Actually, the way it went down was, they pulled in to fill up, Joker went in to the station to stock up on junk food for the trip to Manhattan, Speed Bump, meanwhile, set about programming his GPS. At that point, the Chinese guy made a break for it, running to the gas station across the street and hiding in the storeroom, having asked the clerk to call 911.
Then Speed Bump, realizing the futility of recapturing the Chinese guy and the imminence of the BOLO, ran into the station and recovered Joker before he could complete his purchases, saying We've got to Go! Now!
Not long afterward, the Watertown PD recognized the now BOLO'ed vehicle and pursued. Speed Bump was killed in the resulting fire fight (not sure exactly when, but his final experiences included getting run over by his escaping brother, hence his moniker), and Joker was captured 20 hours later hiding in a guy's stored boat.
A HERO CHINEESE GUY, IS