SpaceX will try first private cargo run ... again

The Falcon 9 SpaceX rocket stands on space launch complex 40 ready for another launch attempt at the Cape Canaveral Air Force Station in Cape Canaveral, Fla., Monday, May 21, 2012. After an aborted attempt with a half-second remaining before liftoff last Saturday, SpaceX is set to launch early on Tuesday, May 22.
AP Photo/John Raoux

(AP) CAPE CANAVERAL, Fla. - Private rocket maker SpaceX is shooting for a Tuesday liftoff after fixing the engine problem that led to a launch abort over the weekend.

The U.S. company is the first private business to attempt to launch a spacecraft with supplies to the International Space Station.

The new launch time for the historic flight is 3:44 a.m. (0744 GMT). Forecasters say there's an 80 percent chance the weather in Cape Canaveral will cooperate.

All nine engines on the Falcon 9 rocket ignited during the first launch attempt Saturday. But with just a half-second remaining before liftoff, on-board computers shut everything down.

The problem was traced to a faulty engine valve. Engineers put in a new valve and declared the rocket ready to fly.