Fuel Delivery Issue

[mj58595]

I have a 1993 200 johnson ocean runner that i just put back on my boat. It ran fine before i took it off 3 months ago, but now i am having fuel delivery issue. Motor starts on first crank as long as it is primed, but will only run the fuel that is in its carbs. In other words, I can pump the primer bulb to keep it running, but wont siphon fuel itself. I have checked all of the lines and made sure all connections are tight, bypassed the fuel/water seperator, check diaphram in fuel pump, but still no luck. Primer bulb does not cave in, so i dont think that there is a blockage in the tank.

Could it be a carb issue since it sat for three months???

Any ideas? All i can think of is it is pulling air somewhere, but i cant find.

Thanks

 

[MovingTarget]

Re: Fuel Delivery Issue

Carb floats? Not letting gas in unless pushed in? Just an idea.

 

[mj58595]

Re: Fuel Delivery Issue

maybe, but wouldnt it have to do that to all 6??? Just a question, I am by all means no mechanic.

 

[mj58595]

Re: Fuel Delivery Issue

One more thing. I dont know if this matters, but i changed the water pump while it was off the boat as well.

 

[Chris1956]

Re: Fuel Delivery Issue

That motor should have a vapor seperator on it. Perhaps the vapor seperator cover gasket or vapor pump is defective.

 

[mj58595]

Re: Fuel Delivery Issue

Okay, two questions.

1. Is that the assembly to the left of the VRO/fuel pump that has a scrader valve on it?
2. If so, is there a way to test it?

Well 3 questions....

For my knowledge, how could this affect the ability to pull fuel through the carbs?

 

[Chris1956]

Re: Fuel Delivery Issue

The device with the schrader valve is likely the enrichener (modern version of a choke). Vapor seperator should be part of the plastic device that the gasoline line is connected to. Above the vapor seperator should be the vapor pump.