Fuel pump not running

Tiny
GOLDFISHHH
  • MEMBER
  • 2005 VOLVO XC90
  • 4 CYL
  • 58 MILES
Fuel pump not running, no pressure. Just replaced pump, okay. Checked all of the fuses in the whole car (under hood, in rear electronic module, central electronic module), checked the relays under the hood (they all can be triggered with a 12 volt power supply). If I take out the fuel pump relay and put key in second position, I get 10 volts on the two switched leads. I did the old 'paperclip' between the two leads to simulate the circuit being triggered (no fuel pump on). Not sure what to do next.
Sunday, April 10th, 2011 AT 8:24 PM

28 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Are you getting battery voltage at the fuel pump when the relay terminal are jumped?

If voltage is available, check the ground circuit connections.
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Sunday, April 10th, 2011 AT 9:13 PM
Tiny
JIS001
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Also check the fuel pump module behind the right rear wheel well. Check connectors for oxidation especially if you live in the east coast. If that is corroded you will need to replace the module with the harness and actually the repair has you put it inside the vehicle now. Let us know what you find.
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Sunday, April 10th, 2011 AT 10:43 PM
Tiny
GOLDFISHHH
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  • 13 POSTS
Behind the right wheel well, what pieces do I need to remove to check it? What does it look like? I do live in Chicago so corrosion might be an issue. And when you talk about the right side, is this driver side or other? (Sort of like stage left or right, heh)
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Sunday, April 10th, 2011 AT 10:50 PM
Tiny
JIS001
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Remove the rear passenger wheel. Towards the front of the wheel gently pull back on the wheel well. You may need to drill out a rivet or two, but you may get lucky where you will not need too? But once you pull back the module will be sitting right there. Let me know if this helps you out.
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Sunday, April 10th, 2011 AT 11:10 PM
Tiny
GOLDFISHHH
  • MEMBER
  • 13 POSTS
Awesome, right is passenger. :)

Okay, getting drill to pop a few rivets, jack, stands, impact gun and maybe a beer or three.

First, kids get a shower.
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Sunday, April 10th, 2011 AT 11:12 PM
Tiny
JIS001
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Here is also an image of the location.
Image (Click to make bigger)
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Sunday, April 10th, 2011 AT 11:13 PM
Tiny
JIS001
  • MECHANIC
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Wish I was there to help you with the beers, LOL.
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Sunday, April 10th, 2011 AT 11:14 PM
Tiny
GOLDFISHHH
  • MEMBER
  • 13 POSTS
Yea! A picture!
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Sunday, April 10th, 2011 AT 11:14 PM
Tiny
GOLDFISHHH
  • MEMBER
  • 13 POSTS
If you are in the northern burbs of Chicago, come on over. Heh.
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Sunday, April 10th, 2011 AT 11:15 PM
Tiny
JIS001
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LOL. Sorry I am in Los Angeles. :(
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Sunday, April 10th, 2011 AT 11:15 PM
Tiny
GOLDFISHHH
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Road trip?
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Sunday, April 10th, 2011 AT 11:16 PM
Tiny
JIS001
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LOL thanks. Let me know what you find with the module.
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Sunday, April 10th, 2011 AT 11:17 PM
Tiny
GOLDFISHHH
  • MEMBER
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Well, can you give me your professional opinion? The completely non technical wife gave hers and I do not know if I agree. She says that the unit might be bad. I think it is just fine.
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Monday, April 11th, 2011 AT 12:11 AM
Tiny
JIS001
  • MECHANIC
  • 3,412 POSTS
What the heck? You opened it up? Well I see some corrosion in there on the lower part of the circuit board. Looks kind of burnt too? So looks like you need a new one now. See image below for part numbers. You will need to install it inside the vehicle to avoid this problem again unless you still want to mount it outside? If you need the directions I would need to fax it to you tomorrow since it is pretty long set of instructions?
Image (Click to make bigger)
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Monday, April 11th, 2011 AT 12:35 AM
Tiny
GOLDFISHHH
  • MEMBER
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Are you sure it looks bad? The stinky burnt smell, corrosion, busted pins and crap inside I thought was just for insulation. Guess not. (Of course I kid.)

307922, I am thinking I will just remount it on the outside. This car is on its way out and I will let the new owner deal with it. Sucks to be them. The plug looks, okay. I sprayed it with pb blaster to try and get some of the yuck out of it. My goal at this point is to get it running again.

I will call the dealer in the morning. Got an idea of price? Cannot be very much, heck, there is not anything inside it.
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Monday, April 11th, 2011 AT 12:45 AM
Tiny
JIS001
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Modules are pretty expensive? This one you may be lucky it will be just plug and play. But I guess you will find out tomorrow when you call the dealer how much it costs? So for now just enjoy that beer and worry about it tomorrow now. ;)
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Monday, April 11th, 2011 AT 12:55 AM
Tiny
GOLDFISHHH
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"That" heck, as dirty as I got yanking that thing from the car, I will have to.

The geeky electronics guy inside me knows that if I undersold the four leads, put new ones on, glue the sucker back together it just might work. Heh.
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Monday, April 11th, 2011 AT 1:07 AM
Tiny
JIS001
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You could try but the circuit board already looks burnt?
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Monday, April 11th, 2011 AT 1:11 AM
Tiny
GOLDFISHHH
  • MEMBER
  • 13 POSTS
$330.00 plus tax.

Ouch.

Going to try a few dismantlers and a home repair.
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Monday, April 11th, 2011 AT 4:28 PM
Tiny
JIS001
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Well the price is not as bad as I expected? Thought it would be double that? Good luck finding one at the dismantler then?
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Tuesday, April 12th, 2011 AT 1:15 AM

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