Hi All,
My 1975 XJ12C with 5.3 liter V12 needs a new fuel pump. The OEM replacement is made by Bosch. I plan on swapping the 5.3 l V12 with a 6.0 l V12 which has roughly one third more hp and torque. Will a standard replacement fuel pump for my 75 have enough fuel capacity to feed the 6.0 with a third more power? I would be happy with the power of the stock 6.0 in my car and do not plan on going crazy with mods. Will a stock OEM fuel pump work or should I consider an upgrade?
TYIA
Chris Hasircoglu

 

The 6.0 XJ12 and XJR used twin fuel pumps rated at 90 litres/hr each, so a total of 180 litres per hour. The second fuel pump cut in above 3200 rpm.