What is RFI filter and does it go with fuel filter for 99 escalade?

NOISY FUEL PUMPS CAN SOMETIMES GET PICKED UP BY THE RADIO (RADIO INTERFERENCE) RFI FILTERS MOUNTED ON FILTER SUPPRESS ANY ANNOYING FREQUENCY NOISE. I FOUND MY ANSWER BY GOOGLING MY QUESTION. 99 ESCALADE EXPORT MODEL HAS A RFI FILTER ; A NON-EXPORT MODEL DOES NOT. EXPORT MODEL HAS A CODE OF 'GFV' TAGGED ON PUMP AND HAS A RFI FILTER.