Same deal with relay as for pump. Tends to operate or not. May operate for a few tries, than not operate for a few tries, but I have not seen a partial situation here either.

Could be the filter or the fuel accumulator, or an induction problem, or an electrical problem.

If you do replace the fuel pump (only 1 pump for you), get a Bosch. Do not be tempted to get the 'made in Taiwan' pump that many parts stores stock. Will be loud, and will not last long. Been there.

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1986 300E 5-Speed 240k mi.