Resting the engine would allow the vacuum in the fuel tank to equalize, and if there is some larger debris blocking the intake pipe, it would allow it to settle away from the intake. So it is possible that either could be a cause of the surging. If you've taken the precautions of cleaning the tank, then I doubt it is the latter.
The poor fuel hose connections might also be the cause, as the leaks will allow the fuel line pressure to drop, but it doesn't sound as if the leaks are large enough for that. It would probably be a wise precaution to change out those fuel hose segments and properly tighten the replacement fuel line there.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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