Fuel Pressure Regulator NOT the problem.

[Soldion]

Would a 03 s60 2.5t awd fall under this? I do not have a FPS on the fuel rail, and can not find the PEM unless ingot to drop my plastic fuel tank?

[Oly850]

Hey Luthieran,

My son and I are swapping a fuel pump out on his 95 850, but the replacement comes with three wires. A red / black in a connector that fits fine plus a thin black wire. Is this a second ground?

Thank you in advance!

TF

[hiroku]

I know this is an old thread but it’s still being accessed, so I offer some additional info that has taken me 3 weeks to work out; 

there are several different fuel control systems on P2 V70s, XC70s and XC90s dependant on year/month.

the system often discussed has a PEM (or FCU) which controls fuel pump output via a PWM signal from the CEM, this system has a pressure sensor on the end of the rail and a (mechanical) regulator somewhere between the send and return lines, can be in the engine bay by the RHS drivers wheel or actually in the head of the fuel pump! The PEM can be located near the fuel filter, or in the spare Wheel well in the boot or on top of the fuel tank!

However, you may not have a PEM at all. A few models are ‘controlled’ (just switched on really) directly from the CEM (via the fuel pump relay). These pressurise the fuel line, but have no pressure sensor (or even fuel damper in my case), and rely on a mechanical pressure regulator built in to the fuel pump head on the return line in the form of a pressure relief valve. 

How can you tell? Apparently from the VIN - but this didn’t help me. The clues are; no pressure sensor on the rail, possibly no fuel pressure damper fitted, no PEM anywhere! The definitive test is to take the pump out and look up into the head, if there is a metal insert with a hole in the middle and a star clip holding it in place, then that’s the regulator on your system.
  
You will need a replacement pump with one of these built in if the regulator has failed. If you get one without this, it might fire up and idle but will likely falter under load.

To compound the problem, several different wiring configurations exist,
1) with all the connections on the RHS
2) with all the connections on the LHS (where the second fuel sender is located)
3) with a combination of some on each

In searching for your PEM (which you may not have), follow the wires away from the pump, if you have none heading towards the fuel filter area, spare wheel well, or top of the fuel tank, then you probably don’t have a PEM (like me!)

I highly recommend getting the correct tool for removing the pump and/or second sender - at only £20 they will save you breaking the plastic locking rings. 

This post should be stickied!

[SteveOV70]

This has been super informative!, Iv been dealing with this issue for a couple weeks now myself. The mechanic who used to service my car told me the issue was a pressure regulator, I have a 04 V70 front wheel drive (metal tank). I replaced the fuel pump thinking the regulator was on top of the pump, but when completing the job I forgot to plug in the wire that goes to the PEM, so after all that was stalling out. Car would start, rev up the slowly just start to drop then stall. I undid the battery plugged the wire back in left the battery unplugged 2 days n went back out put the battery back on and now it’s running again. The engine code hasn’t come back on yet. The code I was getting b4 was p0259B which said (injection pump metering control B” there is a tiny bit of hesitation when pressing on the pedal coming from a stop to go. So now I’m trying to figure out if my car is good now or will I be driving down the highway n my car will just die again lol. My next guess is the PEM? Anyone have thoughts?

[jonesg]

if it has a PEM you should be able top read fuel pressure with a scanner or vida.

[surfbug1]

Yeah I'm having the same problem.

P0089 and P0087

Bought a FPR and then ....ooops! Nothing on the fuel rail.

So I guess I gotta pull the in tank fuel pump.

And see what type it is.

But first I may disconnect the battery and see if anything everything "resets"

Thoughts? 2006. 2.5T. S80

[SteveOV70]

Hey so with my Volvo V70, mine is the FWD and the code that was given to me was a 02059, somthing abou t whatever regulates the fuel. So I was told all that was apart of the fuel pump itself, I went and got a new fuel pump replaced it and it was super easy. But then a week later car would crank then just very slowly rev down sputter and bam dead. I took it to a garage cause by this point I needed a car to drive to work. They told me it was either the pump or the PEM. After pondering it I thought about it, because my model doesn’t have a regulator. So I thought.. well what tells my pump to work? To send whatever fuel it need to go?, well it would be the fuel PEM which controls all that! Batta bing! Problem solved! I haven’t had a single issue w the fuel since then. So I don’t know what codes those are you are getting but know that just cause a code tells u one thing doesn’t always mean it’s that. But I’m sure if those codes are fuel pump related I’m sure it’s your pump. If you need and help w what to do for replacing the pump holler at me I’m glad to help

[SteveOV70]

But I did that exact thing to surf I got the FPS which made it mess up so I knew that wasn’t the problem

[SteveOV70]

Hey thanks for the great info!!!, so it turned out that my V70 has the steel gas tank!, which I know a lot of peeps know that there was a weird year or 2 that the switched some stuff up why I have no clue but for my version 2004 2.4L FwD it has the steel gas tank and the fuel pump itself is accessible only on the passenger side back seats and doesn’t have the the sender which Iv seen In other videos on Utube, so the sending unit is build on top of the pump itself. The lock ring is a metal ring (not like the tool Iv seen online or in videos) I had to use a big screw driver and just tap it and it came off easily enough. But after replacing the pump itself a week later I was having the same issue from before. I brought it to a mechanic and they couldn’t figure out of it was the pump itself or the PEM. So I took a gamble and replaced the PEM and it fixed my issue!!!, for my version of the car it was located in from of the passenger side rear wheel well on top of the gas tank! )

[SteveOV70]