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Poulan bvm200 only starts when primed

#1

U

unit91

Runs until primer gas runs out.


#2

StarTech

StarTech

Then most like the carburetor will need cleaning and a repair kit installed. Several different carburetors were used and you other parts selections will on its type number which is the ending - part of the serial number. 1-4 types.

Also there is 11 different versions of the blower so make you use the model number from the serial number tag.


#3

U

unit91

StarTech said:
Then most like the carburetor will need cleaning and a repair kit installed. Several different carburetors were used and you other parts selections will on its type number which is the ending - part of the serial number. 1-4 types.

Also there is 11 different versions of the blower so make you use the model number from the serial number tag.
Click to expand...
Thanks. Let me see if I understand how this works: when I push the bulb gas goes into the tank, when I release the bulb gas is sucked from the tank into the carb. That correct?


#4

U

unit91

unit91 said:
Thanks. Let me see if I understand how this works: when I push the bulb gas goes into the tank, when I release the bulb gas is sucked from the tank into the carb. That correct?
Click to expand...
Gas not going into carb.


#5

StarTech

StarTech

Okay the best I can tell is that have the carburetor mounted primer setup. Both Walbro and Zama carb mount primer basically work the same.
1676147826420.png

Now if you reverse the fuel lines at the carburetor then the above system will not work. Also the internal filter screen over the metering needle is plugged fuel will not flow. Both Walbro and Zama carburetors used two different version of these filter screens. One you visually check and one that is impossible to visually check. The latter can clog and still look clean on the surface.


#6

U

unit91

Ok. Now, when I hold the blower in any position but level, it continues to run. If I hold it level it runs for a few seconds then slows down and stops.


#7

B

bertsmobile1

I am not totally sure that you have a fuel problem
And the first step in a diagnosis it isolating fuel from ignition.
So slip the kill wire off the coil and tape it out of the way
If the problem remains then you do have a fuel problem
If it goes away you have an ignition problem
Blowers tend to suffer more from kill switch failures than any other hand held .


#8

U

unit91

Thanks....I'll give it a try.


#9

U

unit91

bertsmobile1 said:
I am not totally sure that you have a fuel problem
And the first step in a diagnosis it isolating fuel from ignition.
So slip the kill wire off the coil and tape it out of the way
If the problem remains then you do have a fuel problem
If it goes away you have an ignition problem
Blowers tend to suffer more from kill switch failures than any other hand held .
Click to expand...


#10

U

unit91

No change. I noticed tht primer bulb only draws gas into carb when blower is on its side. Bulb, lines and filter are new.


#11

B

bertsmobile1

Thank you .
Every time something is ruled out that leaves fewer possibilities to be the cause .

So there are 2 lines of probable causes
1) fuel lines connected wrong
2) pump diaphragm requires replacement

Plus one possible cause
Internal filter on the carb is blocked

And can be all 3

Fill the fuel tank to the top and pump the purge bulb
You should hear the air bubbeling from the return line into the tank.
Tip the fuel out and pump the purge again to empty the carb metering chamber
Now 1/2 fill the tank with fuel & pump the purge bulb again
If the lines are backwards then again you will hear it bubbeling out of the air filter

Actually air from the filter sort of fizzes

The alternative is to fish the filter out of the tank, empty the tank into a jar
Drop the filter into the jar and pump the purge valve
If everything is hooked up properly then you will see the level in the jar drop and fuel will transfer to the tank .
If you see fizzing from the filter ( like a fish tank air pump ) then the lines are crossed .


#12

U

unit91

bertsmobile1 said:
Thank you .
Every time something is ruled out that leaves fewer possibilities to be the cause .

So there are 2 lines of probable causes
1) fuel lines connected wrong
2) pump diaphragm requires replacement

Plus one possible cause
Internal filter on the carb is blocked

And can be all 3

Fill the fuel tank to the top and pump the purge bulb
You should hear the air bubbeling from the return line into the tank.
Tip the fuel out and pump the purge again to empty the carb metering chamber
Now 1/2 fill the tank with fuel & pump the purge bulb again
If the lines are backwards then again you will hear it bubbeling out of the air filter

Actually air from the filter sort of fizzes

The alternative is to fish the filter out of the tank, empty the tank into a jar
Drop the filter into the jar and pump the purge valve
If everything is hooked up properly then you will see the level in the jar drop and fuel will transfer to the tank .
If you see fizzing from the filter ( like a fish tank air pump ) then the lines are crossed .
Click to expand...


#13

U

unit91

Will do. Thanks! I'll get back to you.


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