You can test your fuel pump by energizing it from the ALDL connector. Putting a pressure gauge on the fuel rail beforehand will indicate if the pressure comes up to spec and if the pump is functioning properly.
Terminal G is used to test the operation of the fuel pump without removing the tank or unplugging the relay.
Apply 12 volts directly to terminal G and the fuel pump should run and have pressure at the fuel rail.
------------------ " THE BLACK PARALYZER"
-87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite. "THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
[This message has been edited by Dennis LaGrua (edited 01-10-2021).]