Mercury Outboard vapor separator problem

cell2366243

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Nov 15, 2025
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I have a 2019 Mercury 50hp 4 stroke EFI. When I pump the bulb to prime i have fuel leaking out of a small tube on the bottom of the Vapor Separator. I took it apart thinking it was the float but that checks out good. That small tube on the bottom is leaking and it looses prime. Can anyone tell me what that tube is supposed to do and why it's leaking. Thanks.
 

Fun Times

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May 16, 2009
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Engine serial number handy to look at a parts catalog / diagram?
Do you have a service manual yet for your engine?

Without looking it up yet ‘one thought would be it’s a rubber / spring loaded diaphragm gone bad (hole) and letting the fuel leak out the vent tube side of the system.
 

dingbat

Supreme Mariner
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Nov 20, 2001
Messages
16,804
I have a 2019 Mercury 50hp 4 stroke EFI. When I pump the bulb to prime i have fuel leaking out of a small tube on the bottom of the Vapor Separator. I took it apart thinking it was the float but that checks out good. That small tube on the bottom is leaking and it looses prime. Can anyone tell me what that tube is supposed to do and why it's leaking. Thanks.
Don’t know about your particular motor, but a leaking vent on an EFI is typically the high pressure fuel pump is on the way out.
 
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