I have a fuel problem

[Blue197320]

you have to take the carbs off the engine to do this.

[shine]

anti siphon valve might be problem. I have had to remove a couple of them on different boat in order to get adequate fuel flow. You can push the ball and spring out with a screw driver, then test to see if that solves the problem. If not, then I would replace it with another one (not expensive) as they are a nice thing to have (required ).

I have had 2 strokes that just pulled gas too fast (drank gas) and would close of the valve. Also, a newer yamaha 4 stroke has a low pressure fuel pump that turns on intermittently at low RPMs (becasue it doesn't pull enough gas at idle), when that pump woudl kick on it woudl lock up the anti siphon valve

[jorgeinmiami]

Well I'm home now and I started to go thru it to see what is the problem

Vent line is ok with nothing restricting it
took apart fuel pump and diaphragm looks good
changed the small filter under the cowl
took out the plugs on the carb bowls to see what came out and it looked clean
took some carb cleaner spray and cleaned out the carbs when I took them apart and the insides looked clean, spayed it into every little nook and cranny and into any thing that looked that it could clog and put back together.

replaced all the "zip ties" with SS clamps on the gas lines under the cowl.

The engine fires right up and runs in idle with no problems

I am going to go with an Aux tank to see if it is something in the tank sometime this weekend

All that remains is the pickup in the tank, which involves undoing the console then the tank cover and putting it all back........something that I really do not want to do in the Florida heat and humidity