Aftermarket EFI and dual internal pump tanks

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Hunter79764

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Joined
Sep 1, 2021
Posts
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Location
Grand Prairie, TX
First Name
Shawn
Truck Year
1987
Truck Model
Suburban V20
Engine Size
350
Stole this from another post, but according to this, the 87+ selector controls the TBI in tank pumps, you could easily have it trigger a couple of relays to keep the current out of the factory selector but still maintain just the factory switch. 920 - Tan would give a 12v signal to your supplied relay to handle the current to the aftermarket pump in the Left tank, and 921 - gray gives 12v to the Right pump.
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