SU fuel pump pressure

I am fairly certain it has a rear mounted pump so its an HP one which is 2 to 3.8 psi See Single Type - SU Carburetters
I have just looked at the workshop manual and depending on the year it could be a front ( engine bay) mounted pump in which case its a LP one with a pressure of 1.5 psi
 
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Normal pressure for carburettors is 3-5 ib/sq.in but if he went to a specialist he could probably get the correct replacement.
 
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