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Post by crayman on Jul 11, 2020 7:13:09 GMT
i have a 2019 1095 merry fisher with mercs,problem with bad fuel blow back ob stb tank , fitted new poly one way valve fuel line vertical no kinks any clues?? Maurie
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Post by erik1095 on Jan 11, 2021 0:11:15 GMT
i have a 2019 1095 merry fisher with mercs,problem with bad fuel blow back ob stb tank , fitted new poly one way valve fuel line vertical no kinks any clues?? Maurie
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Post by erik1095 on Jan 11, 2021 0:12:36 GMT
I have an NC 1095 2019. Both tanks Portside and starboard have a slow fuel fill. The marina is looking into it now. They've called the engineers because they can't figure it out.
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Post by rene460 on Jan 11, 2021 7:23:28 GMT
Hi Erik, The obvious thing to check when experiencing blow back on refuelling is for kinks or other flow restrictions in the fill line. But equally important is the vent line. For fuel to enter the tank, an equal volume of air must be displaced, so the vent line must also be free flowing without kinks, and without any loops that can trap a little liquid. The vent line is often smaller than the fuel inlet but the same volume must pass through. This can cause too much back pressure.
Also worth checking the pumps at the refuelling dock. Certainly I notice at land based service stations, the diesel pumps have a button for high flow, and not necessarily with the large nozzle that is provided at truck stations. If the dock regularly fills very large tanks, it may have a similar provision. Is there a possibility that your fuelling dock has those dual flow pumps?
There have been other posts reporting similar issues, so it is worth searching through prior posts both particular power boat models and also general Jeanneau topics. There is a wealth of interesting and useful information there. The search box is very helpful, so give it a try.
Please let us know how you get on.
rene460
ps Hi Crayman, I notice that you do not seem to have had any response to your question from July. I don’t know if you have solved the problem. Again, I would be checking the air vent as another potential flow restriction. I would be worried about installing a one way valve, as that definitely introduces a flow restriction which would cause flow to back up, as there is less than a metre of head available to push the flow through the valve on most of our boats.
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Post by romulus on Feb 25, 2021 10:07:08 GMT
Hi
sorry I didn’t see this point earlier - I listed the same issue in December and got to the bottom of the problem which was fixed. There is a refilling valve system that is designed for Eurpean bowsers that needs to be removed - after that - no issues. Ridiculous that they fit it and VERY dangerous - I had fuel blow back onto hot outboards several times
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Post by erik1095 on Mar 15, 2021 2:50:32 GMT
Thank you for the reply. The fuel vent was the problem. There is a valve in the fuel vent line that was bad. Great call.
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Post by docdav on May 15, 2021 13:33:10 GMT
Hi sorry I didn’t see this point earlier - I listed the same issue in December and got to the bottom of the problem which was fixed. There is a refilling valve system that is designed for Eurpean bowsers that needs to be removed - after that - no issues. Ridiculous that they fit it and VERY dangerous - I had fuel blow back onto hot outboards several times And where is it located? How did they remove it?
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Post by docdav on May 15, 2021 13:34:01 GMT
Thank you for the reply. The fuel vent was the problem. There is a valve in the fuel vent line that was bad. Great call. So where is the fuel vent located? How did they fix it?
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Post by erik1095 on May 26, 2021 2:58:08 GMT
I thought it was fixed. I just re-fueled for the first time and it is happened again. I noticed a little water coming out of my vent opening above my gas fill.
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Post by mikymoon on Oct 21, 2021 14:41:50 GMT
Hallo, I just bought a 1095, and the exact problem is happening to me. any ideas? Thanks
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Post by moonshadow on Dec 10, 2021 20:55:04 GMT
I am experiencing this problem and it is increasing on my SO469 sailboat. Today I traced down the entire fuel vent line from tank to the vent. No kinks and all patent. I suspect the little black valve referenced above. Mine is placed after a vent loop. So from the hull vent my hose goes up toward the deck about 10 inches then forms a loop and then to the valve a bit below the level of the hull vent. After that it goes to a port on my diesel tank next to the filling port. I removed the valve and blew through it. It freely flows air in, toward the tank. And it allows some air out toward the vent but feels partially obstructed. This seems backwards to me at fuel enters the tank at a much faster rate than fuel is removed from the tank. I’m not sure exactly what purpose this valve serves. It might be an attempt to block seawater from entering, in which case it must have a float ball to block inflow when water enters. But that still doesn’t explain the partial blockage of air leaving the tank. The valve is clearly marked “up” and “down” ends and it was installed in proper alignment. One thought I have is perhaps this is supposed to be installed on the “up” portion of the loop? Perhaps it is just failing? Does anyone know how this is supposed to work?
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