I was experiencing the same problem. A couple of days later (warmer days) my wife began to smell fumes. Then, suddenly the vehicle became difficult to start. Once it started it ran pretty well but the mileage dropped drastically....leaking fuel line coming off the filter. Few bucks later it fires perfectly and the possibility of watching all go up in smoke is vanquished.

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'89 300E 3.0
'82 350SD