It does sound like the in-tank pump is failing but it could be an issue with the cross-over pipework from one side of the saddle tank to the other. It appears to be a reasonably common issue - I've had to replace mine due to a leak through a crack developing on the return line connection.
Short term, keep the tank filled above 1/4 to 1/8 of a tank, or park on a slope (nose down or favouring the off side seems to be the preferred orientation).
If you replace the pump, the tank needs to be below the two access points - the lowest is near side, both access points located under the rear seat. Plenty of information on the forum on replacing the pump.
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Current cars: 2003 V70 D5 SE (MY2004); 2012 CRV 2.0i V-TEC;
Gone but not forgotten: 2001 Honda HRV; 1989 VW Polo C Mk2; 2000 Honda Civic VTi Aerodeck  ; Cavalier SRi; Cavalier LX; 1971 Triumph Spitfire Mk3; 1963 Triumph Herald.
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