Dual tank switch kills the engine

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WP29P4A

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Joined
Jul 18, 2021
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890
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Location
Nevada
First Name
Mike
Truck Year
1987
Truck Model
Sierra Classic V1500
Engine Size
350 TBI
The 87 trucks with TBI have a test lead connected to the fuel pump relay to test the pumps. Flip the switch to the tank you want to test and apply power to the connector and listen for the pump. Flip the switch to the other tank to test the second pump.
 

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