The VP44 pumps were a problem. Some failed because of failed soldier connections on the computer board. Others because the fuel pressure was lost because of a failed fuel pump. The pump itself gets all the blame usually. Some rebuilders will go through and replace what looks bad. If the board still meets specs they leave it alone. Trouble is they had a life span of so many heat cycles. After that they died so if you got one that they didn't replace it in, you could have it fail anytime after you put it on. Fuel to the pump heats up as you are driving. This contributed to the failures also. I have a temp gauge on mine and I have seen it as high as 170 degrees. There are actually only a couple of factory authorized Bosch rebuilders in the US. I sent mine to the one in Chicago. They had a new upgraded computer board for it and basically made a new pump out of it. I had them send me the replaced parts back so I know what went into it. I run a fuel pressure gauge on it and watch it close. Before I choose who to send it to I talked to a lot of places offering rebuilt ones. When I asked one guy about replacing the computer board, he said they test it and if it works the don't bother. They wanted the same price as the factory rebuilt one I got with the new board. Paid to ask questions.
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