Hot Fuel Handling Module

[BIGJWEAVER]

JASON , Ive owned alot of 80 chevys acually all duel tank and never seen one didnt even know it existed but i was fixin my oil pressure gauge and had the dash all apart and lost my fuel pump power, be tracing wires for 5 days now finally found a schamatic for a 87 that had that module on it , i traced the main feed power from pump and found it went to this mod. so i jump wire and everything started working, so i dug deeper found the mod. then found the solder problem talk about a needle in a hay stack.... drove me crazy i began to dought my mech. skills but still dont know what it does? hope somebody can feel us in......