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Forgot to drill the hole for the fuel pump? Sounds like the time I spent an hour figuring out why my dishwasher wasn’t draining into my new garbage disposal. I forgot to punch the plug out! 🙂
The total for this mod was about $60, not $90. I looked at a lot of different fuel pumps. For 25hp+ motors, new OEM pumps were $90, Sierra about $75. The Chinese eBay & Amazon knock-off pumps were $12-15. Fearing being stuck in the middle of a lake at some point, regretting purchasing a $12 Chinese fuel pump, I decided to go for a nice-looking used OEM pump and an OEM re-build kit for it. With shipping, the fuel pump and the rebuild kit for it was about $35. I also purchased a 1959 Gale 25hp bypass cover, part 304646, that was set up for a fuel pump for $15 with shipping. As far as I understand, it should fit my RD-15. I could have made an aluminum plate like the one you pictured above, but this sounded easier. Then with hoses, a bypass cover gasket and capping off the intake nipple, we’re at $60. But… I do think this will be worth it.
This is the fuel pump I purchased.

Thanks for the encouragement!
I showed this mod to a neighbor with a 1959 35hp Evinrude Lark over the weekend, and he was excited to make similar modifications ASAP. 🙂