WARlrus
06.06.2021 1:23:18
Check the water stream fitting on top of your motor to ensure your motor's water pump is operating. Vapor lock occurs in motors that are unable to cool the fuel by other means. [links]
See full version: How to Stop Vapor Lock in an Outboard
Check the water stream fitting on top of your motor to ensure your motor's water pump is operating. Vapor lock occurs in motors that are unable to cool the fuel by other means. [links]
Ensure the vent of the fuel tank is open. As fuel is pulled from an unvented tank, a vacuum forms in the tank that stops the flow of fuel, a situation know as vacuum lock. If the vent on the tank appears to be open and unobstructed, remove the cap from the fuel tank and pump the priming bulb until the bulb is full of fuel to resolve the problem.
Vapor lock is the bane of summer for boaters. Parts of an outboard motor's fuel system are cooled or vented to prevent or break up the bubbles in fuel lines that cause vapor lock. Some boaters have installed clear plastic fuel lines so they can visually detect bubbles in the fuel although it's an unsafe practice; fuel lines should be of a Coast Guard-approved type. The quick fix for vapor lock is to allow your motor to cool. More drastic measures are required to stop vapor lock. [links]
Use a lower octane fuel. Vapor lock is the result of the evaporation of aromatics in the fuel line.
Locate the motor's fuel pressure regulator. Remove the fuel pressure regulator's cover spring and diaphragm using a Torx screwdriver. Inspect the diaphragm for cuts, nicks or abrasions and replace if necessary.
One customer mentioned that he was running the boat for about 4500 RPM and something suddenly decreased the speed; not electrical power. more
On the port side of the engine, there is an adapter plate with 2 nipples; one brass and one while plastic.
Another customer mentioned that the diaphragm in the fuel system was the cause in his case. His mechanic could trace it by checking the air pressure in the system.
I have seen that some owners are fighting with the issue for a long time. [links]
My opinion on outboards is throw all the stuff that you don't need away. The less components to fail the better off you are. Then you can tune via an adjustable fuel pressure regulator as well.
I'd love one of those brucato acu's but thats more than im willing to spend on the boat at this stage. Is there a problem running the stock EFI pump and FPR the way you mentioned? Im just looking for reliability mainly, but also performance if it's a simple/cheap job like re-aranging the fuel system. [links]
In your case Gene with the old analog ECU and sensors it might be a good thing to consider running a high pressure pump and 39 psi regulator. Along with one of Brucato's ACU's. [links]
Doesn't the oil line just dump into the vst on a stock setup?
1994 mercury 90hp outboard 2 cycle here
Re: Mercury 90HP 2 cycle Oil Leak more
what size of vinyl tube is it? my 1994 mercury 90hp (oil injected) outboard cracked too.
:joyous id a preliminary check and found the line connections from the tank to the pump extremely hard and suspect there might be a crack. Will check lines more thoroughly when the weather gets wormer and let you know. more
Re: Mercury 90HP 2 cycle Oil Leak more