Re: [Amel Yacht Owners] GENSET ONAN CUMMINS cannot restart after fuel filter and oil change


Bill Kinney <greatketch@...>
 

Alexandre

I am trying to understand what is going on here…  If it really is possible to syphon fuel out of a half full tank via the return line, then putting a shut off valve on it would become become a very high priority safety project for me.

 But if the tank is built the way Amel drew it, then it is not possible for this to happen without “magic”, and we are seeing something else happening.

You describe a “drop by drop” leak of fuel.  How much total fuel leaked this way would you guess?  10 liters?  5?  Less than 1?

Bill Kinney
SM#160 Harmonie
Port Canaveral, Florida

On Jun 16, 2016, at 06:44, Alexandre Uster von Baar uster@... [amelyachtowners] <amelyachtowners@...> wrote:

Good morning Bill (SM #160), 

April 28, 2015 in reply to Mike Ondra’s post, I reply: 

my injectors (engine) were removed to be check/rebuilt
Somehow fuel was still coming drop by drop in the bilge compartment. 
It did not make any sense to me as the valve was off.  
I realize the fuel was coming from the “return” valve (which still doesn’t make any sense… may be some type of suction or syphon?)
So I disconnected the return rubber fuel line to the tank, the leak stop.  

My tank was may be 1/2 full.  

It happened to other people as well.  

One of these things hard to understand but that you have to keep in mind.  

Sincerely, Alexandre
SM2K #289 NIKIMAT
Club Nautico de San Juan, Puerto Rico

--------------------------------------------
On Wed, 6/15/16, Bill Kinney greatketch@... [amelyachtowners] <amelyachtowners@...> wrote:

Subject: Re: Re: [Amel Yacht Owners] GENSET ONAN CUMMINS cannot restart after fuel filter and oil change
To: amelyachtowners@...
Date: Wednesday, June 15, 2016, 9:21 PM


 









I am puzzled…  
How can the fuel “syphon”
back from the tank through the return line?  Amel’s
drawing of the tank does not show a dip tube (and there
certainly shouldn’t be one!) on the return fitting on the
top of the tank.  
It seems that if the only way
this could happen is if the tank is filled so full the level
is up into the fill line with NO air in the tank at
all.
Bill KinneySM#160 HarmoniePort Canaveral, Florida



  


On Jun 15, 2016, at 21:41,
amelliahona <no_reply@...>
wrote:
Dominique:
I just replaced my electric
priming pump on my SM #335 Onan Genset.  I did not have
access at the time to a proper FLARE NUT WRENCH when I did
this.  I ended up distorting the "B-nut" on the
small copper fuel line that goes from the fuel pump to the
fuel filter adapter and could NOT get a proper seal upon
replacing this line (a continuous small seep of fuel that
was really annoying and messy).   I had to order a
replacement line (not that expensive) and buy a proper set
of flare nut wrenches to adequately get a seal.   I wish I
could remember the size of the flare nut but it was SAE (not
metric) sized.    Make sure the fuel tank is low on fuel
(think 250 liter will work) otherwise a continuous stream of
fuel will flow by syphon from the fuel tank fuel return line
while you make this plumbing change.  I managed to turn
this otherwise simple replacement into a major project based
on A) not using the proper tools to loosen and re-install
the B-nut of the fuel line, B) not have lowered the fuel in
the tank (mine was full at the time of my work).
 
Good luck.  The pump was about
$65 as I recall (not that expensive in the scheme of things)
and the fuel line was about $8
Sincerely, 
Gary S. Silvers/v LiahonaAmel SM #335    Puerto
Rico 











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