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As previously mentioned, there is no OEM all-inclusive rebuild kit from OMC.
Vintage Outboard has a compiled kit Johnson/Evinrude pressure tank repair kit #JEPT54 aluminum knob primer – VintageOutboard.com.
Amazon has an inexpensive kit, but you will need to make the ninth hole for the plunger. Amazon.com : EMIHO 2 Line Pressure Tank Rebuild Kit Compatible with Johnson Evinrude OMC, 15 Pcs : Sports & Outdoors
As you can see, the aftermarket kits vary quite a bit regarding what all is included.
Most of the time, the cap washer and the sight glass washer can be reused. The originals are made of nitrile rubber, not cork. Take note that the sight glass washer has a tapered OD. The larger OD end seats on the glass magnifier.
If you cannot reuse the screw seal washers, and prefer fiber washers, let me know and I will find some that work.
As Richard stated, be very careful to not lose the tiny round aluminum check valve disk. That tiny disk corresponds to a hole in the diaphragm and it’s very easy to install the diaphragm upside down. Yes, that was learned the hard way.
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