Oooh, that brings back some horrible memories!I used some aerospace fuel tank sealant to repair a cracked carb diaphragm ages ago and it worked great.
Maybe this
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PPG AEROSPACE HIGH STRENGTH FUEL TANK SEALANT 100ML SEMKIT PACKAGE READY | eBay UK
This system is ideal for epoxies, polysulfides, polyurethanes, silicones and other materials which require dynamic mixing. (30cc) to 20 oz. A chemical composition formulated for coating or for filling voids, cracks, joints or seams of objects and/or materials to exclude foreign matter and/or...www.ebay.co.uk
DO NOT get it on your fingers
Personally in the interest of science I would use the repaired one to see how long it lasts but keep the spare in the boot with tools to change it if needed while out and about








