Thanks to this forum, I relocated the PMD and heat sink to the bumper hole years ago and, after Grancito told me how to install a manual switch for the fuel pump, I have been driving worry-free for a long time. But yesterday, the truck repeatedly started up right away then cut off after 5-10 seconds. I tightened the four PMD screws and drove home without a problem.

Now I am wondering, about how long before PMDs need replacing and how do I know when they are starting to go bad?

Thanks for any advice.