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14.05.2021 1:06:25
Pump the primer bulb to move fuel into the carburetor or -- if you have a fuel-injected motor, into the low-pressure fuel pump -- before you start the motor. Pump the bulb until it is firm to the touch. more
See full version: How to Keep a Prime on an Outboard Motor
Pump the primer bulb to move fuel into the carburetor or -- if you have a fuel-injected motor, into the low-pressure fuel pump -- before you start the motor. Pump the bulb until it is firm to the touch. more
Open the cap on the fuel tank before trying to start the motor. Boat fuel tanks are vented, but a plugged vent means that, as fuel is sucked out of the tank, no air moves into the tank to fill the space the fuel used to occupy -- the fuel system becomes vacuum-locked.
Buy good quality fuel only. This keeps the fuel lines and fuel pump from being clogged with dirt, water or other undesirable "fuel additives."
Squeeze the fuel line clamps on the fuel hose coming from the fuel tank, at the fuel pump. Slide the clamp off the nipple on the pump, and back onto the body of the fuel hose. Push the fuel line off the carburetor nipple. more
Cylinder Compression [links]
When an outboard boat motor “floods,” it has too much fuel in the cylinder. This can make it either difficult or impossible to start, depending on the severity of the situation. Even if your boat motor will start, you should try to find out what’s causing the issue so you can fix it. Continuously running a flooded motor will degrade its components while subsequently reducing the life expectancy of your motor.
Gas-powered boat motors require a precise mixture of fuel, air/oxygen, and heat. When there’s an imbalance of these elements, the motor may fuel with an excess amount of fuel. As a result, starting the engine may prove difficult due to the wet spark plugs. So, what are some of the common causes of flooded boat motors?
A third possible cause of a flooded boat motor is a low cylinder compression. The air inside the cylinders is compressed to help regulate the ratio of fuel-to-air. If the pressure is too low, fuel will gradually build up, and eventually it will flood the engine. Use a standard compression gauge to test your cylinder’s compression. Unfortunately, there’s no easy way to fix low compression other than replacing the head gasket. [links]
Incorrect use of the priming pump may also cause a boat motor to flood. The priming bulb is a small rubber button that pumps fuel into the motor when pressed. If this bulb is pressed too many times, it will flood the cylinders to the point where the spark plugs can longer ignite; thus, rendering your engine dead in the water. Priming boats aren’t restricted to boat motors; they can be found on lawnmowers, weedeaters, leafblowers, and pretty much any other type of gas-powered motor. here
This year when I put it in gear it will go forward but only at very slow speeds, any extra throttle and it dies I can't nurse it up to speed like last year.
Thats where I would go back to. Even after taking the carbs off and cleaning them if you have anything in your tank or lines it will just go right back to the float and flood your engine. Have you changed your fuel lines to new approved lines for ethanol? (Alcohol resistant fuel lines). You could clean your carbs a hundred times the new fuel will keep junking them up with the wrong fuel line in use. [links]
In my case, the ultimate cause was that I changed fuel lines and didn't flush them out, so some itty bitty bit of sloodge worked its way into the float valve and ruined my day (actually, it was a couple weeks before it was solved).
Ok, another update. Things are getting better, but still a starting issue. The choke solenoid is new and working properly. All choke plates close when choke is engaged. I bought a new marine battery and a new set of plugs. Yeah, I should have replaced the plugs before I ever tried cranking. So new fuel, fuel lines, plugs, choke, and all is working perfect. I just have one small issue. The first time I start it, after sitting all night or for several days, I have to spray a mist of starter fluid across the front of the carbs. Not directly in them at all. Just a 1/2 second blast across the intake holes. It fires up and runs perfectly. Using this method, I can leave it sitting for 4-5 minutes or 4-5 hours and when I turn the key and engage the choke it starts in 1/2 second. This was the case over several days of testing. I'm puzzled that it takes that little burst of starter fluid for that first start in the morning. Any ideas?? I almost feel like I should just live with it. After all the tinkering with this motor I'm thrilled that it runs so well. I think I'm willing to live with the little burst of starter fluid on fishing mornings but my mind keeps dwelling on the fact that it's not quite 100% right. I appreciate any ideas and thanks in advance.
It means that the needle valve in the carb is bad, or float level is set too high.
Re: Carb has fuel running out of bowl when I pump the primer bulb [links]
Re: Carb has fuel running out of bowl when I pump the primer bulb more
Re: Carb has fuel running out of bowl when I pump the primer bulb here
Ok, so should I overhaul while I've got it torn apart or does that sound like a lot of work for a moderate fix?