not very optimistic but here goes --- started having fuel pump problems with 9 month old 90 HP Johnson --- last carbureted 2 stroke they made --- coincident with first use of E10 fuel in NJ --- fuel pump will not pump sufficient gas to motor and dies at normal operating speed (I rarely exceed 4,000 rpm) --- have to hand pump fuel to the motor to keep engine running --- have replaced original pump which lasted 9 mo with 3 additional pumps - 1 used 2 brand new - each pumps works for a while (varies from a coupe of hours for the used pump to a couple of months for the new pumps) --- but then fails in the same manner --- I have a new pump (pump #5) but I'm afraid to install it since I have not identified the problem --- I have a friend who is a retired Johnson/Evenrude dealer/mechanic who can not figure the problem out --- his assessment is that the pumps are definably failing but he doesn't know why --- I have changed the fuel line components between the fuel tank and the motor --- the tank is polyethylene (the boat is an 18' 2000 Sea Pro) --- I have changed all of the fuel filters / water separators several times including the water separator housing --- my friend has recommended I switch to an electric fuel pump --- but I can't stop wondering what is causing the problem --- it would be much cheaper to go electric than keep doing what I'm doing now --- I do a lot of fishing where I power drift (i.e. slow troll) with the motor in and out of gear and it is difficult to hand pump fuel and work the throttle at the same time all day --- I have a 2 ft length of tygon tubing (inert clear plastic tubing) installed in the fuel line by my friend to check for air in the line and have observed air bubbles in the line which increase over time --- I have run with the gas cap open and the squeeze ball never collapses from negative pump pressure --- the problem is more prevalent in hot weather then in cold with the frequency of stalling less likely in the colder weather --- ANY IDEAS regarding the cause of the problem or similar experience would be very help full --- Thanks ! ! ! leadhead