Easiest way we found was to put a pressure gauge inline at the fuel filter.
If you don't have access to a pressure test set made to do this try
borrowing one from a garage if you know someone. Our 89 had 5-12 psi old
pump (1 year old) with a new pump it sits at about 16 psi...
Our 92 was low and we found the spring was broke in the regulator.
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