Mediates the transport of acyl-CoAs and/or free fatty acids to the endoplasmic reticulum. Has no effect on the selectivity of fatty acid incorporation into triacylglycerol or further desaturation steps. Highly expressed in siliques. Detected in seedlings, rosette leaves, stems and flowers. Expressed during the middle and late stages of seed development. Reduced seed size with abnormal morphology and reduced triacylglycerol content. Retarded growth on medium lacking sucrose. Overexpression of ABCA9 increases seed oil content. Belongs to the ABC transporter superfamily. ABCA family. CPR flippase (TC 3.A.1.211) subfamily.