I had a similar problem, one fuel pump was disconnected. The car didn't run well before I found this problem and it didn't run well after I fixed it. I kept checking the duty cycle on the diagnostic connector but it didn't have one, so I got a replacement ECU. It's wtill not running well and right now, the car is sitting.
As for the original question, it depends on which one. If the lower pump is not running (well), there won't be any fuel pumped to the second pump. If the second pump is not running, some fuel will make it past the second pump from the pressure of the first. It still won't run well.
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Regards
Warren
Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor
Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL
ENTER > = (HP RPN)
Not part of the in-crowd since 1952.
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