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Old 08-09-2010, 05:08 PM   #1 (permalink)
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Reference Material: Turning Up Your Injection Pump

So, you've all heard about your buddies cranking up the fuel on their 12 valve Cummins, right? Ever wonder to yourself "Wow, I wonder if I can turn up my fuel to make some more horsepower?" Well if you have, the answer is yes. Unfortunatly, the biggest gains are reserved for 92-93 6.5's that have the mechanical Stanadyne DB2831 rotary injection pumps.

First, for the mechanical engines. This process is the same as for the 6.2. This thread and this thread will both give you a list of procedures to follow to increase your fuel rate, also known as turning up your pump. A great video guide for the process can be found in this thread.

Now, for those with the 94+ DS4831 Stanadyne injection pumps, there are only little tricks to slightly increase the fuel rate, but nothing like "turning up the pump" as in the normal sense, like the 6.2's, 92-93 6.5's, and Cummins. To get the gains that the 92-93 trucks will see from turning up the pump, you will need a reflashed PROM for 94-95 or PCM for 96+. For those little tricks I mentioned, the main one is called the optic bump. This requires removal of the pump cover, similar to the DB2 process. This thread explains a little bit about the bump and what exactly is happening with it. This thread, this thread, this thread, this thread, this thread, and this thread contain some info on the procedure to doing the optic bump. The other little trick is the calibration resistor in the PMD. These are used for final pump calibration, and result in a very, very small amount of fuel increase. The ones we run are numbered #1-#9, with #9 offering the highest fuel rate. The difference is very minimal though.

Now you have a good idea of how to increase your fuel rate, or "turn up your pump". Just keep in mind that you're still not going to compare with your buddy's Cummins, but you will have a little more fuel, and power. Take much care while doing these suggestions and follow all safety precautions.

A 6.2, a 6.5, an LB7, and an LML.
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