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ram pressure

At least one issue would be vapor lock.  When the electrical pump fails (or
electric system failure) you have no pump.  May not be a problem during
cruise, but during takeoff or while in the pattern on a hot day you're
expecting basically atmospheric pressure fuel to flow to your hot carburetor
without flashing to vapor; hum-m-m-m.

Or even without vapor lock; can you get enough flow to the carb for full
power operation without pressure?  Don't count on it!

Al Gietzen  RGE