Your attitude, I think, is the right one. You're aware of a fault with an essential part - the fuel system - of your aircraft, and therefore you should avoid flying until that fault is rectified. Of course, the loose chain is very unlikely to cause a problem in flight, but who knows what else might go wrong: What would happen, for example, if the fuel filter became damaged? What if it already is? Maybe you'll become aware of it in a catastrophic way.
Many faults on their own can seem harmless, and probably are. But combined with another equally unlikely problem, it could just become very serious. Don't take chances with maintenance - each could be your last.