Fuel Pressure 1961 MK2 MOD 3.4L

Hello friends,

Would someone be able to tell me what the ideal fuel pressure ought to be for a standard set up 3.4L 1961 MK2, please? The carburettors are in good order and have the mixtures accurately set. I have fitted a new SU electronic fuel pump which was recommended for the car by the SU distributor in Australia.

Cheers,

Tim

No more than 4 psi …

The V12 carburetter cars, series3 E and series1 XJ, have recirculating fuel systems
incorporating a simple spring and ball pressure regulator set at 2 / 21/2 lbs psi.
Should be enough for a 3-4.
Peter B.

Thank you for that information, Robin, most helpful.
Cheers,
Tim

Don’t forget to put a filter BEFORE the pump. A see through disposable one will show you what can land in your fuel tank.

Gerard

Hi Gerard,

I have one of those now. When I bought the car I discovered one after the pump which was more or less fully blocked! After I replaced it the pump’s diaphragm collapsed and filled the boot with fuel. Now the carburettors are receiving fuel at a better pressure, they crying out for some attention. And just to top it all off, the 12v charging system is playing up. It could be the generator or voltage regulator. There’s always something!:wink:
Tim

What is your battery voltage with the engine off. Voltage at the battery when running and voltage directly off of the generator terminals when running.

Gerard