I would be reluctant to make such a modification. The relay and an actual failed pump are two separate issues. As much as there have been failures with the relay, it seems that considering the entire fleet, there have been few failures by comparison. I was closely involved with the Caspers Cruisers issue, which precipitated this thread. My opinion is that on his issue it was not a pump failure, but the relay. Yes, there was a mounting bracket failure, but I do not attribute that to a pump failure. We will never know whether it was the pump or the relay because both were changed, but I would put my money on the relay.
In my opinion, the important thing is to reduce vibration of the ECU. This will be accomplished by checking the isolators regularly and replace as needed. On mine, besides replacing the isolators, I repaired the relay receptor and zip tied the relay tightly to the receptor. A bad connection could cause failure of the relay as well. Why the other relays have not been affected is beyond me. Maybe the location of the fuel pump relay happens to be the exact harmonic point? In any event I would not start fiddling with a system that works by relying on other components to function properly just to avoid a rare occurrence. If I were to do anything regarding design I would have mounted the ECU remotely, not on a vibrating diesel engine.
