I believe that 30 is the power source (hot in start or run), and 87 is the output to the fuel pump. If you jumped 30 and 87 with the ignition on and the pump still didn't work, then your pump is bad or you have a wiring problem.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe