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Grand marlin .... BINGO matey. You've hit the nail on the head.
That's exactly what everybody wants to know.
Wasn't so hard was it. Damn site shorter then 11 pages of mumbo jumbo
I did a search on the net and the phenomenon of water condensation in fuel tanks is widely recognised and not just in boating sites. It pops up in farming equipment, aviation and automotive sites.
I remember someone mockingly suggesting that aeroplanes would be falling out of the sky if condensation was real. I had a laugh when I found an air safety alert published by the FAA. They warn of fatal air crashes caused by water contamination of fuel. Among the causes they list condensation in fuel tanks. They recommend filling tanks to the top post flight.
They also mentioned some of the features in the design of aircraft that help fight the problem. Planes use a floating fuel pick up so that the fuel is not constantly drawn from the bottom of the tank. Also they employ a sump or water trap in the system. Naturally they also use water separating filters.
If I could add one more thing to the list, it would be to have a drain off point, or an inspection opening at the back of the tank.
Hard to get with store bought tanks, but if you are having one custom made, it is a good idea to ask for one. At least then you have direct access to where the water will be sitting should you ever need to drain the tank.
Very long winded, I agree, but there were some great points raised and discussed, and argued, and argued again !
Cheers
Pete
ps. I modified my post to include the drain off / inspection opening.
I also changed it to read definitely no metho in the diesel.
At least now if anyone has to refer to the list, it is as complete as we can make it.
Another tip is to carry one or two portable fuel tanks with fuel line. They have got me back several times when I have had my motor coughing from water in the main tank. It was my fault in these cases for not draining the filter bowl, but we all slip up from time to time. The extra fuel is also good insurance if it gets rough or you have to play a marlin for a few hours.
I have a friend that purchased a new boat 4 months ago and due to illness he has not been able to use it.
The tank as about 20 liters of fuel in it and should he drain the tank or top it up with fresh fuel.
It is a 175 hpdi yamaha as the one i have .
If members think that he has to empty the tank to put fresh fuel in how does he get the old fuel out.
I have the same motor and i am not sure how you can do this
Troy
It will be OK to top it up with fresh assuming the tank will hold 100 or more litres. Ie one part old fuel to 4 parts fresh. You can use high octane fuel or add an octane booster as well. Make sure he uses it soon after, or the stale fuel will catalyse the degredation of the fresh fuel and he will end up with 100L of stale fuel.
If you want to drain the tank you can just remove the connector from the fuel hose and squeeze the primer bulb.
this thread has got me looking at my system and i've noticed on the standard mercury 'quicksilver' filter/ seperator that came on my 480 quintrex that there is no drain plug. it looks like a standard automotive oil filter. It was replaced at it's last service just prior to xmas but i would like to see if there is any water present in the tank to rule out any future prob.'s. Is it as simple as just removing the unit and tipping out the contents or some other proceedure to avoid drama's..thanks
Grand_Marlin is right-- In a nutshell, the hotter the tank can get, with the least amount of fuel, the more it will condensate... also replace the filter regularly or rather wash them in clean petrol having 2 filter cartrages will be an advantage and if you mount the filter in a accessible place you can replace fast and easy
Try masey Ferguson filter with a glass bowl and a tap or cav
Implse that is what i meant from your pic
)
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