Fuel blockage on seafari

[Capt Terry]

Originally Posted by Oldboat

I’m am not a materiel engineer but when I google aluminum and stainless togeather it’s says the 2 act like a Bettery and cause Corrosion .

Yup, many of us have broken and had to drill SST bolts out of aluminum. it's particularly a problem in moist or a salty environment. In the 70s on jet engine design we used wet zinc chromate primer on SST fasteners threaded into aluminum. Often this wasn't foolproof, so tried to design for enough material around the fastener that it could be drilled out and a helicoil or different type of internally threaded insert could be used to repair the hole. I often use an anti-seize compound with SST threaded into aluminum.

Brass is closer to aluminum on the galvanic series than any of the SSTs and therefore it's a good choice in aluminum. The 400 series SST are closer to aluminum than the 300 series. But I considered the 400 series as the rustier SST , those that would flunk my magnet test and I would try to avoid for boat hardware.