How comical can it get!

So the list of stuff wrong, goofy, or broken continues. So I crawl under the coach to clean all the fuel lines off for a better inspection and I found the electrical connection for the fuel selector switch is not connected. I am thinking that I finally got by problem solved. Not so fast! I reconnect the switch connection, tighten the nut for the lead on the switch (slightly loose) and jump in the coach and the beast fires up pronto and strong. It idles for five minutes and stalls yet again. So I am looking at the filter and it barely shows signs of gas going through it. So how dumb am I, I really don't know how much a flow an in line filter (plastic visible one) should have. Quite the gurgle or just a small steady trickle??? Also, say the selector switch has not been connected for a LONG Time what can happen to the fuel delivery with that? Anyways, I am trying a new in line filter tomorrow to see if the gummy crap I sort of see is hindering the flow of the gas. Crazy, I had a small hole in the line before the fuel pump and and switch was never hooked up! When it rains it pours. How comical can it get!

"plug the line from the rear tank" does that mean between the two tanks or plugging the line at the selector valve. I plan on trying a new fuel filter first and maybe applying a small amount of air pressure to the lines for evidence of a leak. What precautions should I take in regards to the air pressure? I was just planning on plugging some hose ends prior to the tank. Applying maybe 20 lbs pressure ???

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Are you saying (Matt) that if I find a way to hook up the hoses directly without the selector valve and let the system run without it maybe it would tell me if the valve is binding inside???