I think the mechanical fuel pump (carbs) delivers about 3-5psi, so something around that ball park should be OK.

Rimmers say: We also stock a Facet electric fuel pump, designed to fit in the engine bay. Suitable as a replacement for any carb vehicle, including Edelbrock or Holley-equipped, it delivers 4-5psi pressure. It is therefore not suitable for EFi.

"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10