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Congrats. Thanks for the follow up. Have you verified across several days of sitting?

Aftermarket has adjustable ones as well. Tork is one company. Did you remove yours and test/inspect it? Cummins part number 3912886, $34. https://oregonfuelinjection.com/shop/heavy-duty/perkins-industrial-ag-and-marine/valve-ofv/ Free Cummins Quickserve online p/n and service manual:

http://www.lmgtfy.com/?q=Cummins+8.3+overflow+valve The injection pump is independent of the engine type it is on. Follow what you are finding for the P-7100 on 5.9’s, and the MW pump on the 8.3L will be identical...

OK, good luck.

Yes, FSOV is Fuel Shut Off Solenoid. It may be working, but as batteries age, their voltage when cranking drops. Starter will still work perfectly, but FSOV will close while cranking. You are unable to see this from the cab as a single person. Pull it back and zip tie it to test, or just...