2002 Sprinter 2500 with 190,000. In the past twelve months we have had the following issues. It began with the high pressure fuel pump needing to be rebuilt (thank you Dk.A!), then the alternator died and needed replacement. Van ran rough with black smoke. Replaced the fuel filter and air filter. Still ran rough with black smoke and had no power. Thought it was an EGR valve so we replaced it, still ran horribly with black smoke on acceleration. Finally took him to the Dodge Dealership (only place around who will work on Sprinters). They replaced the fuel injectors and a hose. Black smoke is gone, engine runs fine until you hit 2800 RPMs. The check engine light kicks on the and he won't accelerate above 2800. Turn off the engine and it resets itself. Drives fine until you 2800 RPMs again. Other than this minor (!!!) issue, van runs great. Then came the whistle, slowly it appeared. Now, whenever you accelerate, there is very high pitched whistle. We thought it was a leak in a hose. You only hear the whistle when the van is under load. Finally returned him to the dealership. The tech. must remove all the fuel injectors. Called back today, was told the mechanic was needing to drop the fuel tank. I assume to check the fuel pump? OF course, you cannot actually speak with the mechanic to determine whether they actually have an idea what the problem may be or whether they are just checking everything in hopes of uncovering something. Any way, any thoughts?