02 v70xc new fuel pump wont shut down even after battery disconnect! Topic is solved

jking4020 · Post by **jking4020** » 21 Jun 2021, 21:27

Yes I put a new Bosch fuel pump in my V70 XC wagon all wheel drive 2.4 l turbo and the fuel pump runs and drains my battery when I turn the car off. I unhooked the negative terminal on the battery and the damn thing still keeps running. I've done a few trial and errors disconnecting the fuel pump fuse on the side of the dash board driver side. And that seems to do the trick. What the hell is with new fuel pumps not wanting to turn off? Has anyone had this issue?

Post by **abscate** » 22 Jun 2021, 10:25

I unhooked the negative terminal on the battery and the damn thing still keeps running.

Break out the popcorn for this one

Post by **volvolugnut** » 22 Jun 2021, 11:22

Perpetual motion discovered at last!

volvolugnut

jking4020 · Post by **jking4020** » 22 Jun 2021, 17:39

I mean the fuel pump keeps pumping fuel when I disconnected the battery. No codes. No bad fuses or relays. New fuel pump and it does not want to turn off. Has Bosch been known to be defective?

jking4020 · Post by **jking4020** » 22 Jun 2021, 17:42

Break out the popcorn for this one

Sorry did i say something stupid?

jking4020 · Post by **jking4020** » 22 Jun 2021, 17:47

volvolugnut wrote: ↑22 Jun 2021, 11:22 Perpetual motion discovered at last!

volvolugnut

Any serious replies would be great.

jking4020 · Post by **jking4020** » 22 Jun 2021, 17:57

One thing to add. The fuel pump would not stop until I disconnected the sending unit. I'm at least 90% sure I plugged everything in correctly when I was installing the pump. Any ideas from anyone?

Post by **volvolugnut** » 22 Jun 2021, 18:47

OK, Seriously. The fuel pump is running after you disconnect the battery power? Disconnected battery negative only or negative and positive at battery? Or disconnected power at fuel pump? Are you certain if fuel pump wire connections are correct?

Sorry to be a wise guy.

volvolugnut

jking4020 · Post by **jking4020** » 22 Jun 2021, 19:04

volvolugnut wrote: ↑22 Jun 2021, 18:47 OK, Seriously. The fuel pump is running after you disconnect the battery power? Disconnected battery negative only or negative and positive at battery? Or disconnected power at fuel pump? Are you certain if fuel pump wire connections are correct?

Sorry to be a wise guy.

volvolugnut

Yes! I turned the car off and the fuel pump was still running. I had the seats up still and I could see the pump and still hear it running. I disconnected the negative terminal on the battery thinking it would solve the issue but the thing still ran. So I took the passenger seat up and disconnected the sender unit and that's when it stopped finally. F#$+ing gremlins! I can't afford a new car this is seriously weird!

jking4020 · Post by **jking4020** » 22 Jun 2021, 19:06

Then I took out the sender unit and switched the two plugins that are identical to see if that may have been a problem. I have no fuel pump sound of operation now and no start issue. No pressure at the fuel rail. No fuses or relays are bad.