85 & 86 are just the energizing signal wires, one goes to ground, the other goes to the switching source. there is no right or wrong on which one goes to ground and power though I usually apply power to pin 85 and ground to pin 86
the same with 30 and 87. theoretically either one can be connected to the power source and the other to the pump. Conventionally 30 would be the power source (battery or fuse box) and 87 would be to the fuel pump as it has no power (normally open) until the circuit is energized. 87a only has power when the relay is not energized (normally closed).
It is true that the blue is commonly the signal wire source BUT if a red wire was used it could confuse someone to think that the blue was a ground.
In 120VAC wiring in newer appliance and tools and such there is a brown (hot) and blue (neutral) wires. So that could cause some confusion, not saying that is the case, just throwing that tidbit of info out there.
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