so you want to work on your ferrari but are scared to death....

also check your throttle cable on your 550 the heat will break the shielding and cause you problems
there is a tremendous amount of heat underneath the hoods of these cars that cause issues

 

oh yea that was your fuel problem
and don't use the K&N air filters
the oil that is used the vapors attack the intake manifold air flow meter sensors wire and cause lots problems

 

too each there own
I was just putting it out there since I have seen it numerous times on vehicles of all types that have air flow meters
and since I am new to this forum I was totally unaware of previous post
so that's my excuse
hope that satisfies you !
but there is significant data on the air mass wire being coated with oil from K&N air filters
and I will leave at that

 

you’re smart
You can use the K&N filter just don’t oil it
Unless your driving in the desert with sand
You will be fine
Air filtration is highly overstated
Check your throttle cable while your at it
And apply heat shielding to your brake mater cylinder area
And around your battery box as well

 

Wow yes that was your problem
Glad I could help

 

ok so you might have stale fuel or water in the fuel
try a full tank of fuel and run a tank through the car
if you have injector cleaner try some of that as well
over here in the states I use https://www.marvelmysteryoil.com/ or chevron Techron
remember your fuel injectors have been suffering with poor fuel filtration
it will clear itself up
I doubt it is the Cat
when they get clogged they overheat
try the easy stuff first
let me know

clyde

 

ok so we now know its a fuel delivery issue just as i suspected
if you have 3.2 bar of pressure which is around 46 psi
it is not the fuel pumps because you would not have that much pressure
i think you have a clogged up fuel filter again
i would replace the left side fuel filter again and see if the flow improves

clyde

 

if there is a way to do that
I don't know it
a quick change of the suspect fuel filter should tell you if that fuel filter is clogged with stuff from the fuel tank
you have equal pressure in both sides so its not the fuel pumps
so thats my best guess at this point
let me know what you do
you might have to clean out the fuel tank if thats possible

 

question?
what do you have tied down in the back of your 550 with the straps?

 

that was too funny
you guys
are too much

 

ok so its like I thought the rubber around the pumps have come apart and are in the fuel tank causing you the recurring problem
this is a common problem
with the 550 especially with the ethanol fuel
it eats away the rubber
especially if you don't fill the tank to the maximum
after you drive it which is a must
you will need 2 new pumps and I hate to say this 2 new fuel filters as well once you complete the job
I wish i could tell you how to clean out the tank but I have never done that
I will ask around though and get back with you
but i am glad you found the issue
take you time and you will have a normal operating car one again
looking forward to hearing all this all comes out
I only hope you have not damaged any fuel injectors
I would buy some fuel injector cleaner as well as a precaution

 

ok so i saw the video and he tells you how to clean out the tank
great
you should have no issues going forward
i just new it was a fuel delivery problem from the outset