Gauge reads zero, but I suspect......
What if your suspicion was wrong?
And that's exactly why I landed there, instead of continuing to my destination which was only another 50 miles or so.
As you say, I was being very conservative, more so than I needed to be. I had plenty of evidence that all but ruled out a real fuel leak and was really playing "what if I'm wrong".
Most importantly, the gauge had been reading normally 2 minutes earlier and then suddenly read zero. "Normally" means about 3/8 full, which translates to somewhere between 15 and 20 gallons. I had just gone through some turbulence over the mountains and I'd seen that gauge rock back and forth and even momentarily hit zero before under similar conditions.
15-20 gallons of fuel is a heck of a lot to lose in 2 minutes without being aware of it. Also, that's about 100 lbs or more disappearing from one side. The plane didn't feel at all unbalanced. No fuel odor in the cabin, no drop in fuel pressure. Just the gauge reading zero.
The chances that it was anything but a gauge malfunction? You can judge, but I thought they were pretty close to zero.
Being a conservative pilot I just wanted to check it out and make sure.
I didn't expect ATC to necessarily be on exactly the same page based on what I had told them, but they did ASK me whether I wanted the tanks rolled. That implies to me that it wasn't a mandatory emergency for them. What it comes down to, for me, is that they didn't respect my PIC judgement.
No need for you to get defensive, you didn't do anything wrong, in fact I think you were probably more conservative than you needed to be. At the same time so was the controller. Being extra cautious on both sides of the radio is rarely a bad thing.
That's a good assessment, but I still think controllers should be there to assist the pilot, and not to take matters into their own hands without clear evidence that the pilot is not using good judgement or treating a situation with the seriousness it deserves.