How reliable are snout extensions for the fuel pump?

We have also had one in use for around fifteen years or so now with no problems at all and lots of street miles. Proper installation prevents problems. File fit where necessary to get everything fitting correctly and then assemble with red Loctite on the camshaft sprocket bolt and it will stay in place and work well.

I have seen a couple complaints about these coming loose, but in reality it was the camshaft bolt itself that came loose and that can happen without these adapters.