Brian,
There is a factory test that checks fuel pressure right at the pumps, but it requires a special fitting that you will have to order. This test is really only for premature failure. If you only had say 20k on this car new, and the pumps failed, you could tell which one to replace. It is an old axiom in the business that if you have two calipers, or two shocks, or two fuel pumps, or whatever you have two of, when one fails, the other isn't far behind. Also you need to deal with it before the extra current draw takes out the fuel pump relay.

Peter

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