2000 Honda Accord lx cutting out, is it the fuel pump?

I strongly recommend taking your car to a professional technician for help with this problem. Fuel pump is a total guess at this point--you are going to put serious time and money into trying to fix this, and the money at a shop would be well spent.

If the problem started right after replacing the timing belt, the timing might be off. Very easy for a mech to miss a tooth on the gears when putting on the belt or not lining up the gears properly. As far as the radio code goes, if not in your paper work, sometimes a sticker is place in different places of the vehicle with the code on it: i.e. the glove box, the door jam, the fuse box cover, or even under the change drawer on the driver side of the dash.