AnthonySci
Seaman Apprentice
- Joined
- Dec 4, 2016
- Messages
- 35
I bought a used 7.5 hp, 2 stroke Merc a month ago. Before using it, I bought new, non-ethanol gas, added the Quicksilver 2 stroke oil, 50:1 and then ran it once for a couple hours fishing. It started right up with full choke, ran normal at idle and also with throttle open.
A week later when I went to use it, before starting, I noticed the fuel line squeeze primer bulb only would pump to "water-balloon semi-hardness." With full choke, the motor started on the 2nd pull of the rope. In less than 2 minutes, the motor coughed a few times, sputtered and then quit. (I'm fairly certain that I ran the motor out of gas---that it was running only on the gas that had remained in the bowl. Then, I was unable to start the motor.
Since then, I have replaced the entire fuel hose and the primer bulb and the bayonet shaped fuel connector.
I replaced all the fuel pump diaphragm gaskets. I removed and inspected the fuel inlet needle and the main jet, both are completely clean and clear. The short rubber vacuum hose that connects between the cylinder fitting and the carb throat is clear.
Gas is getting to the fuel pump diaphragm--- but NOT passing through it. The fuel filter visually appears unobstructed--I even removed it and then re-installed the carb and still no gas pumping into the bowl.
When I remove each spark plug and squirt a bit of fuel mix into each cylinder, then replace the plugs--with full choke, the motor starts right up, runs for about 2 seconds then dies (no fuel.) So I'm getting spark and compression.
Any ideas?
A week later when I went to use it, before starting, I noticed the fuel line squeeze primer bulb only would pump to "water-balloon semi-hardness." With full choke, the motor started on the 2nd pull of the rope. In less than 2 minutes, the motor coughed a few times, sputtered and then quit. (I'm fairly certain that I ran the motor out of gas---that it was running only on the gas that had remained in the bowl. Then, I was unable to start the motor.
Since then, I have replaced the entire fuel hose and the primer bulb and the bayonet shaped fuel connector.
I replaced all the fuel pump diaphragm gaskets. I removed and inspected the fuel inlet needle and the main jet, both are completely clean and clear. The short rubber vacuum hose that connects between the cylinder fitting and the carb throat is clear.
Gas is getting to the fuel pump diaphragm--- but NOT passing through it. The fuel filter visually appears unobstructed--I even removed it and then re-installed the carb and still no gas pumping into the bowl.
When I remove each spark plug and squirt a bit of fuel mix into each cylinder, then replace the plugs--with full choke, the motor starts right up, runs for about 2 seconds then dies (no fuel.) So I'm getting spark and compression.
Any ideas?