Boost pump use with Continental injected engines is usually different.
Try switching the electric pump on with the EDP and you will often experience a rich cut. Varies with the exact engine / pump / installation & power setting etc. Also if there are high & low press. settings eg IO-520 variants used in C206/207/210/310/400 series and Baron/Bonanzas.
Seneca's with the Continental IO-360 are similar but the single flow rate pump is there as a replacement for the EDP in case of failure and also for purging. The Catch is that it can only supply sufficient fuel flow for about 75% of max power. Don't think I'd be too impressed if I had an engine failure + the live engine EDP fail!