I'd still remove fuel line from injector and fill quart glass jar....it wud only take small drops water to plug up injector....water does not compress.... when pressure is removed water will give way to good fuel to injector.... as soon as you turn key on pressure builds... giving you only seconds of fuel.... is car automatic or manual trans.... if manual try pull starting.... see if you can get it to run few blocks.... this might also set a new DTC .... somewhere else or new to look for ideas... good luck... drain all fuel.... this can give you a lean run for few seconds... now you can control the fuel source.... start looking for chafing on wiring...eg. coil...injector... crank sensor.... cam sensor... all the time you have put into this... makes me think simplest solution.... stick with it... curiosity got me edge of my seat...