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You should get fuel pressure just by turning the key on since the pump is electric on the 1990. Yes, the relays do go bad (unfortunately, so do the pumps). The relay should be under the hood on the firewall on the passenger's side near the cowl. It's pretty easy to change. Check the fuse too. Sometimes thumping on the bottom of the fuel tank can kick start a failing pump. I don't believe the computer will generate a code for a bad pump.
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