Question about 2001 BMW 5 Series

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The fuel pump doesnt kick on when turning the key on

The car was running fine and now it wont start I think it could be a fuse to the fuel pump does this sound right

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  • 149 Answers

If you can hear the fuel pump, it is getting voltage. But the change in it's normal sound/tone that it makes has me more concerned with the pump itself. Sometimes the pump gives you clues that it's about to fail, but not always. The sound change is an indicator something is wrong inside the fuel tank. Have you done a pressure and volume check yet? That's the only sure method to see if the pump is working properly. If you do have a failing pump, I would highly recommend replace the filter too! It's cheap and will save you a lot of headaches if they're done at the same time

Posted on Dec 12, 2014

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 1995 e34 520i won`t start

may need to change spark plugs or make sure that you have the correct plugs(spark)

Posted on Sep 10, 2008

  • 145 Answers

SOURCE: BMW 525i will not start

There are six fuse panels for an E39 BMW
Fuses F1 - F45, fuse panel 1, glove compartment. Twist white plastic retainers 90 degrees and pull down from top of glove compartment.
Fuse 31 (10 amp) protects fuel pump relay(K96)

Fuses F46 - F6, fuse panel 2, trunk located behind right side luggage compartment interior panel.
Fuse 54 (15 amp) protects fuel pump relay(K96)

Before I would do any of the following, I would check the above fuses and put a bottle of HEET into the fuel tank. Fuel filter changing is not hard, but it will take you about an hour.
The fuel pump is another story (BMW has a special spanner wrench(16 1 020) to remove and install the threaded collar.

E39 BMW use a two-lobed fuel tank(think saddle bag like). Each with its own fuel level sending unit that has a float connected to a variable resistance wiper contact. To equalize fuel level between the two tank lobes, a siphon pump is installed in the left lobe. The resistances need to be approximately the same. The fuel pump is on the right lobe under the tank sending unit beneath the threaded collar at the top of the fuel tank which is accessed by removing the rear seat cushion. WARNING When removing the fuel level sender or the fuel pump, the fuel tank should be drained to 1/4 capacity or below. The fuel in the fuel line is under pressure (45-75 psi). Always unscrew the fuel tank cap to release pressure in the tank before working on the tank or lines. Disconnect battery negative cable.

The fuel filter is located beneath the center of the car near the driver's seat usually under a protective metal cover held on by small screws. Not hard to replace but car will need to be on jack stands and 1/4 tank or less of fuel in the tank. Definitely wear safety goggles or face shield as the fuel will come out on face. Have a fuel catch pan under the filter. Clamp the fuel line before and after the fuel filter(long metal cylinder) before loosening hose clamps. Loosen center clamping bracket and hose clamps on either end of filter. [Some have an inline fuel pressure regulator.(Remove vacuum hose, pull out locking clip, remove fuel pressure regulator).]
Drain fuel from inlet side of filter and check fuel for rust moisture or other contaminats.
Installation is reverse. When installing fuel filter, ensure fuel flow direction arrow points to front. Should have at least 5 liters of fuel in tank before restarting. The fuel pump will be damaged if run without fuel.
PT Stanley

Posted on Jan 23, 2009

  • 416 Answers

SOURCE: my 04 bmw ignition doest start

If it doesnot crank at all look for starter/starter relay/starter relay fuse. Most probably wiring coming to starter is loose, try to tighten it more (push towards starter). Also I would check antiteft system (if it is provided for your car) as some BMW have immobilizers.
If it cranks no start look for spark plugs, wires, distributor cap, coolant temperature sensor, O2 sensor, fueling system (fuel pump cutoof switch, fule pump relay, fuel filter).
Please kindly let me know if you need more information, or kindly provide me with more details to assist you better
Good Luck

Posted on Feb 01, 2009

jackiaria
  • 350 Answers

SOURCE: 1994 525i BMW, it cranks but it won't start

Dear prettydwilli, Friday 02-20-2009 11:17pm EST (USA)

Could be a fuse or a relay or fuel system gunk in cold weather!
Try a can of Starter fluid sprayed in the air filter!
If it starts and stays running it could be just gunk or junk in the gas tank!
Do you ride til the tanks empty?
If so fill the tank with high test or just get the starter fluid and some expensive ($10) fuel system cleaner to add to your tank and try it again!
If this doesn't work look for a bad relay or fuse at your local auto parts store. Advance Auto Parts is my favorite....they will probably tell you where the relay is located and may let you return it if it doesn't work. They're very helpful!

jack
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Posted on Feb 21, 2009

  • 3 Answers

SOURCE: 1994 BMW 530i replaced the fuel pump the car will not start

i have the same problem right now. the relay is located under the big black box on passenger side of engine compartment. There are three relays in there. orange, blue and white. I dont know which is associated with the fuel pump though.

Posted on Mar 08, 2009

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