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Leaking injector


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Recently the boat has become quite smelly after a period of motoring. I think I've narrowed it down to a leak on the high pressure side at the injector - see photo.

 

Just wondering if its a good idea to snug it up or do i need a pro? If tightening it up is the the upper or lower nuts?

 

All thoughts appreciated. ..

20180331_152439.jpg

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The upper nut. The one with the line going directly into it. Give it a nip up. The lower one is the return line and has no pressure.
Then give the nuts a wire brush and spray a little protective paint around them to stop rust destroying the threads.

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