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Codes, codes and more codes. Don't know where to start..


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Get a scan tool and erase the codes first, then drive it around for a bit, or start it up and see which ones return.The P0237 is an over boost code, not to worry too much yet.The P0251, P0252 mean that you are needing to get a new VP 44 injection pump because the internal moving parts are broken/stuck. You might try some 2 stroke oil in your fuel to see if that helps the codes. As the 2 stroke will add lubrication to the fuel for the VP. For your use, you might try 1.5 ounces to 1 gallon of fuel for the first tank. Then go to 1 oz to 1 gallon for the rest.The P1688 means there is an internal failure in the VP.The P1693 is just a companion code to tell you there are other codes set in the PCM/ECM. Not to worry about.The codes that have me concerned are the P0251, P0252, and the P1688, these are generally the death codes for the VP.Others will chime in.

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Thanks MM!! Looks like DAP has the best kit deal. Who would you recommend? Also, where would you recommend purchasing a low pressure fuel gage kit?

Try looking at manufactures... http://mopar.mopar1973man.com/cummins/manufacture/manufacture.htm Then check out the vendors... http://mopar.mopar1973man.com/cummins/dealers/dealers.htm
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