TommyT315

Cheers Spudulike for all the help

I have a vacuum testing kit and going what you say I could hook it up to the fuel line and if the vent is blocked then the pressure should get higher and higher. I think I’m right in my logic, am I?

I set it with a business card like I usually do. Got a reply from Husqvarna and they think it is more likely to be a bad new tank vent. So I will tomorrow remove the vent all together and see how the saw works. Hopefully that will be the problem and get a replacement from the dealer. Here’s hoping ?

Wow, I wouldn’t have thought that as mine has a great spark and actually starts superbly. Does anyone on this site know how to properly test a coil to see if it could be this without having to go and purchase a coil? thanks for your reply Giles

I bought the saw as a non runner needing a new piston cylinder & muffler. Was wanting it as a keeper but have been chasing my rear end with this issue. Will try the tank vent first, then the impulse line after that as I’ve tried a brand new carb but still doing the exact same thing.

I think it has to be a vapor lock as it runs again as normal for 2-3 mins when undoing the fuel cap. Have tried changing the spark plug, and have also sprayed wd40 to see if the carb is leaking air but it’s not. Will half fill it and remove the tank vent as suggested and see if that is the issue. It is a brand new vent but I suppose that it could be a bad one from a bad batch. Thanks for any of the ideas to fix it.

I’m at a loss, can anyone help? I have a Husqvarna 455 Rancher that is dying after two or three minutes on medium to high throttle. I have done the following to it: New piston & cylinder New crankshaft seals New bearings New muffler New carb diaphragms New fuel lines New tank vent I also tried a brand new replacement carb. It was first run with a full tank of fuel at idle so the new piston wasn’t damaged. It will run all day on idle. It only dies after revving it for two or three minutes. Once it stops I found that if I open the fuel cap and then close it again it will run again for two or three minutes. Any advice will be much appreciated as this saw is driving me bonkers.