2004 XC70 no start - faulty fuel pump and/or electrical connections? Topic is solved

Post by **abscate** » 16 Aug 2023, 02:13

I’m going to push you away from the “ junk in tank diagnosis”. You don’t get crap in fuel anymore unless someone hates you and puts it in your tank directly, likewise for plugged fuel filters.

enotslim · Post by **enotslim** » 16 Aug 2023, 14:31

abscate wrote: 16 Aug 2023, 02:13 I’m going to push you away from the “ junk in tank diagnosis”. You don’t get crap in fuel anymore unless someone hates you and puts it in your tank directly, likewise for plugged fuel filters.

"Old junk" hanging around in a 19-year-old car and finally causing problems? Does the inlet really have an impeller that can fail? Is it powered? I have everything needed to disassemble/reassemble the entire fuel pump unit (but not replacement parts). Replacement won't answer the question without a diagnosis.

I could drive it two floors down into the parking lot at work hoping it will fail.

Danalberto231 · Post by **Danalberto231** » 17 Aug 2023, 06:53

I also think I read that the PEM was introduced to the XC70 sometime during the 2004 model year. Maybe my 2004 XC70 is pre-PEM? Would a VIN lookup provide that info? How about a scan tool?
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enotslim · Post by **enotslim** » 19 Aug 2023, 08:00

I don't remember finding any information via the VIN or using a scan tool about presence or absence of the PEM in my 2004 XC70. I never found one by looking in all the known locations as described earlier in this thread. Vida/DiCE seems like it might provide info about the presence/absence of a PEM. I have Vida but not DiCE so I can't try this. Does someone know for certain? As in have you detected lack (especially) and/or presence of a PEM this way?

Post by **cn90** » 19 Aug 2023, 08:19

Please list locations you have looked for PEM...

Post by **jonesg** » 19 Aug 2023, 10:51

enotslim wrote: 19 Aug 2023, 08:00 I don't remember finding any information via the VIN or using a scan tool about presence or absence of the PEM in my 2004 XC70. I never found one by looking in all the known locations as described earlier in this thread. Vida/DiCE seems like it might provide info about the presence/absence of a PEM. I have Vida but not DiCE so I can't try this. Does someone know for certain? As in have you detected lack (especially) and/or presence of a PEM this way?

2003 and up it should have a pem. jack up and use jackstand,
passenger side of tank, looking up it sits on top of tank peeping out.

goldxc70 · Post by **goldxc70** » 04 Sep 2023, 09:16

Danalberto231 wrote: 17 Aug 2023, 06:53 I also think I read that the PEM was introduced to the XC70 sometime during the 2004 model year. Maybe my 2004 XC70 is pre-PEM? Would a VIN lookup provide that info? How about a scan tool?
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I believe this is correct. Some 2004 models do not have PEM while some later models do. I double checked this with my indy Volvo shop (long time Volvo tech).

goldxc70 · Post by **goldxc70** » 04 Sep 2023, 09:20

enotslim wrote: 15 Aug 2023, 20:51 ...Can the fuel pickup/impeller/(not a siphon) be serviced? Blocked by "stones" that presumably precipitate from contaminants in the tank?

In my case, thhe pump itself appeared to be fine but the fuel pickup/impeller appeared to have failed. I can't say of this was caused by wear or contamination in the fuel but it was definitely not free to spin as the new one was.

Post by **jonesg** » 04 Sep 2023, 11:11

goldxc70 wrote: 04 Sep 2023, 09:20
enotslim wrote: 15 Aug 2023, 20:51 ...Can the fuel pickup/impeller/(not a siphon) be serviced? Blocked by "stones" that presumably precipitate from contaminants in the tank?
In my case, thhe pump itself appeared to be fine but the fuel pickup/impeller appeared to have failed. I can't say of this was caused by wear or contamination in the fuel but it was definitely not free to spin as the new one was.

i ran my old volvo on fumes too often and burned the pump up.

Post by **erikv11** » 17 Sep 2023, 09:46

enotslim wrote: 19 Aug 2023, 08:00 I don't remember finding any information via the VIN or using a scan tool about presence or absence of the PEM in my 2004 XC70. I never found one by looking in all the known locations as described earlier in this thread. Vida/DiCE seems like it might provide info about the presence/absence of a PEM. I have Vida but not DiCE so I can't try this. Does someone know for certain? As in have you detected lack (especially) and/or presence of a PEM this way?

My 07 XC70 I was troubleshooting the PEM and I didn’t the PEM anywhere in VIDA.