Fuel squirting of tank vent one purge bulb pressed.

[Hunter]

 

I need some help please.

I have changed fuel line in my husky 135 but now when I press purge bulb fuel comes out of tank vent. I have changed tank vent with new one and still having same problem.

Also pressing purge bulb several times building positive pressure in fuel tank, once tank cover unscrewed you can hear pressure released.

I thought I may have mixed the fuel lines but they seems ok.

One line on right side rink from tank to right side of carb.

Others long line run from tank to upper connector in purge bulb and finally one Sam line from purge bulb to left side of carb.

What I am doing wrong?

Saw fires first pull but would not run.

 

 

[Hunter]

Here is picture

[openspaceman]

56 minutes ago, Hunter said:

Also pressing purge bulb several times building positive pressure in fuel tank, once tank cover unscrewed you can hear pressure released.

I recently had this problem and still haven't entirely solved it on a Stihl ms181c. The main thing is the purge bulb was sucking air through a split fuel pipe. Thus air was sucked into the bulb and when it was pressed it was being pushed into the tank.

[Hunter]

I see. Fuel line is new and no splits

[Hunter]

I have checked fuel snd return line and they are in correct order connection wise.

When I did change fuel line I ask cleaned and put new kit in carb and pretty shore it was put on right order, done this few times before. Purge bulb got fuel in it but only small amount.

[adw]

Just to clarify, there are two connections on the purge, the long one is the pressure side so back to tank, the short connection is suction so goes to the carb, purging will create an amount of pressure in the tank, I have never seen one blow fuel from the breather, you should be able to at least 3/4 fill the bulb, biggest issue with this generation of machines  135/140/435 is ignition unit failures.

[Hunter]

36 minutes ago, adw said:

Just to clarify, there are two connections on the purge, the long one is the pressure side so back to tank, the short connection is suction so goes to the carb, purging will create an amount of pressure in the tank, I have never seen one blow fuel from the breather, you should be able to at least 3/4 fill the bulb, biggest issue with this generation of machines  135/140/435 is ignition unit failures.

Thanks, yes all fuel line in right order.

I think problem should be in carb sucking fuel from tank, which lead to high pressure on tank and fuel has to place to go except tank vent. I guess  I may have to take the carb out and see

[adw]

I still think you have an ignition unit problem as well, firing  once and not starting are fairly common symptoms of a bad unit.

[peatff]

It sounds like the one way valve in the primer is faulty, just try blanking the pipe off or replace it they are cheap enough. Carb sucking fuel from the tank would create a vacuum not pressurise it.

[spudulike]

It would help if you stated why you fitted a new carb kit and purge bulb. If the saw was a non runner then ADW is probably correct.

It is possible you have installed the carb kit incorrectly or even fitted one with the purge holes missing. The purge should suck  on one side and blow on the other. Easy to test with a short length of pipe and a cup of fuel.