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Dear Felix,
Good p.m. and may this find you well. You should keep on-board the following spare relays: fuel pump relay, fuel injection (radio interference suppression relay), and overdrive. They can be had for short money at salvage yards. Install them, when the car is running properly. If, after the salvage yard part is installed, the car continues to run properly, write on each relay, "OK, xx June 2005". That way, you know you have a "known good" part.
How many miles on this car? How long since the fuel filter was changed? Was it making a zzzz....zzzzz....zzzzz.....zzzzz noise before the incompetent/dishonest tech worked on it? If not, when did you first notice this noise?
Do you hear the in-tank pump "spin-up" for 1-2 seconds, when you turn the ignition key from "off" to "on"? If not, then the in-tank pump likely is gone.
Have you had the fuel pressure checked, after the fuel filter, and at the fuel rail? I believe the pressure should be about 43 psi (pounds/square inch) or 300 kPa (kilo Pascals). This is the same, for turbo and non-turbo cars.
If the in-tank pump has failed, the main pump has to work harder. That will lead to premature wear.
As the in-tank pump is pretty small, I doubt it can pull enough amperage to damage the relay. The relay likely just "wore out" (it is presumably original; there should be date mark on it).
Hope this helps.
Yours faithfully,
spook
p.s. If you've not replaced the RPM/Crank sensor (atop the tranny bell housing, just behind the engine, on the passenger side [USA/Canada models]) do so. If it is original, it does not owe you a nickel. If this sensor fails completely, the cars stops. Dead. This sensor's signal tells the fuel pump to run. When the sensor fails, the fuel pump stops. These sensors often fail in an "intermittent" mode. spook
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