switch it with a relay that works, like your horn relay or simulate the relay with fused jumper with 12 volts from your battery. 87 on your relay is your out to the fuel pump. putting 12 volts to the point of contact where 87 would be should start your fuel pump.
check fuel delivery
Swap the relay with another like relay.
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Swap the relay with a known good one.
Check fuse and/or relay.
Check
A Chevy Avalanche uses standard 87 octane fuel. Higher grade fuel will not result in improve mileage or performance.
Chevy did not use a reset button/switch. You need to check fuel pump fuse and relay first. Then check the fuel pump itself.
Check the fuel pump fuse.
No there is not, Need to check the fuel pump relay and the fuse.
Chevy does not use a fuel cutoff inertia switch.
check fuel pump relay!!