How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask sprinkles08 Your Own Question
sprinkles08, ASE Certified Technician
Category: BMW
Satisfied Customers: 22690
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
Type Your BMW Question Here...
sprinkles08 is online now
A new question is answered every 9 seconds

Fuel pump works only with jumper wire inside glove box fuse

Customer Question

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: 1 year ago.
Category: BMW
Expert:  SuperDave replied 1 year ago.

Is there power at fuse #22? I am assuming not.Fuse #22 is for the fuel pump relay.

Expert:  SuperDave replied 1 year ago.

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

Expert:  SuperDave replied 1 year 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.

Expert:  SuperDave replied 1 year ago.

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

Customer: replied 1 year 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.
Expert:  SuperDave replied 1 year 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.

Customer: replied 1 year ago.
checked all 5, those are good.
Customer: replied 1 year 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: replied 1 year ago.
Note when the jumper is removed from #22 the dash informational display goes out until jumper is returned.
Customer: replied 1 year ago.
SuperDave, please pass on the question to another technician if you are no longer able to help, very much appreciated!
Expert:  sprinkles08 replied 1 year ago.

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.

Customer: replied 1 year 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!
Expert:  sprinkles08 replied 1 year ago.

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