Hi Steve,
Pretty sure my Facet Interrupter is a red top also. What you describe sounds right to me. The pump is a lot noisier at first as it primes the lines / regulator etc then quietens down when the fuel is all where it should be.
I also used several cubes over the years so know what you mean about the difference.
Shane.
yeah it's weird. They all are noisy to start with as they are dry I guess. Then quiet up when they get fuel in them. But it's the speed that it pumps that changes dramatically that confuses me. Even the Silver top which is the same shape (Can style) kept the same speed throughout. Perhaps it's because it's a bigger pump? it doesn't need to go mental all the time? less pumps for the same flow?