| So whenever I bleed my fuel lines should I close the raw water seacock? Its all a matter of how much you are cranking and how much water your exhaust system/waterlift muffler can hold. I've never worried about it and never had a problem, but rarely needed to bleed a system unless I've had the engine apart.... I expect it to start immediately or start looking for issues. By my way of thinking you shouldnt get much air in your system changing fuel filters and I always bleed if needed while the engine is running. Too much cranking with the seacock shut could wipe out your impellor... especially if the engine starts up! I suppose that is the lessor of the evils though... A better setup would be to have a drain spigot on your waterlift muffler to open while cranking....
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