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I'd check the battery voltage. It should be over 12.7V before cranking and 10V during cranking.
If it isn't you can try charging, then focus on the cranking voltage. If that drops way off the battery is junk.
You shouldn't need to jump with a car if it holds the proper voltage during the tests.
Not sure about the petcock flow numbers, but if it flows strong I would think it's fine.
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