Close
Q:

will a faulty fuel pump vapor lock a gas line on 1990 Mercury Grand Marquis

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
when it gets hot it dies
(1) Answer
vapor lock happens when the fuel boils and creates air in the system. with the new cars, increases fuel pressure stops that process. it sounds like you have a fuel pump failing when it gets hot. have a pro diag it for you to confirm

Roy