Went in for an oil change and to voice a concern about my gas tank. Upon the completion of my oil change noticed my tire had low pressure. Told drive it a few minutes, computer may need to reset. Tire pressure went even lower. Took it right back to Jeep. They check tire and could not find anything so refilled tire with air. Upon leaving noticed that my check engine light is on. Jeep now hooks up my car to get a code. They now say there may be a problem with my gas pump which is causing my check engine light to engage.