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If you bypass the ECM power feed to the transfer pumps and go with 12 volts directly you run the chance of kicking the processor on the VP44 into its failsafe mode if you drive it that way. Doing the bypass for a test is just fine, as that will narrow the possible failure point, but try to not drive with the voltage bypassed.
If you are a road salt state, I would check my grounding lugs for the aftermarket fuel pumps.
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