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Discussion Starter · #1 ·
I just put a new injection pump on a 1990 non intercooled cummins. The engine starts and idles fine but wont rev more than a couple hundred RPM's. If I plug the fuel return from the injection pump it will run like its supposed to. Please any and all help and advice is greatly appreciated.
 

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Discussion Starter · #2 ·
After several days of thinking and working on the problem I finally found my problem. When putting the injection pump and lines back on I mistakenly put a restrictive fitting in both the return line and the line leaving the fuel filter. There should only be a restrictive line on the injection pump return line. Hopefully my mistake will help somebody down the road.
 
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