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Sorry to disagree, but the mech pump WILL pull through an elec pump. I have a Holley pump mounted by the tank that only runs when switched on.
As I stated earlier, not true on some pumps...Carters in particular.
I have a Carter pump, no problem.
You must have a vane-type pump, Carter gear rotor pumps are different:
"IMPORTANT NOTE:
When using a gear rotor type pump....
These pumps cannot be used as a secondary unit ie, on a dash switch. They MUST be wired to run continuously from the IGN circuit as your PRIMARY and ONLY PUMP.
This pump type uses a DRIVEN gear and a RING gear to create a positive displacement and force fuel through to the carb. The gearing is similar to your oil pump. They do NOT have any check valves like a mechanical fuel pump, thus if they aren't running, you cannot DRAW fuel through them via a mechanical pump, etc ( at least, enough to have the engine remain running)."
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