Project input or help with a dilemma please

Yup. Too big by atleast 1/32". Also, I'm convinced the valves they're selling aren't genuine MOPAR.

Is the purpose of the fuel safe sealant to protect the silicone tape (such as using an epoxy) or provide additional sealing (such as #2 non-hardening)?
Helps it to slide in without tearing the fusion tape.
 
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