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O ring size for block fitting for mercruiser fuel rail

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O ring size for block fitting for mercruiser fuel rail

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Old 12-17-2023 | 06:06 PM
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Default O ring size for block fitting for mercruiser fuel rail

I have a gen 6 454 mag mpi gen 3. There is a brass block with 2 o rings that go into the port side in the middle of the fuel rail. The schematic only shows 1 in the drawing and says 1 required. Any idea if they are the sane size? I'm assuming yes but my eyes start playing tricks on me. This is the part number listed 25-805970
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Old 12-18-2023 | 12:32 AM
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Guessing you have a VST system?? By the looks of the diagram, you would need one O ring for each hose that goes into the end of fuel rail

VAPOR SEPARATOR TANK AND FUEL RAIL (mercruiserparts.com)
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Old 12-18-2023 | 04:59 AM
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No vst. Cool fuel. Schrader valve at front end on fuel rail. Fitting in the back is plugged
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