92 Nitro 190dc Owner
Well-Known Member
I've had multiple sporadic issues with the VRO pump over the years with fuel leaks. Rebuilt the VRO twice, totally replaced the VRO with a new one. Repairs don't seem to last. I got tired of dealing with it and replaced the VRO with new regular fuel pumps. New primer bulb will pump up hard. I start the engine and it runs until the fuel in the carb bowls is consumed and the motor dies. If I keep up the fuel pressure by pumping the bulb while it is running, it will continue to run. As soon as I stop, the motor will eventually die. I've run the outboard from a separate fuel tank and fresh fuel mixed with oil at 50:1. Fuel filter is clean. Fuel lines are not restricted. I've rebuilt the carbs and ensured all orifices (idle, mid, and high speed) are clean. All carb floats are set according to specs. Throttle plate sync'd, idle timing, spark advance set, and spark/throttle pickup are all set according to specs. All fuel lines are clamped appropriately with ratchet clamps or zip ties per service manual. If there's a air leak in the fuel system, not sure how to locate it. Pulse limiter valve is clean. Primer checks out (ohms within specs and both primer outlets are clear. New diaphragm for vapor pump. Vapor separator float set to specs. I do need to replace the vacuum switch. Definitely a fuel issue, but not sure where to go from here. What have I missed?
Update: Forgot to mention that I checked all fuel lines for cracks. Did a pressure test on each fuel line and all checked out (no drop in pressure). The only thing that I didn't check is the fuel bracket, but not sure how to test that.
Update: Forgot to mention that I checked all fuel lines for cracks. Did a pressure test on each fuel line and all checked out (no drop in pressure). The only thing that I didn't check is the fuel bracket, but not sure how to test that.