O ring size for block fitting for mercruiser fuel rail
#1
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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
#2
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)
VAPOR SEPARATOR TANK AND FUEL RAIL (mercruiserparts.com)




