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Merc50 imploded/exploded VST float

 
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zuunami



Joined: 10 Aug 2021
Posts: 223
City/Region: Fort Bragg
State or Province: CA
C-Dory Year: 2006
C-Dory Model: 16 Cruiser
Vessel Name: Oh Buoy!
Photos: zuunami
PostPosted: Tue Jun 07, 2022 5:55 pm    Post subject: Merc50 imploded/exploded VST float Reply with quote

Our Mercury 50hp (2006), running great until a few weeks ago, started spewing fuel. On taking it apart, it appears that the float inside the VST has either imploded or exploded! Smile We've ordered the parts to fix it, but wonder if anyone has any idea why this might happen? thanks! - Karen




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Karen W. and Robert R.- Fort Bragg, CA - Oh Buoy!
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Byrdman



Joined: 06 Nov 2003
Posts: 3320
City/Region: Cumberland River, Clarksville,
State or Province: WA
Vessel Name: " ? " After Rename Ceremony
Photos: FreeByrd and C-Byrd
PostPosted: Wed Jun 08, 2022 3:38 pm    Post subject: Reply with quote

Thankfully no fire!
Hope parts are available.

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Patrick Byrd "Byrdman"
Cumberland River TN home waters Puget Sound Summers.
Miss B - CD22A, Aug 2018
C-Byrd, CD18A, Hull #14 sold again.. May 2020
C-Byrd, CD18A, Hu #14 - Bought her again - May16
Aloysius, Sold to Brother Mike Mar16
Aloysius, Hull # 440 RF-246
C-Byrd, CD18A, Hull #14 Sold May09
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Never Deny Yourself The Pleasure of Helping Others.
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journey on



Joined: 03 Mar 2005
Posts: 3593
City/Region: Valley Centre
State or Province: CA
C-Dory Year: 2005
C-Dory Model: 25 Cruiser
Vessel Name: journey on
Photos: Journey On
PostPosted: Wed Jun 08, 2022 6:33 pm    Post subject: Reply with quote

I'd hate to lose an engine off FT. Bragg, that's open ocean.

Whats a VST?

In ignorance, Boris
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jennykatz



Joined: 15 Dec 2003
Posts: 1678
City/Region: naples
State or Province: FL
C-Dory Year: 2006
C-Dory Model: 23 Venture
Vessel Name: Little Treasurer
Photos: Jennykatz
PostPosted: Wed Jun 08, 2022 7:51 pm    Post subject: VST. Vs FSM Reply with quote

On Yamaha you have a Vapor Separator Tank
On newer Mercury they call it a Fuel Supply Module

They both do the same thing .They usually have a lift pump to pull up from the fuel tank and then there’s a high pressure pump for the fuel rail ( fuel injection) engines

So what might have happened your lift pump didn’t shut off ( there’s a. Float that can jam up ) and pressure built up cracking the plastic casing or just a very old engine with plastic FSM that cracked You might have to buy the whole FSM ?Good Luck

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retired 8/08 from UAL, still working pt tm
Duck c-22 cruiser sold 6/23/08
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00 cd16 cruiser honda 40 sold 3/12
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zuunami



Joined: 10 Aug 2021
Posts: 223
City/Region: Fort Bragg
State or Province: CA
C-Dory Year: 2006
C-Dory Model: 16 Cruiser
Vessel Name: Oh Buoy!
Photos: zuunami
PostPosted: Thu Jun 16, 2022 7:37 pm    Post subject: Reply with quote

thanks folks, we replaced the imploded float and associated parts (still $150 but better than $1k for the whole unit), and it runs great again.

Thanks Jennykatz for the possible cause, it's a mystery to us still, but will look at the lift pump as a potential cause. The motor is an original 2006 to the boat, and from the history we have, not used much. But at least all is well now Smile
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jennykatz



Joined: 15 Dec 2003
Posts: 1678
City/Region: naples
State or Province: FL
C-Dory Year: 2006
C-Dory Model: 23 Venture
Vessel Name: Little Treasurer
Photos: Jennykatz
PostPosted: Mon Jun 20, 2022 7:19 pm    Post subject: Vst Reply with quote

Make sure you change out your water /gas separator filter (I change mine every 50 hrs also same with your eng filer and try to use non ethanol gas Good luck
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zuunami



Joined: 10 Aug 2021
Posts: 223
City/Region: Fort Bragg
State or Province: CA
C-Dory Year: 2006
C-Dory Model: 16 Cruiser
Vessel Name: Oh Buoy!
Photos: zuunami
PostPosted: Mon Jun 20, 2022 10:17 pm    Post subject: Reply with quote

Thanks, did both. No non ethanol fuel anywhere near here Smile We use Mr. Filter when we get our gas, not sure if it helps or not, but can't hurt Smile
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