An A320's fuel crossfeed system malfunction prevented the right wing fuel tanks from feeding an engine and possibly pumping the left wing tank fuel to fill the right wing tanks (inner and outer). The flight diverted to a nearby airport.

Narrative

Shortly after departure we got an ECAM for center tank pump one low pressure. Because this had occurred on the last three flights; it wasn't totally unexpected. The Captain (non flying pilot) accomplished the ECAM procedure and everything worked as advertised. Approximately two hours into the flight the First Officer (flying pilot) noticed the fuel page was displayed on the lower ECAM screen. The right inner and outer wing tanks were full of fuel and flashing green. The right wing did not appear to be feeding. The left wing tanks appeared to be feeding normally except that the fuel on that side was significantly lower than expected. The center tank was empty. The Captain referred to the Flight Manual (FM) but didn't find a procedure to cover this situation. During this time the First Officer did some basic fuel calculations. The calculations considered trapped fuel in the right wing; inaccurate gauge indications and fuel being transferred from the left wing tanks to the right wing tanks. According to these calculations; there would potentially not be enough fuel to continue to the destination. Both pilots discussed the situation and concluded that both engines were being fed from the left wing tanks. Both were unclear as to whether the fuel in the right wing tanks was trapped or whether the full indications were inaccurate. In either case; the amount of fuel onboard was uncertain. The Captain decided to call Dispatch and Maintenance to get their thoughts and to help remedy the situation. He described our situation and indications to Maintenance who suggested resetting circuit breakers which had no effect on the problem. Both the Captain and the First Officer became increasingly uncomfortable with the developing situation and agreed that it would not be prudent to continue the trip. The Captain; with the concurrence of the First Officer made the decision to divert. Dispatch suggested diverting to a nearby airport. A normal descent and landing was accomplished and the flight continued to the destination on an alternate airplane.