Chief Alen

Nope don't toggle the switch work with the tank that feeds that motor, unscrew the fuel filter and dump in a clean container and let sit, if there is water you will see it. Just screw on a new element, can be had at any marine store bring the old one with you and make sure the rubber gasket is still on the can. work your way back from the carb, last thing you should do is rebuild the carb if you can't get it to run right after you do what i posted in my first reply, understand? and no you don't need new fuel hose, my hoses are close to 30 years old and the new fuel has not damaged mine one bit. Need any more help email me !

No primer bulb on this boat. But a fuel water separator, maybe.

At the fitting that enters the carb there is a filter remove and clean. Run it again it still doing it, then move down the fuel line cleaning every filter. the anti-syphin valve could be clogged up or the fuel pickup tube., could have a screen on it at the bottom. Are you drawing fuel from the same tank for both engines? If not the T where it comes in to the engines might be clogged. Last i might think of rebuilding the carb, might be clogged up with gunk. And yes jostling the tank like you did might have stirred up all the gunk in the tank you could, get that stuff out of the tank . You could stick a hose hooked up to a cheap auto 12 v fuel pump costs maybe 12 bucks at any auto store, with a 6-7 foot hose in the tank and 5-6 foot hose on the other side of the pump, and pump the water and gunk off the bottom of the tank, water is heavier then fuel will sit at the bottom with the gunk. Pump the junk into a clean, clear container and when you see clear fuel, stop the pump pull the hose. and you can do this thru the fuel pickup hole when you check the anti-syphen valve.

Rebuild the carb it's gunked up.

I have mbs also / multiple boat syndrome . I also have a 1976 Arrow Glass Couger 15' with a 70 hp Evinrude. Never kissed saltwater. Runs like brand new. I also have a 1986 Citation 20' i/o Merc 140 stringer. Run only in salwater sinse new. 1960's unknown make 12' jon boat 3 hp sears air cooled 1960's outboard, runs like it was brand new and never kissed saltwater.

It's pumping fuel up to the carb fitting? You do a pressure test to see what pressure the pump is giving you? 4-6 psi no less, a little more is ok.There is no way around the carbs being rebuilt. what you really need is a link to where the carb rebuild kits are being sold.

Ok you can try rebuilding both carbs, sounds like they are all gunked up. I bet they are rochester carbs. Remove them from the manifold, split the bottom from the top half, and allow them to soak in acetone over night, make sure the whole carb is submerged. In the morning you remove them and blow dry with compressed air, and with a can of carb cleaner blow theu ever little hole, make sure EVERY hole is spotless. Then with the compressed air blow dry again repeat till its clean, reassemble carb, and reinstall with a fresh gasket, on the manifold. When both are reinstalled,turn in the adjustment screw carefully, GENTLY, YOU DO NOT WANT TO BEND THE BALL ON THE END OF THE ADJUSTMENT SCREWS, till they bottom out. Then back out with both screw 2-2 1/2 turns to start. There is a screen / filter at the inlet fitting of each carb remove and clean or replace each filter. There is a filter in the fuel pump, clean it. Then disconnect the inlet hose from the fuel pump and put temp a hose on to a external tank of fresh fuel. Dribble a little gas in each carb. And fire it up. Or you can take both carbs to a pro and let him rebuild them.

I'll burn it thru my gas lawnmower, bring it over here.

First post here, the anti-syphon valve if you have one can be sticking, or a vacuum condition may be present in the tank, is the vent clear? Also maybe the fuel pickup tube in the tank may be clogged there should be a screen on the bottom of the tube.. You could unscrew the angle fitting at the tank that the fuel line enters ,that is the valve and blow thru and eye ball the ball to see if it's clear. and the fuel pickup tube will be connected to that fitting. Good luck!