Originally Posted by Bart Timothy

I don't work for an injection shop and I don't work for Bosch. What I know about these pumps comes from 7 years of being in the diesel scene, listening, watching, and trying to figure out things myself. I don't buy into much of the ignorance and pure speculation which abounds on these forums when it comes to VP44s and lift pumps. A few talks with pump rebuilders and Cummins engineers has helped out quite a bit, and spending several hours in Industrial Injection's VP44 room hasn't hurt.

If all you did was go in and clean things up inside the pump, and change out gaskets and seals, put it all back together again, there appearently must not be a problem in rebuilding it yourself. What part the PCU plays in pump calibration when it comes to, say, changing out the distributer assembly, as an example, is an answer which isn't known. The rebuilders may not even know the answer to how dumb the PCU is, and how much programing is needed to tell it about the small variations of the hardware which it controlls. A new PCU may not know anything, and may have to be programmed from the ground up when installed. The rebuilder is usually going to go through a rebuild proceedure taught to him by Bosch.

There are different numbered pump gear keyways which are spacific to individual pumps. The 3 digit keyway number must match the 3 digit number stamped on the pump. When the pump is rebuilt, the test stand software tells the rebuilder which keyway number to use, and that number is stamped on the pump also. Knowing this information says that there are some calibrations which will be out of the hands of a backyard rebuilder.

Another interesting tidbit is the PCU has memory registers which can tell Bosch and its rebuilders all sorts of things about pump operation. For example, the test stand software can tell the rebuilder if a fueling box has been used, even if the the Blue Chip cover was involved.

Thanks for posting your information, because I've learned something from you.

Originally Posted by my3sonsracing

An update if anyone is interested.
I did find parts for this pump - gasket set is $37 and the electronics pak is $374.
There is no magic diaphragm that rips as some people have reported. There are solenoids that control the fuel flow and that is usually the culprit for dead pedal. In addition, the housings simply wear out due to a lubrication problem that Bosch has not fixed. that is why the Lift pump is so important to maintain good positive flow through the injection pump.
There are only a hand full of rebuilders in the US that have spent the $150k to buy the test stand to set up the pump. That is the issue with a do it yourself fix - the electronics have to be programmed on the stand to communicate with the ecm.
I have ordered the gaskets and am going to rip it apart and see what I can do with it. Who knows, maybe I will find a simple fix that the rebuilders don't want us to know about!
I will keep you posted.

Originally Posted by joeycam

I have heard conflicting arguments on this and am researching.
When you say "The problem isn't getting the electronics" does that mean you know of a source?