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| Please HELP YSB8 Question |
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ssnoc
New member
Username: ssnoc
Post Number: 2
Registered: 09-2010
| | Posted on Sunday, September 12, 2010 - 03:48 pm: | 
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How much pressure should come from the injection pump on my YSB8? I had the pump rebuilt and it squirts out fuel from the high pressure line with the injector off, should that be a super strong stream? I can put my finger over it and hold it back. When I connect the high pressure line to the injector and leave it outside the combustion chamber to check the spray - There is NO spray, nothing comes out of the injection nozel.
There is NO air in any lines I bled them all a million times. I need to be clear on how the injection process works. Does the little sqirts build up pressure in the injector and then it finally mists? Or should the injector start to mist as soon as it gets the squirts from the injection pump? Its got me very confused because the injection shop siad the injector was good, yet it never mists out any fuel.. The high pressure pump is a very simple pump - a needle valve controls fuel level and the cam shaft pushes the plunger. It sends out a "sqirt" with each crank, but no mist from the injector.
How much force should should be in those "sqirts" from the injector pump? And can you please explain to me where this pressure comes from to open the injector and make the mist?
I've been trying to fix this thing for two months and NO one seems to know any of these answers.. Does anyone know?
Thanks! Rob on Long Island. |
larry_from_maryland
Senior Member
Username: larry_from_maryland
Post Number: 422
Registered: 07-2003
| | Posted on Monday, September 13, 2010 - 11:56 am: |
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What make engine? The pump needs to put out a higher preasure than what the injector is set at.Sounds like its not makeing a high preasure. |
ernie
Senior Member
Username: ernie
Post Number: 1265
Registered: 01-2002
| | Posted on Monday, September 13, 2010 - 05:57 pm: |
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Larry its an early Yanmar with a pump style you may not have seen. No rack to control fuel just a needle valve to create a leak.
Yes it must make pressure above the injector pop pressure and won't if the needle valve isn't completly closed |
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