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Originally Posted by Edbrooks
Can you hear the pump running when you first turn on the ignition? If you can, the pump relay is OK. Disconnect the fuel line at the fuel rail (be sure not to lose the o-ring! Take it off and put it somewhere safe for the moment!) Have someone turn the ignition switch on while you put your finger over the end of the fuel line from the pump. If you get substantial pressure, (it will force your finger away) the pump is working and the problem may be in the fuel pressure regulator, allowing all fuel to return to tank. If you get no fuel, or very low pressure, easily stopped with your finger, the pump is not pumping correctly, which seems to be your problem.
Inside the gas tank the pump connects to a short hose that runs to the fitting plate where the pump is mounted. That hose is held on with stainless steel hose clamps and is inside the gas tank. Those are screw type clamps. If one is loose, the pump simply pumps gas in a loop inside the gas tank. Fixing - or checking for - the problem requires removal of the pump from the tank and tightening/checking those clamps.
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I put a new pump in and I know those clamps are tight. I also checked the fuel pump relay (on the 89 there is a bank of 4 relays right behind the electronic ignition module), I switched the relays around and it didn't seem to make any difference. I've always been able to hear the pump when I turn the ignition on, in fact it was loud, but I cannot hear the pump at all now, that's why I replaced it. This is a big mystery to me. Any ideas? By the way, the one thing I've been thinking about is the possibility that the polarity is not correct on the pump itself (inside the tank) is it possible that the polarity being reversed could keep the pump from pumping? If so, I can just disconnect the line outside the tank and switch the polarity to check. Just a thought.
Thanks for your input.
James