Yeah, he taxied to a gas station to fill it up.
( Yeah ( , ( he ( ( ( taxied ( to ( a ( gas station ) ) ) ) ( to ( ( fill it ) up ) ) ) . ) ) ) )
(ROOT (S (INTJ (UH Yeah)) (, ,) (NP (PRP he)) (VP (VBD taxied) (PP (TO to) (NP (DT a) (NN gas) (NN station))) (S (VP (TO to) (VP (VB fill) (NP (PRP it)) (PRT (RP up)))))) (. .)))
He filled up his airplane at a gas station. 
( He ( ( ( ( filled up ) ( his airplane ) ) ( at ( a ( gas station ) ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD filled) (PRT (RP up)) (NP (PRP$ his) (NN airplane)) (PP (IN at) (NP (DT a) (NN gas) (NN station)))) (. .)))