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Fuel pump works only with jumper wire inside glove box fuse…

Customer Question
Fuel pump works only with...
Fuel pump works only with jumper wire inside glove box fuse panel between 22 & 31. I bought the car like this. Can't find any bad fuses have checked in trunk battery compartment and under passenger cabin air filter compartment. Please advise, much appreciated!
Submitted: 2 years ago.Category: BMW
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Answered in 12 minutes by:
3/3/2016
BMW Mechanic: SuperDave, ASE Certified Technician replied 2 years ago
SuperDave
SuperDave, ASE Certified Technician
Category: BMW
Satisfied Customers: 1,491
Experience: over 16 years experience
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Is there power at fuse #22? I am assuming not.Fuse #22 is for the fuel pump relay.

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BMW Mechanic: SuperDave, ASE Certified Technician replied 2 years ago

Sounds like a bad fuel pump relay.By jumping power from fuse#31 to 22 you are bypassing the fuel pump relay.

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BMW Mechanic: SuperDave, ASE Certified Technician replied 2 years ago

Fuse #22 should have power all the times even with the key off.If not then could be a bad connection behind the fuse box.

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BMW Mechanic: SuperDave, ASE Certified Technician replied 2 years ago

A bad engine control module relay could also cause no power at fuse#22.

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Customer reply replied 2 years ago
I agree that is what I was thinking a bad relay and am unsure which it would be as there are many relay locations throughout the car with several relays.Key off: fuse 22 1.0v fuse 31 0v.
Key on: fuse 22 3.5v fuse 31 12v.
BMW Mechanic: SuperDave, ASE Certified Technician replied 2 years ago

There is a small fuse box with 5 fuses in it for the engine electronic.Did you check the fuse there?This is what the fuse box looks like.

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Customer reply replied 2 years ago
checked all 5, those are good.
Customer reply replied 2 years ago
Can you tell me the location of the fuel pump relay & ECM relay? Possibly the instructions to test the relay as well? Very much appreciated!
Customer reply replied 2 years ago
Note when the jumper is removed from #22 the dash informational display goes out until jumper is returned.
Customer reply replied 2 years ago
SuperDave, please pass on the question to another technician if you are no longer able to help, very much appreciated!
BMW Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago
sprinkles08
sprinkles08, ASE Certified Technician
Category: BMW
Satisfied Customers: 23,983
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
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Hello and welcome to JustAnswer!

The first thing that will need to be done is test for constant power to the fuel pump relay with the key on. The relay will be in one of two spots. It will either be in a relay box in the right side of the trunk, or it will be in a box just behind and below the glovebox opening.

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Customer reply replied 2 years ago
SOLUTION: This car is super clean inside and out, not a mark on the carpet, and the problem was super corroded fuse panel below passenger seat carpet. Picture attached.NOTE: Top mounted wires (majority of them) are actually OK, it's the several which attach on the underside out of view which are the culprit!
BMW Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

Excellent, I'm glad you found it! That looks pretty bad.

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