I have had my Dart running for 10 years has never had a problem except for starting after setting for a couple of months. Specs….408, aluminum heads, 10.6 cr, Mallory hyfire, cell in the trunk, hi volume electric pump going to a bypass regulator under the hood, bypass line back to the cell. 850 quick fuel with electric choke. Had the same exact issue with a quick fuel 750 without choke. I run only 93 octane but all of the 93 around here has 10% ethanol in it. It will not fire a lick without squirting fresh 93 down the throat, then it will fire on the first cylinder hit. Once running for a few seconds, no issue and the beast is loose. I would assume that the fuel in the cell is getting a little stirred by the bypassed fuel going back in the tank and swirling a little. I have a Yamaha 1300 FJR that I have not fired in 8 month with 87 octane, with ethanol, and it fires right up. Both are in a heated garage. Someone just told me, and it makes sense, that when gas with ethanol sets, the ethanol will sink to the bottom and cause the starting issues. Anyone heard of this or any thoughts?