809117565 bulb primer not priming

https://www.partstree.com/models/440-e-husqvarna-chainsaw-2008-05/

The link shows components of the saw.

Three fuel lines...

1. Fuel tank dip tube (fuel filter) to siphon side of primer bulb


2. Primer output to carb in.


3. Fuel return to tank.


Likely you have reversed the primed bulb lines.
Disconnect the line from the primer bulb to the carb. If you have the correct connection from the tank to the primer bulb, fuel will spurt out the bulb as you press the bulb

If no fuel, move the line at the primer bulb to the other primer connection. Press primer bulb a few times and fuel should spurt out bulb.

If still no fuel then a problem with the fuel tank dip tube or plugged filter

a primer bulb should not actually fill, that said, if it is not priming your carb then there might be a tiny crack or pin hole that is letting air in as you try to prime, order and change the primer bulb.

Knowing the make and model will help. Some saws have a primer bulb that will suck the fuel through the carb to prime it.

If this is the case, here is the sequence: Fuel line from tank goes to the (fuel in) side of the carb. The (fuel out) side of the carb goes to the primer bulb the (suction side) The (blowing side) of the primer goes to the return to tank.


So when the primer is pumped it pulls fuel into the carb to prime it and any over priming gets returned back to the tank.

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sounds like you hasve a cracked fuel line or a cracked primer bulb. that is why it cant prime.

Probably a valve in the priming system is stuck. It allows fuel to flow into the bulb from the tank, the valve should close then and allow the bulb pressure to spray into the carburetor. Could also be the opening into the carburetor from the prime bulb is blocked.

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.

If its identical it should work ,if not take the old one to a mower shop,to get correct one and make sure the choke is going right on when the cable is in choke position.

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

I would recheck the carburetor to make sure you put the diaphragms next to the carburetor and not the gaskets.
Please if it is not priming you may have the fuel lines hooked up wrong. Also check the fuel cap to make sure the vent assembly is there. If the tank is not venting, the tank will get a vacuum in it not allowing fuel to flow.
HTH
Good Day.

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.