Have bandaid but want fix - 39 flathead

[adileo]

Hi

First the facts: 1) Mech fuel pump is less than 8 mos old - bought from drakes. 2) I had this problem before putting mech new pump in 8 mos ago 3) have electric fuel pump 4) I only use high Oct gas 5) dual edelbrok 94s 6) I replaced most of the rubber fuel lines (not all)

I have an intermentant problem. Most times car run great idle & all speeds. I like to run the car without the electric fuel pump running and only use it as cure for vapor lock or after car sits for long time.

Every so often (doesnt matter - can be sitting at idle- driving 40-50 or slowing down for light) the car loses fuel pressure and begins to stall. I hit the switch & turn on electric fuel pump and (within seconds) car acts perfectly fine. As soon as it does I shut elec pump off and most times I good to go without problem re-occuring for that drive.

The vacum line from the dist to manifold is mostly a rubber hose - can that be the culprit? Or a simple dirty fuel filter?

thanks in advance Andy