Fuel pump relay location

Does not matter. Main thing is that the wiring to the relay contacts is fused close to the source and large enough for pump current. Same with wire from relay to pump

Keep in mind "this is a good time" to think about oil pressure and or crash switch, and or a security (anti theft) switch in the coil (trigger) circuit

Also keep in mind many replacement relays are not particularly water resistant, so underhood "splash" might be a problem

Also check the relay coil for protection diodes. The "Bosch" copy / look alike relays seem to come both ways. If you hook the coil up reversed, you create a dead short

The way this one is wired, pin 86 MUST be positive, and 85 must be ground

http://www.bcae1.com/images/jpegs/IMG_7451b.jpg