Husqvarna 350 question from a new guy

[Meansy67]

Hello all,
New to the forum, but I have been reading on here for the past few months, and you all are a great source of info for my projects. I recently was given a Husqvarna 350 saw from a relative. He hadnt used the saw for 2-3 years, and he knew i enjoyed tinkering with them. Well i thought it would be a nice addition to my saw lineup, and i could use if for a backup to my Stihl MS 290. When i first inspected the saw and tried to start it, it would not start at all. I threw some new gas in, and checked the spark plug, but it still would not run. I pulled the air filter off, shot a little starting fluid in the carb, and pulled. All i would get is a quick fire from the starting fluid, then the saw would die. It would do this at full choke and no choke. So i figured that i was not getting fuel. When i tore the saw apart, i found that the fuel line was also cracked and would need replaced. I ordered and installed a new carb, spark plug, air filter, fuel filter, and fuel line. Well I got the saw all back together, and put in fresh gas, and went to fire it up. I ended up getting the same results, it would not fire. I pulled the spark plug out, and it's not wet at all. When i pulled the fuel line off the carb, it doesnt seem to be pulling any fuel from the tank either, nothing ran out of the line. Now i don't claim to be a mechanic of any kind, i just kind of like to tinker around with things. Could it be i didn't re-install something right, or is there a larger problem? I noticed that there seems to be two fuel line fittings on the carb, one on either side. When i tore the saw apart, there was only a fuel hooked up to the fitting on the throttle side of the carb, the other one (left side) had nothing hooked up there. Should there be a second fuel line on this fitting? I'm hoping somebody on here has an idea what i have done wrong, as i'd really like to get this saw going. It's in great shape other than it obviously not being able to run. Thanks for any help you all can give.

 

[RiverLogger]

How did the impulse system look? Did you replace the impulse line too? I would imagine if the fuel line was cracked that the impulse is in the same condition. Sounds like your problem to me. How much compression does the saw have?

 

[Meansy67]

Here is where my lack of knowledge will really show. By the impulse system, do you mean that there should have been another line running to the carb? When i pulled the saw apart, the only line running to the carb was the rubber fuel line running from the in-tank filter to the throttle side of the carb. I noticed that there is another fuel line type fitting on the choke side of the carb, but there was nothing running to it. I'm guessing there should be? If there is, where does this line run to from the carb? The engine will fire with a shot of starting fluid, and will run for about a second, then die. That along with the fact that no fuel it being delivered is leading me to believe that there is no vaccuum pressure pushing fuel thru the line. But I don't know where this sort of vaccuum would come from unless there is another line running from the tank somewhere back to the carb.

 

[RiverLogger]

What year is this saw? Does it have a primer bulb on the right side by the recoil handle? The impulse system on the 350s have a very short line on the intake partition, did you check this line? Does the partition connect to the cylinder with a plastic or metal clamp?

 

[watsonr]

What year is this saw? Does it have a primer bulb on the right side by the recoil handle? The impulse system on the 350s have a very short line on the intake partition, did you check this line? Does the partition connect to the cylinder with a plastic or metal clamp?

Yep, why it's not pulling fuel, it doesn't feel the impulse from the cylinder which is required to move the fuel diaphragm (fuel pump) in the carb.

 

[Meansy67]

I'm guessing this could have been my original problem, as I didnt find this line at all when tearing apart the saw. I'm not sure of the year, but it does not have a primer bulb. I guess i'll have to look online for this impulse line. So I get that it runs from the other outlet on the choke side of the carb, but where does it go to? I'm pretty much going 100% off of the advice on here now, since it didnt have the line when i started. Any idea where i can get this line? Thanks a bunch guys

 

[RiverLogger]

The impulse line is at the bottom of the intake boot. Check the boot for cracks while you're there. The impulse line is about an inch long and connects to two nipples right there on the bottom of the boot. Don't use Tygon for this, buy the OEM Husky pigtail fuel line for this. Tygon cant take the heat. Please post the carb brand and number also. Wondering if you even have the correct carb on there? You said you bought a new carb, but there are different carbs for these 350s based on the year.

 

[Meansy67]

I purchased the carb from ereplacementparts.com. The part number is 503283210. I know it's a Zama, but cant remember the model number off the top of my head. And i bought the Husky pigtail fuel line that runs into the fuel tank, but i didnt see any other fuel line listed on the parts diagram i was ordering from. I guess i really need to be sitting in front of the saw to describe the setup. Thanks

 

[watsonr]

You only need about an inch. I've cut a little from the fuel line and used that, it's plenty long..... or head to the dealer for a small piece. Most of the 350s use Zama part C3-EL18 for the carb.

 

[Meansy67]

Ok, so i checked the serial number and it is an 05 model, so i have the right carb. I have plenty of extra fuel line, so i don't need to buy one if i can make this work. I attached some pics of the new carb and the old one. The new carb is in the pics of the carb in the saw, and the old carb is the pic of the carb sitting on the work bench. In the pics of the new carb, you can see the fuel fitting on the left hand side of the carb. The old carb does not have this fitting at all. So if i run this impulse line from this fitting, where do i attach it?

 

[RiverLogger]

I think you have the wrong carb. You need a carb identical to your old one, with only the fuel line hooking up to the right side. The new carb you have is a new style carb that works with a purge bulb setup. 07 and newer use the new carb you have. Your old carb should be fully functional with a rebuild kit, about $10-$12 bucks.

 

[RiverLogger]

Just looked and you do have the wrong carb. This is the C3-EL32, you need the C3-EL18 like Randy said. Part number you need is
503 28 32-08. I would just fix the one you have though as I stated above. Looks like you have plenty of fuel line too. Just cut off a chunk of what you have there and use it for the impulse.

 

[Meansy67]

Thanks for the help guys. I ordered the correct carb rebuild kit today, so now i guess I have a C3-EL32 for something down the road. I now get to try my hand at rebuilding a carb, so that should be fun. Hope i don't have pick you guys' brains too bad on that one. And i think i found the impulse line on the saw. There is chunk of hose right on the bottom of the plastic intake flange directly in front of the carb. It looks like it just hooks back into this flange, and doesnt actually hook into the carb at all. Which seems to make sense due to the correct carb not having a hook up anywhere on it for this impulse line. I need to pull the line off and make sure it's not cracked any, and put a new one on if it is. Once the parts come in it looks like i'm back to tinkering with the saw to get it running a little while longer. Thanks for all the help with this and thanks for putting up with my lack of knowledge guys!

 

[watsonr]

That little hose is the impulse line, just replace it as it's a pain to get to and putting the old one back on may damage it anyway. The carbs are basically the same internally. Take the EL-32 apart slowly, remember the order of gaskets and such and put them into the old carb taking care not to blow high pressure air thru it when cleaning. Use a good carb cleaner with the red straw attached to clean out the passages. You can go to the Zama web site if you forget the order of parts when putting them back together...

Make sure to remove the limiters from the EL-32 BEFORE you use it anywhere.

 

[RiverLogger]

You are correct, the impulse system is the line you found. Feel free to ask any and all questions. There are no dumb questions here. Well......maybe there are dumb questions but we'll give you a break.


EDIT: Randy beat me to it.

 

[half_full]

I couldn't tell from the pics but someone already mentioned the plastic intake clamp. That should be addressed too.