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post #41 of 54 Old 10-04-2012
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Re: no start Yanmar

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Casey..! Thanks ever so much for that advise.! Will try again and get a Yanmar expert to look over my shoulder.! Never ever had this much trouble with all my years with Cat engines.!
Best Regards
Dick Rawlings
Good luck, Let us know what happens. The main thing this Yanmar's are sensative to air in the system and to any air leaks.
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post #42 of 54 Old 10-09-2012
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Re: no start Yanmar

Question.! ..anyone know if by using a electric fuel pump on a Yanmar 3Jh3e, in line for bleeding and as a standby in case of mechanical failure, with a 5-7 PSI rating could hurt the diaphragm on the mechanical pump. Some have suggested that this could cause fuel in crankcase. A 2-4.5 PSI pump is available at a much higher cost and delivery time will keep me dockside yet another week. Am anxious to troll-sail for Rockfish in the Chesapeake while the wife is in good humor and busy with the girls.!!!
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post #43 of 54 Old 10-09-2012
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Re: no start Yanmar

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Originally Posted by Ameridacusa View Post
Question.! ..anyone know if by using a electric fuel pump on a Yanmar 3Jh3e, in line for bleeding and as a standby in case of mechanical failure, with a 5-7 PSI rating could hurt the diaphragm on the mechanical pump. Some have suggested that this could cause fuel in crankcase. A 2-4.5 PSI pump is available at a much higher cost and delivery time will keep me dockside yet another week. Am anxious to troll-sail for Rockfish in the Chesapeake while the wife is in good humor and busy with the girls.!!!
Here is some info:



The Diesel Page, Electric Lift Pump and Racor Filter installation

Paul T
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post #44 of 54 Old 10-09-2012
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Re: no start Yanmar

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Originally Posted by Ameridacusa View Post
Question.! ..anyone know if by using a electric fuel pump on a Yanmar 3Jh3e, in line for bleeding and as a standby in case of mechanical failure, with a 5-7 PSI rating could hurt the diaphragm on the mechanical pump. Some have suggested that this could cause fuel in crankcase. A 2-4.5 PSI pump is available at a much higher cost and delivery time will keep me dockside yet another week. Am anxious to troll-sail for Rockfish in the Chesapeake while the wife is in good humor and busy with the girls.!!!
On my Yanmar 3gmd (it also has a low pressure mechanical engine mounted pump) I installed a hand primer bulb (one you would use on a gas outboard engine). I pump the bulb to prime the engine (actually put a fuel line that connects to the fuel return from the engine with valves so I can prime the entire line without having to catch the fuel in a bucket). If the mech fuel pump stops working I might be able to use the fuel bulb to pump fuel to the engine.

I would be hesisant to use an electric fuel pump as it could send fuel into the engine if the mech fuel pump diaphram breaks. Also, in case of fuel leak it would fill your boat with diesel. I would carry (and I do, a spare mech fuel pump).

However, a lot of people do use an electric pump for priming their engines.
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post #45 of 54 Old 10-09-2012
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Re: no start Yanmar

Thanks so much for all the help..! I am new to this forum page and trust I am sending this in the correct manner. Pls respond to verify if it's done right.!
Much appreciate this quick help.
Dick Rawlings
Oxford, MD
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post #46 of 54 Old 10-10-2012
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Re: no start Yanmar

Is it possible that one of the cylinder de compression levers is in the de compress position?
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post #47 of 54 Old 10-11-2012
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Re: no start Yanmar

...thanks for that tip..! Never crossed my mind. Inwill most certainly check that out. Have spent more hours fuming over this toy engine than all my years with 600-1500 HP Caterpillar engines COMBINED..!!
have finally given up and fir the first time broke down and have called for "professional help"...from men schooled on this "little grey beast"!
...darn..!... If it was just painted Cat yellow"..!
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post #48 of 54 Old 10-18-2012
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Re: no start Yanmar

How's the engine going?
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Re: no start Yanmar

Gave up after 10 hours of bleeding the toy engine. Installed a electric fuel pump 2.5 to 4.5 psi. Works great. But engine still not cooperating. Runs on either, which is not good. Now only 1-3 are squirting fuel. Nothing from #2. Have a full-fledged diesel man arriving on Saturday. Promises to stay with it until it runs....so I'll have to wait and see. Will let you know the results. Never ever had so much trouble with a diesel engine.
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Re: no start Yanmar

good luck..
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