Poulan 3400 3700 4000 etc fuel lines

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Modifiedmark
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Had a question on the fuel lines on this series of saw so I thought I would post up how to fix these old war horse's up to keep em going, as this is all that most of them need.

First off, when you remove the recoil cover you see the 2 lines coming out of the tank. The one towards the front of the saw is the fuel line and the one towards the rear is the tank vent.

attachment.php



The fuel line I used is Oregon and is .117 ID, .211 OD.
Cut the end of the fuel line at a angle and slip it through the hole in the tank working through the filler neck. You can then grab the line with a pair of pliers and pull through what you need to reach the carb.

It is easier to me to remove the carb to get the line through to the inlet barb on the carb.

If your useing a new aftermarket filter, get one with a 1/8" barb on it to fit the new line. If your using the original filter you have to work the new line onto the filter, but it will fit.

The vent line has a duckbill valve on it, on the inside of the tank. Most often you will find it rattling around inside the tank as has fallen off the rotted old line.

Whats strange is I cannot find this Poulan duckbill valve and the plastic fitting it fits on in any of the IPLs for these saws, so I don't know if it can be ordered or not.

If your vent line is missing it's duckbill valve it's no big deal as you can replace it with the readily available Homelite #69451 duckbill valve and a piece of 1/8" od plastic tubeing.

The 1/8" plastic tubing is easy to get at most auto parts stores as its the same that's used for mechanical oil pressure gauges. Bad part is you only need about 3/8" of it.

You insert it in inside the tank end of the vent line, install the duckbill valve on the end of the tubeing and then pull the vent line up all the way to the top of the tank. Then route about 2" of the vent line up under the on/off switch as shown in the first picture.

attachment.php


attachment.php


If you don't want to bother with the duckbill valve you can use a #6 panhead metal screw in the end of the line, kinda like the vent screws used on some Stihl saw's.

I cut the end of the line at a slight angle when useing a screw and it works pretty good.


attachment.php


I know this maybe old hat for some, but I have had a few questions about this and just wanted to help them out, and I think the pictures help.
 
litefoot

litefoot

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Good pictures. Interestingly enough, I'm working on a Craftsman 358.XXXX series saw for a friend as we speak. It's a re-badged 3400. Seems to be a well-built saw. The carb won't hold pressure, so I've got a kit coming. Here's where I've found older Poulan parts (filters, carb kits, etc) on-line.
 
lawnmowertech37

lawnmowertech37

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Good pictures. Interestingly enough, I'm working on a Craftsman 358.XXXX series saw for a friend as we speak. It's a re-badged 3400. Seems to be a well-built saw. The carb won't hold pressure, so I've got a kit coming. Here's where I've found older Poulan parts (filters, carb kits, etc) on-line.

Parts Poulan obsolete


besides they dont have piston rings for the 245a
 
Last edited:
redunshee

redunshee

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Good pictures. Interestingly enough, I'm working on a Craftsman 358.XXXX series saw for a friend as we speak. It's a re-badged 3400. Seems to be a well-built saw. The carb won't hold pressure, so I've got a kit coming. Here's where I've found older Poulan parts (filters, carb kits, etc) on-line.

I've got a bunch of 3400 and 3700's Poulan and Craftsman badged. Heavy but really reliable. Hope you have better luck than me on carb rebuilds. I've done 8 and 3 of them still lose pressure at the diaphragm cover when put under 7 lbs of pressure under water. All have new kits and its driving me crazy. don't know what else I can due. The Walbro HDB carb doesn't have welch plugs that I can see so I'm stumped.
 
redunshee

redunshee

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Had a question on the fuel lines on this series of saw so I thought I would post up how to fix these old war horse's up to keep em going, as this is all that most of them need.

First off, when you remove the recoil cover you see the 2 lines coming out of the tank. The one towards the front of the saw is the fuel line and the one towards the rear is the tank vent.

attachment.php



The fuel line I used is Oregon and is .117 ID, .211 OD.
Cut the end of the fuel line at a angle and slip it through the hole in the tank working through the filler neck. You can then grab the line with a pair of pliers and pull through what you need to reach the carb.

It is easier to me to remove the carb to get the line through to the inlet barb on the carb.

If your useing a new aftermarket filter, get one with a 1/8" barb on it to fit the new line. If your using the original filter you have to work the new line onto the filter, but it will fit.

The vent line has a duckbill valve on it, on the inside of the tank. Most often you will find it rattling around inside the tank as has fallen off the rotted old line.

Whats strange is I cannot find this Poulan duckbill valve and the plastic fitting it fits on in any of the IPLs for these saws, so I don't know if it can be ordered or not.

If your vent line is missing it's duckbill valve it's no big deal as you can replace it with the readily available Homelite #69451 duckbill valve and a piece of 1/8" od plastic tubeing.

The 1/8" plastic tubing is easy to get at most auto parts stores as its the same that's used for mechanical oil pressure gauges. Bad part is you only need about 3/8" of it.

You insert it in inside the tank end of the vent line, install the duckbill valve on the end of the tubeing and then pull the vent line up all the way to the top of the tank. Then route about 2" of the vent line up under the on/off switch as shown in the first picture.

attachment.php


attachment.php


If you don't want to bother with the duckbill valve you can use a #6 panhead metal screw in the end of the line, kinda like the vent screws used on some Stihl saw's.

I cut the end of the line at a slight angle when useing a screw and it works pretty good.


attachment.php


I know this maybe old hat for some, but I have had a few questions about this and just wanted to help them out, and I think the pictures help.

Great pictures. I've simply inserted a bigger fuel line for a vent w/o a duckbill valve but I like your Homelite addition. I'll have to find some. I've got 5 3400's and 3 Craftsman 3.7's(Poulan 3700). Help me out here. Does air pass through the panhead screw? I would think it would block air but others have mentioned it so I guess it works.
 
Modifiedmark
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Great pictures. I've simply inserted a bigger fuel line for a vent w/o a duckbill valve but I like your Homelite addition. I'll have to find some. I've got 5 3400's and 3 Craftsman 3.7's(Poulan 3700). Help me out here. Does air pass through the panhead screw? I would think it would block air but others have mentioned it so I guess it works.


Yeah, but you have to use the right size screw, too big and it won't breath, too small and it will fall out.

Thats why I listed line ID and the screw size. I like the duckbill better but the screw will work but you may get a drip or two of fuel if the saw is at the just right angle sometime.
 
litefoot

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I've got a bunch of 3400 and 3700's Poulan and Craftsman badged. Heavy but really reliable. Hope you have better luck than me on carb rebuilds. I've done 8 and 3 of them still lose pressure at the diaphragm cover when put under 7 lbs of pressure under water. All have new kits and its driving me crazy. don't know what else I can due. The Walbro HDB carb doesn't have welch plugs that I can see so I'm stumped.

Did you wet the gaskets/diaphragms with premix before pressure testing? I think that'll make a difference. The carb I'm working with has a leak coming out of the impulse inlet, so I'm guessing I've got a hole in the pump diaphragm.
 
mattmc2003

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Well, i got my poulan 4000 running tonight. Thanks so much for the info. My duckbill is almost apart though, so i gotta fix that in the near future, but for now, at least i know it runs, and pretty peppy sounding too. The guy i got it from said it has been in the shed for 15 years, so thats pretty cool to me. Not even a new part on it except for the line and filter. Thanks again
 
redunshee

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Well, i got my poulan 4000 running tonight. Thanks so much for the info. My duckbill is almost apart though, so i gotta fix that in the near future, but for now, at least i know it runs, and pretty peppy sounding too. The guy i got it from said it has been in the shed for 15 years, so thats pretty cool to me. Not even a new part on it except for the line and filter. Thanks again

Modified Mark is very helpful. You'll like the 64cc of grunt. I've got one but haven't used it much as I'm getting involved in a total teardown of some 3400's. ModifiedMark and others have been very helpful with tips etc.
 
OhioGregg

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Great post ModifiedMark! :clap: It seems to me that alot of these saws would still be running and being used regularly if folks just new that a few relativly easy and cheap fixes that are all thats needed on these to get and keep them going. The fuel line, filter, and possibley a carb rebuild seem to be the First to look at doing to these great old Poulans. These saws were made over 20 years ago, and time will take its toll on plastic and rubber parts very quickly. Just the nature of the beast. And alot of these that I have seen sure look to have been used and abused for years with little care.
Gregg
 
firewoodcutter

firewoodcutter

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working on a friends saw, been a real pain in the Arse.
Someone before replaced the vent line and put some sort of metal air stone in the line.
Took me forever to realize this was the issue.
thanks for the pics detailing it!
 
cjcocn

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Mark

Great write-up and pics. Thanks!

I stripped my 3400 this evening and now have to order rings and a carb kit, and buy some fuel lines. I understand that the cylinder gasket is NLA so I will cut my own.

I have a question on the duckbill valve. I am not sure if mine is complete since it had a glob of black junk on it. The black junk was soft and wiped off easily with a rag.

Is the remaining piece a complete duckbill valve?

Here is a pic:
DuckbillValve.jpg


If so, I should be able to order the items that I mentioned above then it is off to the races.

Thanks, Mark!

:cheers:
 
Modifiedmark
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Mark

Great write-up and pics. Thanks!

I stripped my 3400 this evening and now have to order rings and a carb kit, and buy some fuel lines. I understand that the cylinder gasket is NLA so I will cut my own.

I have a question on the duckbill valve. I am not sure if mine is complete since it had a glob of black junk on it. The black junk was soft and wiped off easily with a rag.

Is the remaining piece a complete duckbill valve?

Here is a pic:
DuckbillValve.jpg


If so, I should be able to order the items that I mentioned above then it is off to the races.

Thanks, Mark!

:cheers:


Yes and Calvin mentiond that he had some!
 
cjcocn

cjcocn

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The gob of black junk was the duckbill valve.

:ices_rofl: ... somehow I found that response funny (I think because it showed my complete lack of knowledge about duckbill valves). Thanks for the laugh!

Okay, so in addition to the parts that I mentioned I guess I am ordering up a homelite duckbill valve unless I can find a usable one in one of my other saws.

Thanks for the clarification. :D

:cheers:
 

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