Well you won't destroy it by taking off the metal cover. Use a small screwdriver or blade to lever up the crimped edges and slide the cover off. Didn't find any evidence of bad joints on mine, but did find corrosion inside the unit when I opened up my Fuel Pump Relay. I let my mechanic indulge himself by resoldering the contacts but went to my parts shop and bought new units anyway. Seemed to help a little but ended up as just another milestone on the great KE Jetronic exploration adventure.

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1987 300e manual 250,000 km (sold)