My nephew has a 2005 Starcraft Fish Master with a Mercury 175 2 stroke main motor and a 2006 Mercury 9.9 4 stroke kicker. It's been sitting several years and he's trying to get it running. He had had the 9.9 running but it ran poorly and was leaking fuel out the top of the carb, so we rebuilt the carb and cleaned the jets and everything, replaced the fuel filter, plugs, etc. So after all that it wouldn't start. Then he disconnected the fuel line and it starts and runs great until it burns all the fuel in the carb. The fuel line for the 9.9 is T'd off of a line shared by the 175. The 9.9 has electric start and remote throttle/choke. Looks like a solenoid and servo motor that controls everything.
I thought it was fuel pump related so we took that apart and it looks ok, but not great so we ordered a fuel pump diaphragm kit and haven't installed it yet. But when we plug the inlet and blow into the outlet, it has pressure. That seems to indicate the diaphragms are good, correct? I'm also wondering if the diaphragms are bad how that would stop it from starting with the fuel line attached...wouldn't the carb float needle valve stop excess fuel? The fuel pump has four fuel connections, 2 near the top and 2 near the bottom.
There is also a plunger/rod assembly deal on the corner of the carb, with a check valve inside the carb that sits on top of the plunger. That plunger looks like it's in good shape but I'm not sure what that thing is for. I have a feeling this fuel pump rebuild isn't going to fix this problem, so if anyone has any pointers that would help. I've never seen an issue like this before.
I thought it was fuel pump related so we took that apart and it looks ok, but not great so we ordered a fuel pump diaphragm kit and haven't installed it yet. But when we plug the inlet and blow into the outlet, it has pressure. That seems to indicate the diaphragms are good, correct? I'm also wondering if the diaphragms are bad how that would stop it from starting with the fuel line attached...wouldn't the carb float needle valve stop excess fuel? The fuel pump has four fuel connections, 2 near the top and 2 near the bottom.
There is also a plunger/rod assembly deal on the corner of the carb, with a check valve inside the carb that sits on top of the plunger. That plunger looks like it's in good shape but I'm not sure what that thing is for. I have a feeling this fuel pump rebuild isn't going to fix this problem, so if anyone has any pointers that would help. I've never seen an issue like this before.
