Diesel Fuel System

B

Beneteau

.
Jul 17, 2011
21
Beneteau oceans 321 Saint John
Our 1998 Beneteau 321 with a Yanmar 3GM30F has been on the hard for the past year and won’t be launched till next season .When pulled the diesel fuel additive was added to the fuel tank before the the engine was shut down.the question is should I drain the diesel tank at the start of next season and fill with fresh fuel.
Thank You all in advance
 
jssailem

jssailem

SBO Weather and Forecasting Forum Jim & John
Oct 22, 2014
23,271
CAL 35 Cruiser #21 moored EVERETT WA
@Beneteau There is no necessary reason to do that. Old fuel and new fuel burn pretty much the same.
It depends.
How much fuel do you have in the tank?
Do you want to clean the tank?
Have you had any issues in the fuel filter? Is it clean?
When you changed the fuel filter did it look like this?
IMG_1169.JPG
This is what a dirty fuel filter looks like.
 
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B

Beneteau

.
Jul 17, 2011
21
Beneteau oceans 321 Saint John
Tank is full and clean ,filters both primary and secondary are clean changed season before las haul out and those filters were clean
 
jssailem

jssailem

SBO Weather and Forecasting Forum Jim & John
Oct 22, 2014
23,271
CAL 35 Cruiser #21 moored EVERETT WA
How much fuel?
 
LeslieTroyer

LeslieTroyer

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May 20, 2016
3,015
Catalina 36 MK1 94 Everett, WA
John had so much practice changing dirty fuel filters he could be back running in under 5 minutes - assuming he had fuel in the tanks. :poke:
 
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Gunni

Gunni

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Mar 16, 2010
5,937
Beneteau 411 Oceanis Annapolis
Beneteau said:
Tank is full and clean ,filters both primary and secondary are clean changed season before las haul out and those filters were clean
Click to expand
Don’t worry about the fuel, work on the engine oil and coolant changes. Make sure you have a new o-ring in your fuel cap.
 
NYSail

NYSail

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Jan 6, 2006
3,145
Beneteau 423 Mt. Sinai, NY
Bluenose said:
Was it a biocide you put in the tank? That should always be used.
Click to expand
Biocide conversation it seems is like anchors.... in 15 years I have never used the stuff, but I do make sure I use all my fuel and keep my tanks clean.

Greg
Souleil
 
DougM

DougM

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Jul 24, 2005
2,242
Beneteau 323 Manistee, MI
Personally, I wouldn’t worry about it if you had added stabilizer to the fuel. Due to extenuating circumstances, my boat remained on the hard through two Michigan winters with a half full fuel tank. We did an oil change, one of the batteries still indicated 12.5 volts, launched, and the engine started immediately. It took us half the season to burn most of the fuel remaining.
 
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