Just wondering, which workshop did you send to?

Actually you can try Renautech too, they are French specialist and charges are ok (cheaper than SC). Most importantly, they know what they're doing. Maybe you can try checking your car there prior to visiting the SC and get quotations for fixes.

Not that I own a French car but most workshops avoided fixing my Savvy last time.

because is a direct injected turbocharged twin scrolled super high class technology mah.
so put high pressure fuel pump there to pressurize the fuel rail for high class direct injected fuel to the cylinder head for more better combustion effects.

please don't compared to low class 3 bar port injected turbo. those are old technology dinosaur era engine

If it's just the fuel pump then why not decouple the internal fuel pump, bypass it and use an aftermarket pump?

Rather than trying to put 4g63 into the body

My 308T had miss firing, change the spark plug coil ok oledi.
The computer can see one which coil lifespan %.
No need to change all ignition coil and if you are on a budget, even the VTI coil fits.
Difference between Vti and Turbo version coil is Turbo one is half metal (probably for heat protection).  Vti one is all black.
I stay close to Singapore so parts got many, new and also halfcut stuff.

I sold my 308T oledi, cannot tahan maintenance.

Low pressure in the tank keep lar.
Replace the high pressure pump in the engine. Carry over both pressure sensor to the new system.

Or clamp the sensor output to nominal value. Kenot meh?