J115ELEDR ('96 115 Looper) Dies After 3 Seconds

[ksubigbuck]

I will try to keep this short. I bought a boat and motor that had not been run in 2 years. I verified compression before purchasing. I immediately rebuilt the carbs, replacing warped bowls in the process. After putting everything back together, I can't get the engine to run more then 3-5 seconds before it dies. It seems like I can get it to run longer by pushing the key in (sometimes), or running to the back and pumping the bulb (if I can get back there in time.) Also, I am using a 1 gallon tank of 50:1 until I can verify the VRO is working.

Any ideas what is causing this? Fuel pump diaphram?

Thanks!

 

[boobie]

Squirt some premix fuel in the carb throats once and see what happens.

 

[heypawpaw]

If pumping bulb keeps it running probably the fuel pump. If motor doesn't keep running while pumping bulb, verify spark will jump 1/4" with open air tester blue spark with a snap.

 

[James R]

Boobies test is the first. I use a clean detergent spray bottle containing 50:1 mix. Remove the silencer box and spray directly into the carb intakes. If the motor picks up it is a fuel supply problem. Squeezing the primer bulb assists the fuel pump and if the pump is not working well the motor will pick up. To prove that it is not a fuel tank blockage remove the hose connection at the tank and put the end of the hose in a container of 50:1 mix and try again. You can of course use another hose and primer bulb if you can't get at the tank connection.

 

[oldboat1]

While running premix, disconnect the VRO oil supply by plugging the oil line at the pump, and disconnect the VRO wiring harness. If the VRO is in fact working, your oil to gas ratio will be rich -- may be stalling the engine.

May need carb needle valve adjustment (subsequent to insuring the ratio is correct — not over oiling).