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Join Date: Aug 2018
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1987 BMW 325i stroked rebuild no fuel

Rebuild M20 is all installed and engine turns over but fuel pump fails to come on. Relay tests good, fuse good but no power from relay, have continuity to pin #3 at ECU plug to relay but feel something is telling ECU not to ground 3# and send power to other side of the relay to make the fuse hot and power the pump. We jumped the relay and the pump is working. Checked resistance on CPS and got 519 and 519 at ECU plug #46,47 although everything I read says 48,49 but my plug has no pin at 48! Nor does my running 325i which is the same year. Ordered new relay just because and fuse is hard to make good contact like the board underneath needs pushing up(is this possible?). Can one take the fuse box apart and work on the interior? What am I missing on the fuel side, feel like its something simple Im missing. Thanks

Old 02-22-2021, 04:30 AM
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