Hey guys. I bought a 2k a4 on these forums as a fixxer upper. I'm finally getting it fixed now but I'm having one main issue. There is no power in the fuse box for my fuel pump. The guy at the body shop was able to get it running and keep it running by running a power wire from the battery to the fuel pump fuse. What is the problem? I have a complete 97 a4 as a parts car (bad motor) so I can get the parts but I'm not sure where to start.

If it makes a difference, the 2k was damaged in the front. The guy at the shop thought it might have a fuel shut off switch activated by a font end collision, but I don't know about that.

 

I'm thinking it's the ignition switch they are known to go bad the bad part is you have to take apart the steering column to replace it

 

Agreed - that and the fuel pump relay are the only components between the battery and the pump. The relay is possible but of the two I'd think the switch is more likely. Turn the key on and see if any other ignition-switched components (lights, radio, wipers, etc) work. That can help you confirm or reject it.

 

Tried what you guys suggested. I am getting the radio but no wipers. The headlights are out of the car so I couldn't confirm that either way.

What else can I try? If it were the pump relay where would it be located?

 

You have to drop down the knee bolster (driver side) to get to the relay, I cant remember the position for the FP relay tho.

I do not personally have much experience with the ignition switch on our cars, but I do on bikes and stuff. And on them, it will allow the accessories to kick on but will not prime the fuel pump, if say the diode is bad or something. Not the same Jeremy?

 

When mine failed, I lost the majority of my ignition-switched features. If I remember right, the FP relay is number 372 under the driver side of the dash. I had a thread when my pump failed. It was called something like "weird sh*t when troubleshooting my car". That info and more is in that thread.

 

Well I guess the fuel pump relay is good and we swapped in a known working ignition switch with no luck. Now what?

 

The relay won't close unless the ECU detects the engine cranking. If you turn the engine over and the relay doesn't close, then you might need to replace the (crank? can't remember) sensor.