2337BRAT

Attempting to replace the Fuel Filter on a '78 Brat and want to run the fuel out of the line....I took the fuse out from the main breaker (driver's side) labeled "IG ST FUEL" (5th from the top) thinking that would do the trick and disable the Fuel Pump but the car wouldn't run out of gas. This is a brand new car to me and there is a bit of secondary wiring, but is there another trick to turning off the pump that I am missing? Thanks!