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yamaha hpdi vst experts please help

Old 06-23-2015, 03:41 PM
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Default yamaha hpdi vst experts please help

I replaced the fuel pump inside my vst today, and now I am getting fuel leaking out of the top of the vst where the electrical connections are made (the brown insolators). Any clue what can be wrong? It all wen back together smoothly. Not sure what to do. I have not tried to start the motor with it leaking. When I turn on the key, I hear the pump run, and that is when I saw the fuel leak. Thanks for any insight.
Old 06-23-2015, 04:59 PM
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Can't picture the connections off the top of my head but did you replace the gasket between the parts of the VST? The existing one is hard to reuse again once it's out outside of trying to freeze it to get it to shrink back in size.
Old 06-23-2015, 05:16 PM
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Are you sure its leaking at the electrical connection points on top and not from the gasket. Just replaced my VST yesterday ( 07' 200 hpdi) and had to use a new gasket as the old one was a bit bigger to fit back on. You can clean them off and put in freezer to shrink back to shape in a pinch but usually not worth it. I replace a HP fuel pump a couple of years ago and I think those connection points on top are solid if they are actually leaking something is cracked. Recheck the gasket thats your problem. Hopefully.
Old 06-23-2015, 05:54 PM
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Pull it apart again, I would replace orings on the 2 posts or chance an explosion
Old 06-24-2015, 12:10 AM
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Yep, pull back apart and compare the orings and spacers with the factory parts list.

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