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Your funky wrinkled original rubber diaphragm got that way from the ethanol in todays E10 Gas. The original rubber o-rings and diaphragm in aluminum CIS fuel heads are not ethanol tolerant.
The rubber parts in Salvox rebuild kits are ethanol tolerant so E10 gas is OK in them. Maybe you could run E85 in a CIS fuel head with Salvox rubber parts installed if you could modify it to inject wayyy more fuel correctly.
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