QUOTE(toolguy @ Jan 13 2016, 10:24 AM)
An low oil pressure switch / ignition cutoff on a carb'ed engine is almost useless. .
First off, the float bowls have enough gas to keep running 1-2 minutes after you have lost all oil pressure
2nd, when starting, no oil pressure but you need the fuel pump to run before cranking to refill the fuel bowls .
The idea is not to save the engine, it's to save you. You don't want the fuel pump to continue running when you get knocked unconscious in a bad wreck. If a fuel line gets severed or the car flips over you'll have gas flowing out of the carbs or the lines until the key gets switched off.
Like you said, there's fuel still in the float bowls. If the car hasn't been sitting for long periods it starts up just fine. Worked great on my bug. 5 psi pressure switch is located just under the 009 distributer.