fuel contamination

Hoping for a stop-gap quick fix. My wife has a diesel workvan - 2005 Sprinter 5cyl 4.2(?) Mercedes engine. The known problems are a torn turbo recirc hose (AFTER the spool ass'y. , leads back to air manifold) and 4 of 5 glow plugs have failed. We live in a temperate climate where it rarely...