1990 Johnson V6 VRO Outboard - Intermittant loss of propulsion under a load

[Bluelab]

My engine starts fine from cold start. The Quickstart kicks in and I am on my way...WOT. When I turn the engine off and sit in the water for greater than 5-10 minutes, the engine start fine. I attempt to go under a load and it stalls. Before it stalls, I move the control module to neutral, run the engine up to 2K - 3K rpm for about 1 minute, power down to neutral and then I can go without a problem. This problem started when I had a new fuel filter installed and a new primer bulb and fuel line was changed out. I then changed this new fuel line for another fuel line and primer bulb and added an anti siphon valve. Same problem...but did not change the new fuel filter. To note, I can also get it to go under a load by making 2 trips to the primer bulb and squeezing it...always 2 times. Strange? With my old fuel filter, the engine alarm was going off when the rpm was increased and turning off when the rpm is decreased. Than manual states that this is an indication of a dirty fuel filter and the alarm was going off because the engine is running lean and consequently over heating. Now I wonder if with the new few filter the engine is running too rich. Quite an enigma.

 

[Faztbullet]

Get rid of the anti-siphon valve,,,,,,

 

[emdsapmgr]

I have had problems with the anti-siphon valves before. They are ok, but may require some maintenance, maybe even a new one. Pull the anti-siphon valve out of the system. Hold it over a white paper towel. Get a can of either Carb cleaner of Brake Cleaner. Put the straw in the spray nozzle of the can and push it down onto the spring-loaded ball of the valve. Spray the ball valve while pushing it open-so that any debris sprays onto the while towel. After done, look at the towel. Any black bits of debris? That debris will inhibit the function of the ball valve and it can stick the ball so the engine won't run right.

 

[ondarvr]

Probably an air leak allowing fuel to drain out of the filter and/or fuel line, reving the motor or pumping the bulb refills the system.