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no worse than water in a gas tank. Drain tank , clean, blow out fuel lines with compressed air, replace fuel fliter, etc , probably will crank up ok after a little help. I cranked up a car that had been in a lake for 8 months, runs fine now, took a little work. So to answer your question bleach probably has not done much harm at all, remember when water or bleach hits the spark plugs, no combustion just shuts off. Even if you tried to re-crank it the compression ratio of water or bleach in a cylinder will not let the car turn over most likely anyway.
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