Fuel pump problem

I have a 1979 Airstream 240. 454 v8, gas engine motorhome.

I'm pretty sure the existing electric fuel pump is itermitent and bad.



I don't know what pump pressure rating is needed for this motorhome.



If I went to Pep Boys and asked for and asked for a 79 Chevy P-30 454 v8 compatible electric fuel pump, would they know what I need?



I don't think so, and That is why I am reaching out to the

Airstream community. Does anybody know the best brand? Pressure needed?

etc.



I know the motorhomes came with mechanical pumps, but since the unit has been retrofitted with an electric pump, I think I want to keep it electric.



If I replace it with the same electric pump, I'm left wondering if it is under pressured or over pressured?



Any help would greatly be appreciated.