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Jan 23rd, 2013
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Yamaha HPDI problem #13551877 05/09/20 09:36 PM
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JohnnyCakes Offline OP
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I think with your help ou there, I may have found the problem. I found a large water filter near the transom, I got it off and found it was about 33% water, it also had rust and other [censored] floating on the solution I had put in a clear glass bottle. That has led me to change the Mystery filters on the injectors and replace the the water separator located on top of the engine, plus the filter on the side of the engine. Waiting on parts to finish the job and to get back on the lake. Thanks for your help!


PB 9-6
Moritz Chevrolet - 9101 Camp Bowie W Blvd, Fort Worth, TX - Monte Coon (817) 696-2003
Re: Yamaha HPDI problem [Re: JohnnyCakes] #13551892 05/09/20 09:56 PM
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thanks for the post. just reminded me to order a new water separator filter for mine. amazon will have it here Wednesday. glad you got yours figured out!!

Re: Yamaha HPDI problem [Re: JohnnyCakes] #13552697 05/10/20 08:54 PM
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tangledup3 Offline
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After reading your post I ordered all new filters except the water filter near the transom you found which I do not see on Yamaha parts diagram. Am I just missing seeing it ? Curious where you ordered it from.

Re: Yamaha HPDI problem [Re: JohnnyCakes] #13552729 05/10/20 09:35 PM
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SkeeterRonnie Offline
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I bought a Yamaha 10 micron water separator. looks like an oil filter on the gas line. should be mounted on something solid so it can be twisted on/off. amazon has them for ~$25 shipped

Re: Yamaha HPDI problem [Re: JohnnyCakes] #13553332 05/11/20 03:18 PM
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Bahala Offline
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I just listed a bunch of HPDI filter in the classified section if any of you guys are interested. HPDI filters, pump, etc.

Last edited by Bahala; 05/11/20 03:19 PM.
Re: Yamaha HPDI problem [Re: JohnnyCakes] #13553345 05/11/20 03:33 PM
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squib Offline
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Are the water separator filters universal or do I need to crawl under there and find out which one I have? I have been meaning to change mine for 6 months. This post was a good reminder.

Re: Yamaha HPDI problem [Re: tangledup3] #13556476 05/13/20 08:14 PM
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JohnnyCakes Offline OP
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Boat store.com. Sierra 18-7845.


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Re: Yamaha HPDI problem [Re: JohnnyCakes] #13556477 05/13/20 08:15 PM
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JohnnyCakes Offline OP
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They were $7.38 each plus shipping. I ordered 3


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