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 himself up with gas at a gas station. 
( He ( ( ( ( filled himself ) up ) ( with ( gas ( at ( a ( gas station ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD filled) (NP (PRP himself)) (PRT (RP up)) (PP (IN with) (NP (NP (NN gas)) (PP (IN at) (NP (DT a) (NN gas) (NN station)))))) (. .)))