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Hello. Either your B.M.W. doesn't have a return fuel line or, if it does, that line is blocked/restricted. The latter isn't likely because the engine might 'flood' with gas, making it hard to start/run. Keep me informed; if you want to.
The service and repair manual with diagram will provide you step by step help to locate and fix the problem on your own easily and you will get the manual from the given link https://toolsnyou.com
ECU (Engine Control Unit) relay, fuel pump relay and oxygen sensor heater relay are located in the under-hood E-Box. The E-box is under the large black plastic cover at the passenger side rear of the engine compartment.
I usually just buy steel fuel line of the correct size and use the old line as a guide to bend up the new one. Cut off excess and make new double flare. Much cheaper than trying to buy stock part.
Bad pump. Bosch pump no less. about $120 on line for just the pump. You can also buy the entire assembly which includes the sending unit that reports back to the fuel gauge. auto parts and bmw sell that thing for three times the price. The same pump is used in many many of different series BMW's. After 60,000 miles they are changed out as part of routine preventative maintenance, because a bad pump will leave that hot babe driving it stranded at the mercy of the local bugger pullers.
Check your manual, the car came with. The diagram in the manual shows where everything goes. Honda is notorius for no-restarts. Save money by buying a Main relay or fuel injector relay first. Sounds like you need a new one. Second hand one sells for around 57 bucks. Maybe less.
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