Need some help with kamatsu D37ex plz

Hoping maybe I can get some advice on how to turn up the fuel! Recently had fuel tank removed and cleaned, new filters! I got on it for first time today and it has absolutely no power like it should! Sitting in neutral with throttle all the way open and I'm at 1620 rpms! can someone tell me best way to go about turning it up just a bit! Thank you
 
Nathan, Isn't that a Cummins 4 cylinder? We had the lift pump go bad on a Case 550G and would not run right. The 550G also has a Cummins 3.9 engine.
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