ok, first, if i`m a pain in the neck, shut me down. period.so, a year or so ago, i thought i had this licked. put on an electric pump, rated at 4 pounds. ok, ran good, constant 3, minimum , thru the mechanical. now, out of the blue, other nite coming home from a cruise nite, opened margie up, layed down at 4 grand. opened the hood, on the gauge, zero. so, just now, by-passed the mechanical, started at 3, down to zero, in the driveway, 2000 rpm for 30 minutes. i know i did this before, but i`m going to drop the tank, check the sock, EVEN THOUGH it`s the 3rd sending unit.ok, just a thought, ya need the vented cap, right? so, i have that flap in the filler neck. could that be the "not" venting problem? again, shut me down, i`ll just put a bullet in my head. nyuk, nyuk, nyuk.