Mercedes installed small fuel warmers on these engines using engine coolant to warm up the fuel just before it enters the injection pump. The idea is great - especially in cold climates, but in moderate and warmer climates it is probably not needed. When they age they are prone to leaking fuel but they have also been know to leak coolant or worse yet, leak coolant into the fuel.
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If you find yours is leaking you have the option of replacing the part with new or removing and bypassing it all together. In this video instruction Kent will explain the theory and then show you how to remove the fuel warmer and bypass it with the kit we sell here on our website. REMEMBER: If you purchase the kit from us this video is included free of charge. Total Run Time: 4:52
Here is a picture of a badly leaking fuel warmer right after being removed from a 1984 190D 2.2.
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