor or air leak at fuel lines or check primer bulb for crack which cause air leak.any breaks in fuel line or primer bulb cause air leaks fuel system cause carb not get fuel run engine.

Sep 20, 2013 | Ryobi 30 Cubic Centimeter Curved Shaft Gas...

1 Answer

My Craftsman 17cc gas weed trimmer wouldn't start.

Hi There, Check the primer bulb for tare or pin holes. Replace it. Check and clean carb jet it maybe plugged with debree. Also check for spark which you didn't say. Replace with correct plug.
Note; Do not use strong cleaners on rubber seals (O rings and gaskets) They dry up and crack.
If needed use a dabble of grease on seals

Jun 13, 2011 | Craftsman 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

1 Answer

All of the fuel lines have broken due to age and now I do not have a good idea how to replace with new lines

In general, a fuel line runs from the fuel filter in the tank (check the filter for plugging) up to the carburetor inlet port (usually upper-most). The lower carburetor port goes to the inlet of the primer pump. Leave the other primer port open for the moment. With fresh fuel mix in the tank, try to pump fuel into the primer bulb--if nothing happens, move the line to the open port and see if it will pump. If neither one works, the filter is plugged, the carburetor is internally plugged, or the primer bulb is cracked or has a hole in it. Be sure to use original type fuel lines--not plastic. Once you have the primer bulb filling with fuel, install a fuel return line from the open primer port back into the tank through another hole. The engine should be ready to start at this point. Hope this helps!

Dec 28, 2010 | Garden

1 Answer

Fuel line keeps stallingoit after a few seconds

By your question, I assume that the fuel line runs dry after the engine runs a few seconds. The first thing to check is for a plugged fuel filter in the tank and the condition of the connecting fuel lines for rot, hardness, or cracking. If the machine has a primer bulb, does it pump fuel into it after several pumps? Remove the line from the primer that goes back to the tank to make sure it is pumping fuel from the carburetor only. If you replaced any lines, they may have been reconnected incorrectly. Hope this answers your question!

Apr 21, 2010 | Garden

1 Answer

Fuel line crack dry out, in pieces

The IPL (exploded parts list) for your saw is the only detail for fuel line routing and it is sketchy at best. Find your saw here:

Fuel Line Replacement
Routing runs from fuel tank to carburetor, (if equipped) through carburetor to primer bulb, bulb returns excess to fuel tank.

I think the second line on the carburetor is an impulse line and connects to the crank case. HTH

Oct 08, 2009 | Poulan Pro 42CC 2 Cycle Chainsaw, 18"

1 Answer

Craftsman edger won't start

Does it have a primer bulb? If so, make sure the bulb is not cracked. Also, make sure the fuel lines are not cracked and the fuel supply line reaches the bottom of the tank. Fuel lines, as silly as it sounds, degrade when exposed to gas for long periods of time. If they are cracked it will draw more air than fuel and not allow the engine to run. You can buy replacement fuel line/primer bulb kits for under $10 at practically any hardware store.

May 24, 2009 | Craftsman Gas Mini - Tiller/Edger

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