Have you thought of fitting a supressor to the fuel pump?
As has been mentioned, make sure that the radio wires are isolated from the other wires. ie in a different loom run alll together.
You also need to check equipment is earthed / bonded. Just because they are connected it does not mean that there is an electrical path. I've seen equipment that have been treated or painted so that you cannot get an electrical path. I've even seen earths fitted to plastic boxes!