Check out ferrarichat.com - there is some info there regarding the issues you describe. Maybe you can also find a reputable Indy. I think that one company even manufactures a heat sink for the pump. This is because the location/heat exchange is problematic. You do have much higher temps below the hood that we don't see...
Thanks -- in fact I have posted on Ferrarichat as well:
F1 behavior on a 360 - FerrariChat.com
The sample size on the F-car is much smaller and some of the people are less interested to touch the cars but have 'hearsay' info about what could and may be...I want to get my hands dirty as much as I can with this thing.
The pump itself should be identical to the Alfa unit btw - for 455. Dunno about 360 though.
The motor between your units is identical for the Ferrari 360 and the F430 cars, in fact one less known trick is to swap out the $300 USD motor (200 UKP?) from the Alfa units instead of getting the Ferrari pump ($1,500 USD). I have done this as well on this car just as a preventive measure since I didn't see anywhere in the history that it had been changed.
For what its worth although cannot accurately diagnose, seems like sensors/connections. The symptoms are very much alike when the selection sensor has a bad connection or is fooked. Wouldn't surprise me if the sensors are identical. Many parts are interchangeable. Look for pf2c on eBay and see if this is what you need. Mind you - the Peugeot/Citroen ones are reversed in polarity and this cannot be used if I remember correctly.
I'm in the process of investigating this -- of course my sensor is on the car and I can't poke and prod at it until I get it off, but I've been doing some research.
Here are some pictures -- the two black sensors with wires are what the original Magneti Marelli sensors are on the Ferrari 360. They look awfully similar to the ones you linked me to (eBay: PF2C).
Separately, the picture of the sensor with the red background and 181325 is what the current $2.5-3K USD sensor from Ferrari is.
Interestingly enough I had found the same sensor as in the red picture on eBay as a 'used' item for $500 and this is shown in the next two pictures.
As you can see in the last picture the part number is clearly shown as well as the PSA (Peugeot/Citroen) logo -- this is a $100-150 sensor.
Granted, Ferrari puts a harness around it and some cabling but I have a few guys who can build me cabling that will withstand a nuclear war :-)
Any thoughts? Which sensors are reverse polarity from your experience?