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#115217 02/05/22 07:15 PM
Joined: Jan 2016
Posts: 7,427
Likes: 135
NormK Online Content OP
SENIOR TECHNICIAN
I just fitted a new carby on a Poulan chainsaw and for some reason it isn't sucking fuel up. It primes up and will start and run but after 30 seconds it stops, prime it again and it starts revs fine no issues but then it cuts out. Anybody have any thoughts?

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NormK #115219 02/05/22 08:20 PM
Joined: Jul 2018
Posts: 2,082
Likes: 80
SENIOR TECHNICIAN
Lines are up backwards Norm? Or I have been caught out with the fuel line stuck up in the tank, if you prime it on its side its under fuel level, when you put it upright it is out of fuel

What model poulan?

NormK #115220 02/05/22 08:30 PM
Joined: Jan 2016
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NormK Online Content OP
SENIOR TECHNICIAN
Hi Tyler,
it is a Poulan 2050. Lines could be crossed up, carby was different from the one I took off, original had the fuel in on side top with the return on the bottom. New carby I assumed to fuel in on the side top with the return on the bottom opposite side. Priming it I can see the fuel flowing through the lines

NormK #115221 02/05/22 08:36 PM
Joined: Sep 2015
Posts: 1,996
Likes: 137
SENIOR TECHNICIAN & HISTORIAN
Hi Norm and Tyler

I'd probably check these things first .

I had a Poulan saw that did the same thing and it ended up being the fuel hoses ,it had too tight of a bend in
the hose ,worked fine when I first put the carby on then a week later the hose just would not let enough fuel through
with a slight bend must be because the lines are tiny inside.

Also if you get this problem I reverse the fuel lines just to check ,sometimes you can mix them up and sometimes
running the lines in reverse, then if that doesn't work put them back on the right way and it has cleared the problem.
Probably gets the one way valve working for the primer also you will test the valve by it working one way and not the
other way.

When the primer bubble (purge bulb) has a problem it could cause this problem if the one way valve isn't working ,I also
reverse the lines on the primer if it's a remote primer and try it both ways as that can sometimes get the
one way valve working again and you will see if the one way valve is stuck open as the lines should only work one way
for priming.

Try it with a fuel filter that you know works fine and sometimes you can get a slight leak in the fuel hose inside the tank
above the fuel level.Replace all the hoses as second hand hoses are very dodgy but you've probably done that
already.





Cheers
Max.

NormK #115222 02/05/22 08:48 PM
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NormK Online Content OP
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Thanks Max,
all new hoses and new primer. Bit of a bitch to swap the hoses on the new carby because I have to remove the carby to get to the bottom hose but I will try swapping things around as you say. I tested the remote primer as I installed it with only the pick up hose connected to ensure it sucked fuel up

NormK #115224 03/05/22 12:26 AM
Joined: Sep 2015
Posts: 1,996
Likes: 137
SENIOR TECHNICIAN & HISTORIAN
When the fuel hose is reversed the wrong way and the primer bubble is full of fuel most times the bubble can't be pushed
as the one way valve stops fuel going in the reverse direction.

Yes a little bit of a pain to get to the hoses on this saw ,I have one here I can check tomorrow ,save messing
around with the lines.

Pic below ,I can check if it's the same on my Poulan saw.

Cheers
Max.

Attached Images
$ a a a Poulan-chainsaw.png (134.77 KB, 36 downloads)
$ a a aSOLVED.png (172.47 KB, 32 downloads)
NormK #115227 03/05/22 10:36 AM
Joined: Jan 2016
Posts: 7,427
Likes: 135
NormK Online Content OP
SENIOR TECHNICIAN
Thanks Max,
Interesting drawing that nothing like what I had here. I assume that the top hose is the fuel in and the bent one on the lower opposite side is the return to tank line.

https://www.ebay.com.au/itm/144384674760?

NormK #115229 03/05/22 11:55 AM
Joined: Sep 2015
Posts: 1,996
Likes: 137
SENIOR TECHNICIAN & HISTORIAN
Yeah it's nothing like the saw Norm ,that's why I had a look.

If you get the fuel hose on the wrong side of the wiring it will kink the hose, on the mixture screw side of the carby.

Cheers
Max.

Attached Images
IMG_20220503_101742_589.jpg (92.24 KB, 19 downloads)
IMG_20220503_101856_751asaa.jpg (121.04 KB, 19 downloads)
IMG_20220503_101949_665.jpg (84.89 KB, 19 downloads)
IMG_20220503_102012_362aaa.jpg (116.65 KB, 19 downloads)
IMG_20220503_102432_761.jpg (91.58 KB, 19 downloads)
IMG_20220503_102703_456aaa.jpg (137.28 KB, 19 downloads)
NormK #115230 03/05/22 12:06 PM
Joined: Jan 2016
Posts: 7,427
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NormK Online Content OP
SENIOR TECHNICIAN
Thanks Max,
no problem at the moment with hoses kinking but I will give it a try the way the diagram shows

NormK #115232 03/05/22 01:43 PM
Joined: Jan 2016
Posts: 7,427
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NormK Online Content OP
SENIOR TECHNICIAN
Good one Max,
The diagram sorted it out, choke mechanism fouls on the air filter so a bit of heat on it should sort that out .
Thanks again


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