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I've been plagued by run on for years, including after my rebuild. Ran across an article in Norm Nock's book re adapting an MGB/TR6 anti-run on valve (ARV) to Healeys.
It works!
On engine shutdown, an always-hot relay activates the timer, which powers the valve for 10 seconds; the valve opens and allows engine vacuum to connect to the carb overflow tubes, resulting in immediate shutoff of fuel to the combustion chambers. During normal running the path for the overflow tubes is open to the atmosphere and the engine vacuum is sealed off. Servo operation - while engine running - not affected.
Had to get rid of my PCV valve, though, as the ARV requires all the engine vacuum in order to work.
Nock used an MGB oil pressure warning light switch to operate the ARV, but I replaced that with an inexpensive delay timer.
Details at: https://www.pbase.com/stevegerow/healey_tech
It works!
On engine shutdown, an always-hot relay activates the timer, which powers the valve for 10 seconds; the valve opens and allows engine vacuum to connect to the carb overflow tubes, resulting in immediate shutoff of fuel to the combustion chambers. During normal running the path for the overflow tubes is open to the atmosphere and the engine vacuum is sealed off. Servo operation - while engine running - not affected.
Had to get rid of my PCV valve, though, as the ARV requires all the engine vacuum in order to work.
Nock used an MGB oil pressure warning light switch to operate the ARV, but I replaced that with an inexpensive delay timer.
Details at: https://www.pbase.com/stevegerow/healey_tech