Hi ,
Where can I find the code for the fuel pressure regulator?
I have a Volvo from 2005 1.8 SE and I got starting problems ,
The car is starting after 5-10 seconds of cranking , not always , except this the car drives mint . I want to change this fuel pressure regulator first because I strongly think that this is the problem.

Thank you!

 

have you already scanned for OBD2 codes? The 1.8 never came to the US so I can only assume its FI is similar to the 2.4i - which in 2005 or so changed from using a fuel pressure regulator to using a fuel pressure regulator and variable pump. On the Gen1 cars with the 1.9 which used the fuel pressure regulator - the typical fail was a torn diaphram which let the pressure bleed out of the rail so there was no residual pressure for the cold start. This would not throw a code as once the car cranked for a bit, the pressure would return to normal. The quick test for the FPR is to pull the vacuum hose off the sensor and see if any fuel drips out of the port. The other test is to meaure your fuel pressure at the rail using the shraeder valve to see what the pressure is for a cold start and steady state pressure once the car is running. If your car only has the pressure sensor design, then you can test for pressure at the rail directly. To note - there's a huge price difference between the Gen 1's fuel pressure regulator ($230 US ) and the pressure sensor ($35 US)...

 

I can't find the fuel pressure regulator or vacuum hose. Can you please help me?
I attached pictures with the engine. Thank you!!

 

don't think you have a fuel pressure regulator only a fuel pressure sensor. On the Gen 1s the pressure regulator bolts onto the driver's side of the fuel rail and has the fuel line going into it. Looks like your model uses a fuel pressure sensor.

 

Thank you for your time and effort!

The engine code is
b4184s11
It looks like is 1.8 16v . How could I check if it got a fuel pressure sensor?
Thank you!

 

I offer some additional info that has taken me 3 weeks to work out;

there are several different fuel control systems on 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 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.

 

Hi, my Volvo S40, 2007, 1.8 SE have the exact same problem, sometimes is taking 5-10 seconds of cranking before starting, once started is driving like new. How did you resolve your problem? Thank you Xx