gas pickup

what does the fuel pickup tube look like? and how can i take it ouy of my 1980 nautique?

what happens is when the fuel gauge reads half tank i cannot get full throttle. it feels like it is not getting enough fuel. everything is fine until the gauge reads half full. i"ve replaced the fuel lines and filter. The Holley carb acts fine up to that point. I thought maybe the pickup had holes in it sucking in air when the fuel level was low. Thanks for the reply.

do you have any tips on tank removal? thanks

take back seat out if you have one ..you shouldn't lol take back wall out. take hose clamp of filler neck connected to tank .remove small lag bolts or screws holding tank to raised wood slats.2 per side. disconnect fuel line from anti siphon valve that attaches to 90 on top of tank. while your at it pull it off and clean with break cleaner while shaking back and forth till the ball is totally free..pull tank out and then remove sending unit wires..then pull tank out all the way.while your at it re pack the rudder packing.and check the condition of blower and blower venting tube. thats all i can think of.hope that helps

One quick way to verify if the anti-siphon vent is plugged, is to simply open the fuel filler cap to the fuel tank. This will vent the tank.

Start off with the fuel filler cap in place. When you start to experience the symptoms of less than full throttle you are describing, open the fuel filler cap and see if the symptoms reduce. If that happens, then it's more than likely that your anti-siphon vent is plugged.

JQ

if the vent line gets clogged from a mud dobber itll run fine until it creats enough vacuum in the tank from the fuel pump,if you vent the filler cap thatll give you an answer on the vent hose or fitting being clogged,

Thanks for all the replys. I just took the boat out and sure enough at half tanksame b.s. took the filler cap off and no change. i did put a fuel pressure gauge on, but didnt think to check that. i think im just going to remove the fuel tank and clean. I was told that if the fuelv pump was bad it would just quit all together.

well i removed the tank cleaned it out , though it was already in good shape. as far as i could tell there was no anti siphone valve. the pickup tube was also very clean . had the carb checked out by a pro, a few problems there. gonna put it a;ll back together and see what happens. i will also install a fuel pressure gauge. on ano6ther note, was going to install new manifolds that i had on my ski supreme that i no longer use. my question was would it be a good idea to use a torch and just cut off the manifold allen bolts seeing as just about half of them are fd up?

thanks, that sounds like a good idea using the cuttoff wheel. the 90 degree elbow on top of the tank that connects to the feed line is open, nothing inside of it. i pointed a flashlight down the tube in the tank with no obstruction seen.