Go up front and check the eec-iv hook up connector near the brake booster. There is a port on it that if you hook up to ground then the fuel pump will run on it's own, even with the motor off. Otherwise, the computer module controls fuel pump operation, but with the power off, the computer relay would be off too. This works because the wires to the relay are always hot.
You probably got this wire chafed and grounded somewhere.
See attachment. I would check this wire and trace it back (easier said than done) to the relay under the seat.
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91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior
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