is it safe?

i was smelling gas inside my subaru and my mechanic found a leak at the passenger side fuel dampener. he goes to order it, but the part is on national back order for a month, so he temporarily replaced it with a small, high pressure hose.
he said my check engine light might come on, but only worry if it starts flashing OR if i start smelling the gas again. a test drive today has produced neither, but i ask you: is it safe to drive or should i rent/borrow a car for a month?