One problem related to fuel injection rail has been reported for the 1999 Subaru Impreza. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 1999 Subaru Impreza based on all problems reported for the 1999 Impreza.
Fuel leak on passenger side fuel rails in weather below 30' f. Substantial amount of fuel is leaking due to the rubber hoses underneath the intake manifold not being tightened enough. There is a TSB on this matter however I'm past my warranty period. Considering this leak is right next to the turbocharger this is just an accident waiting to happen.