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You have to isolate the problem you are facing, if there is no fuel supply you can also have a blocked fuel filter. If you are sure of the problem, you can by-pass the relay and if the pump works then you need to replace the relay. To by-pass the relay you need a short length of 2.5mm cable to connect two (2) terminals. I shall get a diagram to indicate which terminals (in a couple of days. Regards Ehi

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Q: How do you know if you need to replace your fuel pump or your relay box on a 1987 190e 2.6?
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