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I highly recommend setting up to do your own injector service and calibration because on these machines it's super cheap and easy. I got a pop tester on eBay for about $120 and White Owl has injectors at $80 each plus they carry shims and other parts. The TM is pretty clear do a search here...

As soon as I run out of spare filters I'm buying a spin on setup. I hate that thing.

It shouldn't be able to draw air in there if the tank pump is working properly.

One possibility is that you not only have a small leak but you also have an under performing lift pump. Assuming that you are getting a bunch of small bubbles that collect into pockets when off (sure seems like that by your description); it's possible the injector pump is just over pumping the...

Yep fuel line leak. It's small so when it runs the bubbles are tiny and don't affect operation (very much). When you stop all the little bubbles gather together and air bind the system. Since it's still rather small you've been able to get away with some starting fluid to bump the cranking RPM...

Well you've chased the supply to the HH pretty well. If it was leaking you should have seen it. Now maybe test the output: try cracking an injector line and see if you get a good pulse out of it while cranking. I'm thinking you have some goo in there wreaking havoc.....

So..... once again: does your lift pump work? That's the pump in the tank. You should hear it come on when you switch on the power before starting/cranking. You should be able to flush the primary filter (passenger side, front area of motor) with just the power switched on it should squirt out...

Part of the pre start walk around checks is to turn the ignition on and open the bleed screw on the first filter to drain off any crap in the system. If you're pump failed you'll know it when you do this. That's how I found mine went kaput. Screw the $500 in tank replacement. Get a Walbro...