Try a filter capacitor
rvmv-
May not hurt to try installing a filter capacitor close to the fuel pump and see if that helps with the noise issue you are experiencing.
If you are running a 12 volt electrical system try finding a 22,000 uF capacitor rated at 25 volts and attach the + lead on capacitor to the 12 volt power wire to the pump (try to make this connection as close to the pump as possible). Attach the - lead on the capacitor to a good ground point near the pump.
You could try playing with the capacitor size ... but guessing 22,000 uF would be in the ball park for what you are trying to accomplish. Others may chime in on what has worked well for them.
Electrical noise can be tough to eliminate ... it is almost black magic ... trial and error.
Good luck.