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06-05-2023, 03:52 PM
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#1
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Member
City: Williamsburg
Vessel Name: Vitamin Sea
Vessel Model: Mainship 34 trawler
Join Date: Apr 2023
Posts: 6
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Mainship 34 trawler fuel return
Hi folks,
I just purchased a 2005 Mainship 34 T with a single Yanmar 370 engine. The ride home was rough and a lot of junk got sloshed around in the fuel tank. I am going to install a fuel polishing system but I need some help. Where is the fuel return? I have found two lines coming out of the tank adjacent to each other and I assumed that one was for the generator and the other for the engine.
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06-05-2023, 05:53 PM
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#2
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Veteran Member
City: Pasadena
Vessel Name: Nauti'Kel
Vessel Model: 34 Mainship Pilot
Join Date: Jul 2020
Posts: 36
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You should have two 125 gallon tanks. Each tank has a return. On my 34 pilot, where the return line leave the motor(starboard side) it has a selector valve for port or starboard tank return. My return lines are near the vent line in both tanks.
Rich
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06-05-2023, 06:17 PM
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#3
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Senior Member
City: madisonville la
Vessel Name: Princess M
Vessel Model: 2006 Mainship 34
Join Date: Aug 2015
Posts: 143
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If you have a racor with a sight glass it does a good job of cleaning your fuel.Check it a lot and keep many filters handy.
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06-05-2023, 06:20 PM
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#4
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Valued Technical Contributor
City: Litchfield, Ct
Join Date: Aug 2012
Posts: 6,636
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The OP has a 34T, not a Pilot 34. The 34T has a single fuel tank forward of the engine.
Unfortunately I can’t remember where the fuel return is. I sold my 34T a number of years ago.
David
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06-05-2023, 07:54 PM
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#5
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TF Site Team
City: Seneca Lake NY
Vessel Name: Bacchus
Vessel Model: MS 34 HT Trawler
Join Date: Nov 2014
Posts: 7,504
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Not aboard but have had to do some DIY filtering/water separating in the past.
The return is in the same area as the supply line. I just followed the hoses to confirm.
I hooked up a 12V pump and water separating filter first using the supply & return. I thought they were relatively close and wanted to return at another location.
I was able to run the filtered return up to the access plate on stbd walk-around near the fuel fill and fabricated a 1/2" copper "U" shaped fitting w 2 90° ells and a few short pcs of pipe that allowed essentially hanging the return hose at the gunnel fuel fill so return was via the fill hose. That gave me a little more separation.
My fuel tank had plugged fittings for twin engine use and I considered trying to insert valves for off- line fuel polishing but hesitated to risk spilling fuel. I have heard the use of a shop vac & covering vents effective for quickly replacing plug with valve but hesitated to try it.
If you are installing a permanent polishing arrangement I would consider using the p,urged fittings on the opposite (port) side
__________________
Don
2008 MS 34 HT Trawler
"Bacchus"
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06-05-2023, 08:34 PM
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#6
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TF Site Team
City: Ex-Brisbane, (Australia), now Bribie Island, Qld
Vessel Name: Now boatless - sold 6/2018
Vessel Model: Had a Clipper (CHB) 34
Join Date: Jun 2008
Posts: 10,025
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Welcome to the forum - and good luck with all that. It's meant to be fun, remember... 
__________________
Pete
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06-05-2023, 08:41 PM
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#7
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Veteran Member
City: Pasadena
Vessel Name: Nauti'Kel
Vessel Model: 34 Mainship Pilot
Join Date: Jul 2020
Posts: 36
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My apologies Jim. I will go back to my corner.
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06-06-2023, 06:54 AM
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#8
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Member
City: Williamsburg
Vessel Name: Vitamin Sea
Vessel Model: Mainship 34 trawler
Join Date: Apr 2023
Posts: 6
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I do have the site glass
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