My 1st guess would be intake leak/intake gasket... then maybe PVC system. I would direct the water to the gasket area instead. THe fuel pump would've never been on my list because pressure checks woulld've told me otherwise. Misfires can also cause lean conditions, so you may want to check your plugs & condition of wires or boots, whichever is applicable. Without any diagnostic equipment, it's playing guessing games.