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Bob, If you check the vent hole by taking the gas cap loose, like Ray said to do, and you still get no flow you have a blockage of one of the filters in the sediment bowel. The easiest to check is the one at the top of the sediment bowel. Shut the valve at the sediment bowel and loosen the clamp on the sediment bowel. Remove the sediment bowel and open the valve. Gas should come streaming out - drips and dribbling do NOT count. Good gas flow means the valve/filter in the tank are OK. Clean/replace the screen at the top of the sediment bowel - it fits up in valve body where sediment bowel is. Wouldn't surprise me if you do not have a screen, which is why someone added the inline filter - a fire waiting to happen!!! Check archives as someone had his N burn up because of an added inline filter!! If, as I fear you you may find, the gas drips out, then the valve and/or in tank filter is plugged. Been there, fixed that!!! UGH!! I let one tank drain OVER a week and still had to "catch" gas when I pulled the valve out of the gas tank. I have a picture of one that I'll try to post tonight after I get home. It was SO FILLED UP with rust, varnish, and other crud I'm surprised the N got any gas at all - even when I test ran it before I bought it. The filter inside had so much hard crud on it that it broke at the slightest touch - #@$%&*!! can't replace just that filter, had to get whole new valve/sediment bowel assembly at about $20. My advice to you is to get rid of the inline filter. There should be three filters in the gas flow to the carb. 1. in the tank above the valve, 2. at the top of the sediment bowel (gas flows up thru it to the line to the carb) and 3. on the end of the elbow that goes into the carb. These are all fine mesh brass screens. Any particles that get thru them are so small that they should not hurt the low compression flat head engine in an N. Acutally, I suspect that the engine gets MUCH more harmful grit, etc. into it from air leaks in the air filter/carb/manfold. These leaks will let in dust (powdered sand - silicon oxide - hard) where as most of the "dirt" from the gas is rust (iron oxide not as hard as sand) from inside the tank. And all but the smallest particles are caught by the filters or drop out in the sediment bowel. MY opinions ONLY, your mileage may vary. :-)
Larry
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