This is how thread sealant is used:
The listed sealants are suggestions with long service histories. You'll also find the brands suggested in the Vans builders manual. The actual choice is the builder's responsibility.
They are non-hardening sealants, meaning they don't tend to form solid chunks. A good sealant is easy to clean from female threads, which must be sealant-free each time a male fitting is inserted. Failure to clean the female threads can allow the male to push cured or uncured sealant further into the fitting, which may form a blockage.
The point is to avoid something like you see below, in which a poor sealant choice was sheared loose into the fitting, resulted in loss of fuel flow.
The listed sealants are suggestions with long service histories. You'll also find the brands suggested in the Vans builders manual. The actual choice is the builder's responsibility.
They are non-hardening sealants, meaning they don't tend to form solid chunks. A good sealant is easy to clean from female threads, which must be sealant-free each time a male fitting is inserted. Failure to clean the female threads can allow the male to push cured or uncured sealant further into the fitting, which may form a blockage.
The point is to avoid something like you see below, in which a poor sealant choice was sheared loose into the fitting, resulted in loss of fuel flow.
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