2021 DIY: I Cleaned the Vapor Separator Tank (VST) on a Mercury Outboard EFI

February 27, 2021. The Mercury 60 hp 4-stroke EFI outboard motor has been stalling at low rpm. In hopes of fixing the problem, I inspected and cleaned the high pressure fuel pump strainer located in the Vapor Separator Tank (VST). It is quite possible, a clogged fuel strainer constricts the flow of fuel.

[@sjcbulletininfo6535]

Thanks: I changed the low and high pressure fuel filters, replaced the low pressure fuel pump, and finally, cleaned the very dirty VST filter. It ran like a charm. It was fuel starvation.

[@davidromerochannel]

Great job!

[@Eitapau1]

Got a little dizzy from the Bourne Identity camera work but was able to get it at the end...

[@YvickVentilatie]

I’ve the same issue on low rpm. Did it solved the problem?

[@davidromerochannel]

No. My low pressure fuel pump was the culprit. The VST suffered fuel starvation. ua-cam.com/video/zm8xGbd5m_I/v-deo.html

[@dwright2474]

Hey I’m having a problem on a 2012 mercury 90 EFI.
The fuel pumps have been replaced twice and it will run out of fuel and shut off. If I pump the bulb it will run fine.
I have replaced fuel lines and both pumps twice at this point, do you think cleaning this would solve the problem I bought someone else’s problem thinking it was a running motor. The mechanic said there was water in it when he got it.