About the only RFI capable of being heard on an FM radio (assuming it is properly designed), is that caused by the high-pressure fuel pump. They're piezo controlled, and their output does have some FM deviation. It sounds like a slight purring sound (not unlike alternator whine). Since it is also switched off and on, it is possible for it to generate a popping noise similar to ignition noise.
Is there a cure? Maybe, but you have your work cut out for you, as you have to remove the pump (it's in the fuel tank). You can put ferrite cores (mix 31 is the best) on the wiring harness, but you might not be able to get rid of all of it.