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335 fuel air tube...335 experts?

Posted: Tue Jan 12, 2021 9:24 pm
by alciuffetelli
Tearing down a Canadian 335 (2/71) that won't produce a steady fuel supply. With the generator removed and the fount pressurized, it is quite apparent that the fuel supply is intermittent. I suspect the fuel tube is the problem, so I pulled the valve assembly from the fount...but the fuel air tube really doesn't look like what I'm used to... I can't tell how to remove it. There isn't a four or six sided "nut" at the top to unscrew it, just a round wider section of tube below the threads that go into the fount. Is this f/a tube threaded onto the valve body or is it soldered?

Re: 335 fuel air tube...335 experts?

Posted: Wed Jan 13, 2021 12:53 am
by Phredd
A photo might help. See my other post

Re: 335 fuel air tube...335 experts?

Posted: Wed Jan 13, 2021 12:57 am
by hahoe03
Pliers

Re: 335 fuel air tube...335 experts?

Posted: Wed Jan 13, 2021 12:59 am
by zoomkat
" I pulled the valve assembly from the fount...but the fuel air tube really doesn't look like what I'm used to... I can't tell how to remove it."

Not an expert, but you should be able to trouble shoot possible issues with the fuel pickup tube without taking it apart.

Re: 335 fuel air tube...335 experts?

Posted: Wed Jan 13, 2021 1:47 am
by Northman49
Here is the F/A tube from a 335.
IMG_4184__1610502360_90078.jpg

Re: 335 fuel air tube...335 experts?

Posted: Wed Jan 13, 2021 10:10 pm
by BillG
Pliers Al....have done many of these

Re: 335 fuel air tube...335 experts?

Posted: Wed Jan 13, 2021 11:49 pm
by bdickson
Just saying that I recently was working on one of the 335 that I have and could not keep it lit when I fired it up. After partial tear down I was able to get a steady diet of fuel out of the generator by simply opening the know several turns and not just the 1/4 on the dial. Works fine now. I also try to heat my generators prior to turning on the fuel. Helps a lot to prevent fire balls.

Re: 335 fuel air tube...335 experts?

Posted: Thu Jan 14, 2021 3:16 am
by alciuffetelli
Northman49 wrote: Wed Jan 13, 2021 1:47 am Here is the F/A tube from a 335.

IMG_4184__1610502360_90078.jpg
Yes...that's it. Never having seen this before, I was hesitant to put pliers onto the head of the tube to try to unscrew it. Discretion is the better part of valor...

Re: 335 fuel air tube...335 experts?

Posted: Thu Jan 14, 2021 4:01 am
by zoomkat
"Discretion is the better part of valor..."

You should be able to trouble shoot any issues without taking it apart.

Re: 335 fuel air tube...335 experts?

Posted: Thu Jan 14, 2021 3:34 pm
by alciuffetelli
zoomkat wrote: Thu Jan 14, 2021 4:01 am "Discretion is the better part of valor..."

You should be able to trouble shoot any issues without taking it apart.
not in this case...the sluggish fuel pick up was remedied by stretching the spring on the metering rod. But I tread gingerly in areas I'm unsure about, thus the benefits of discretion. There are breathing problems that remain, but as always, one thing at a time. Currently thinking I need a new burner cap and screen...but I'm really impressed with how bright this little 335 is when it runs right. Still wish it were a 202...

Re: 335 fuel air tube...335 experts?

Posted: Thu Jan 14, 2021 3:36 pm
by alciuffetelli
BillG wrote: Wed Jan 13, 2021 10:10 pm Pliers Al....have done many of these
Thanks, Bill...that's the kind of information I can use. One of the first and lasting lessons of Fettle 101 is that brass is soft and can break! This part of my problem is fixed...now to find a new burner cap and screen!