P0171/P0174 Help! *yet another update*

Alrighty, more data:

The vehicle is a 1997 Chev. K3500 7.4 / 454

Driving around with an extended fuel pressure gauge has shown that fuel pressure does not appear to be the problem.

A scan snapshot at idle:

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A CSV of log data for a mid sized trip:

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Thanks,

Pete C.

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Pete C.
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fuel pressure test reading on my 1997 suburban key on (engine not running) - about 60 engine running - about 54 key shut off after running - pressure stays up between 54 and 60 for at least 30 seconds.

test your fuel pressure. if the readings are even a little lower than this, you may need a new fuel pump and filter.

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boxing

Ideas?

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Pete C.

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