NASA called off Thursday's launch of space shuttle Atlantis after a pair of fuel gauges in its big external tank failed to work properly, a recurring problem ever since the Columbia disaster.
Shuttle managers said they would try again Friday, provided the trouble can be resolved quickly.
Preliminary indications are that the problem might be with an open circuit rather than the gauges themselves - perhaps a spliced line or bad connector - which would be easier to fix.
"We're keeping all our options open," said launch director Doug Lyons.
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