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Find a fuel pressure gauge and attach it to the end of the fuel rail when the engine has cooled for a while - no pressure. Turn the key to 'on', wait 5 seconds, and turn it off again. The pressure should be above 30psi at that point. Check the pressure again with the engine running, should be 42+ psi.
Turn the engine off and watch the pressure drop. It should drop to 30psi reasonably quick, then slowly drop to 10 or 15 in that many minutes.
The 240 had a return shut off valve on the fuel line, the newer cars have that builtin to the pump - much to our dismay. The pumps are expensive, the shut off valve is cheap.
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Keeping it running is better than buying new
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