elec. fuel pump relay wiring diagram

Agree. If a 5th wire, it is usually "87a", which is "normally closed". But, you might have a special fuel emergency shut-off relay. Photos help when asking such questions.

Be careful about polarity for 85 & 86 since it can matter. Sometimes the relay base will have a clamping diode, and many relays do. Sometimes they use a resistor instead, in which case polarity doesn't matter. Seems like I have seen "86" as ground in some documents (Radio Shack's bubble pack?). The numbers are a Bosch standard, that applies to many electrical devices besides just relays. You can find the list online. You can also find tutorials online. One discusses the coil polarity and some surprises they found.