Flooding motor

ajp

Petty Officer 1st Class
Joined
Jan 6, 2002
Messages
280
I bought a boat with a 1969 Johnson 115Hp last August. After replacing the power pack, among other things, I got the motor running and everything seemed to be great. Then a problem came up. After the boat sits for a day or so. It would flood out when trying to start the engine cold. I mean no fire at all. I would pull the plugs, change them or heat them up, hit the starter with plugs out, them put them back in and the engine would start right up. <br /><br />Someone told me then to try running the engine out of gas to kill it. We did that on the first weekend out on our fishing trip and it worked great. Back at the dock - run it out of gas(unhook the gas line) and it would always start back up cold. Worked on a 3 day fishing trip. Like clockwork, as long as you empty the carbs by unhooking the gas line, no problems. <br /><br />Question - Does this sound like the floats are stuck open and the gas tank and ball pressure is filling the cylinders with gas as it sits. Causing an automatic flood the first time you try to start it? Or the seats are the wrong size or wore out. <br /><br />Other than this problem it runs great. Idle and WOT.<br /><br />Any Ideas.<br /><br />Arlan
 

Fouled Plug

Ensign
Joined
Jun 29, 2001
Messages
935
Re: Flooding motor

I would check the inlets first. May have one hanging up, or a bit of crud on the needle/seat. I personally hate running a 2-stroke out of fuel (especially multi carbed ones) because you run out of lube at the same time. It may not hurt anything, but if I can avoid it I do.
 

davidd267

Cadet
Joined
Nov 24, 2001
Messages
22
Re: Flooding motor

have you tried to disconnect the fuel line when you stop it ? If it sits with the fuel line connected and the tank heats up you might get pressure into the carbs. assuming you close the vent . Another thought are you sure it is flooding ? When you pull the plugs are they wet ? when you turn the motor over does exess fog come out of the plug holes??
 

ajp

Petty Officer 1st Class
Joined
Jan 6, 2002
Messages
280
Re: Flooding motor

My next step is to un plug the line from the motor. I just installed a quick disconnect at the motor. The last owner had the fuel line hose connected directly to the fuel pump. I believe that unhooking without running out of gas will propably work fine, but it doesn't solve the real problem, just avoids it.<br /><br />The plugs come out wet. No spark. Heat them or put in new plugs after spinning the motor for a second with them out, and the motor starts right up. <br /><br />Arlan
 
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