I don't know how your evaporative carbon trap hoses are connected, but if the
anti-run on valve has been removed from the circuit (mounts next to the
windshield washer tank) you may get what is usually called "dieseling," or
run-on.
The anti run-on valve shuts the hose from the carbon traps when the engine is
turned off, preventing the carb from running on the fumes from the trap.
I also noticed a valve being sold in somebody's catalog (Moss or V-B) for
backfiring. There wasn't any text saying how it worked.
Sean Johnson
'79 MGB
'75 Spitfire
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