Hello,
Sorry for delay in responding not sure how missed your post.
Anyway, yes the fuel rail seals can cause the problem do to it affecting the fuel spray pattern. If seals are leaking letting in extra air then it will affect the spray pattern and fuel air ratio.
As far as checking fuel pressure you can check it at anytime not just after changing the pump.
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Friday, August 13th, 2010 AT 9:21 AM