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Old age? USLD or biodiesel? Water corrosion?

Thankfully this cleared it up, a new pump is too expensive!
 

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A little indicator that I remembered: if the tiny torx screws that hold the fuel temp sensor are corroded or other items under the top cover of the pump, then you have a water problem in the fuel.

I had an issue which was traced back to a wire that had rubbed through. On the wiring harness.
 
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