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If a replacement relay continues to get hot and fail this can be a sign that the main fuel pump is working too hard and drawing too much current. The fuse will eventually blow, but until then the relay is taking the brunt of the punishment and will continue to fail. If the replacement relay was a cheap aftermarket one then this may be sooner rather than later. The main pump will have to work hard either when it is worn out, when the in-tank pre-pump is not assisting it or when there is a restriction in the fuel line like a plugged filter (although they're often surprisingly clean). Pre-pumps die more often than main pumps. There's also a short rubber hose on the pre-pump that can disintegrate and will cause bucking and stalling when you're tank is below half full. Look in the 700/900 FAQ for tips on dealing with these issues (a 240 is basically the same).
For your oil leak, when you cleaned the PCV hoses you need to clean the small hose and throttle body orifice as well. A blocked breather box is the next most likely source of major back pressure especially if the oil filter hasn't been religiously changed. If you don't deal with the problem other seals will soon start leaking or the dipstick may pop up. You can determine if you've still got a problem by loosening the oil filler cap all the way and performing a quick and dirty suck down test (it's actually not dirty at all). If the cap rattles or can be lifted with absolutely no resistance other than gravity then your PCV system isn't working. Again check the FAQ for info on oil leaks.
For your jump-start stall, if it hasn't affected operation then I wouldn't worry about it. I can only guess that you had a voltage surge when the cable arced as you disconnected it and the surge upset the ignition or fuel system computers even though they have built-in surge protection. There is a proper order for attaching cables during jumping to minimize such problems -the black negative chassis ground (done away from the battery to avoid explosion) is done last when connecting and first when disconnecting.
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-Dave (not to be confused with a real expert, just goofing around at this)
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