XL 12 doesn't want to start

[riseandrun]

Greetings all! Hopefully by the time I done with this post it will make sense and you'll know what I need. I have an XL 12 that I mess with on occasion and I've yet to get it started. It's a manual oiler. and it's red. It's in pretty good shape. compression is almost 150. I have a decent spark. Carb has been cleaned. I've changed the fuel line and filter. I'm using the yellow tygon fuel line. L and H are backed out 1-1/2. After several attempts to start the saw, I pulled the line leading to the carb and their was fuel going to the carb.nipple. What happens is I'll get a good fire and an almost immediate die. I'm trying to get to the school if it doesn't start on 4-5 pulls there's a problem because I don't want to hurt my shoulder pulling on the cord. I also have a SXLOA that I had a similiar problem with and finally fixed it with putting the right fuel line on it. Here's the confusing part. Here's what the fuel line looked like that went on the SXLOA: www.ebay.com/itm/HOMELITE-MOLDED-FUEL-LINE-SUPER-XL-XL-12-63745A-/130985339506?hash=item1e7f55aa72. It's the ONLY line that worked on that saw. The hole to the tank and the carb nipple where both very different in size. I'm sure there are pro's reading this that will disagree and actually fixed their saws without that line, but.... The XL 12 has a grommet in the tank and the carb. nip. allow a 3/16 tygon fuel line to work. No need for a molded line.
I can't figure out if I have a carburetor problem, a fuel suction problem (if there is such a thing) or what the actual next step is to fix this really nice XL12
Thanks all!

[sawnami]

By any chance do you have anything to pressurize the carb through the fuel inlet with a gauge on it?

[riseandrun]

You mean like an extra cap that I could drill a hole in and pressurize the tank somehow? Is my thinking incorrect that there will not be enough suction from the carburator to the tank to draw enough fuel to run the saw? Almost like I need a fuel pump in the tank to push the gas to the engine?

[dancbx]

Have you tried it without the fuel filter attached? Perhaps the filter is clogged and it is collapsing the line or just not allowing enough fuel in.

[sawnami]

Sept 23, 2015 17:57:48 GMT -5 riseandrun said:

You mean like an extra cap that I could drill a hole in and pressurize the tank somehow? Is my thinking incorrect that there will not be enough suction from the carburator to the tank to draw enough fuel to run the saw? Almost like I need a fuel pump in the tank to push the gas to the engine?

Actually put on the carb fuel line nipple and pressurize the carb it should hold around 5 PSI.

[riseandrun]

Here's the newest update: It's running GREAT!!! After spending about an hour on it last night recleaning the carb. (just in case, although it looked very clean but we all know that's not a sure thing.) I also changed the duckbill in the gas cap. The one in there was pure dissolved plastic. I read on another post about a guy trying to get his saw running and one of the members suggested as old as the saw was he should change all duckbills including oiler. (mines manual) I wish I knew for sure what the actual problem was, but one thing for sure is the duckbills are getting changed. I don't know if this is standard procedure for you pro's, but it's definitely something I will be doing on all of my repairs from this point out.
Thanks for all the help guys. Sawnami I'm going to have to put together one of those kits.
R&R