In an earlier trial five patients in the U.K. had undergone a surgery in which a tiny catheter implanted in their brains continuously delivered GDNF from a pump inserted in the stomach (the pump is refilled with a needle through the skin).

FORBES: Magazine Article

Static electricity could cause a small spark when a petrol pump nozzle is inserted which could in turn ignite fuel vapour in a flash fire.

BBC: BMW recalls new Mini