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I suggest that you might have a cracked fuel-feed pipe that could allow the fuel to drain back.
WRT the alternators, the second alternator might be to cope with the use as a mobile home (with batteries for lighting and other uses). Is there a sign of such a system?
Some coaches probably had an extra alternator to cope with on-board electrics such as a sound system for the tour guide or maybe a video player.
You might find that one alternator is 12 volt (and the other 24 volt).
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