Sounds like a injector is bleeding off on hot soak. Not all that unusual. You can pull the injectors and take 'em to someone who has a bench tester for testing. (and sometimes you can fix 'em this way as well, blows the trash out)


I've run into a few slightly leaking fuel pump check valves doing this as well, but that is normally accompanied by a hard start on hot soak, some black smoke and skipping on start.44K is a great product but, 40psi is not enough to dislodge the trash most of the time.



Joe

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Raleigh NC
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