Left handside as you look at it from the front of the car is the fuel rail pressure control valve.

 

then what is the fuel regulator

 

regulator = control valve

 

HI HAVE YOU EVER LOOKED INSIDE ONE ? ITS JUSj a cilender with nothing in it how can it regulate the fuel ?

 

It regulates the pressure by opening and closing a return port in the rail, excess fuel then returns to the fuel tank via the fuel return, you can test this valve using a multimeter the internal resistance of the valve solenoid winding should be about 3.6 Ohms.

 

Hi Andy thanks for your reply. so am I right that the rail pressure solenoid and the injector leak back pipe and the pipe from the high pressure pump all go into a cylinder. Then go back to the main fuel tank ? If so what is that cylinder called.and why do lots of people call a regulator ?

 

The high pressure fuel rail has the regulator in one end and pressure sensor in the other, it looks like this....
http://www.ebay.co.uk/itm/VAUXHALL-...OR-05-09-/111236591647?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item19e637b01f

 

sorry andyl cant see this early ! yep its a bit different then mine but see it. so again what is the small cylinder called ?

 

If yours is the same then the long silver cylinder is the High pressure fuel rail, the valve with the plug at 90 degrees is your pressure regulator and at the other end with the plug poking straight out is the fuel rail pressure sensor, there is nothing else on the rail other than these parts, if you buy a NEW replacement rail it will all come as one part i think.

 

hi did you get the 2 web addresses i've sent

 

Hi Mate, sorry had to go to work.
I can see where the confusion is, the cylinder you are talking about is not the fuel pressure regulator, it is the Fuel Return Damper, i suppose it does regulate fuel pressure to a degree but it has no real bearing on the fuel rail pressure, here is a diagram of the Z19dth fuel system, the damper is number 2.
The fuel pressure regulating valve is number 4.

 

hi mate managed to finally find the problem, as i have put in the first post after a lot of cost and hard work it turned out to be the rail pressure solenoid !! having bought 1 off ebay secondhand and it was a lot better, it still went into limp mode but only after 2200 rpm. so bought another 1 again from ebay and this time hey presto ! it worked.so i'm going to all the stuff i have replaced on ebay soon if you know anybody needs vectra c z19 150bhp cdti 54 plate stuff. thanks for all the help much appreciated !

 

Well done mate, glad you got it sorted.

 

Hi Andy, i know this post is old but im having the same problems with my vectra, do you know what valve he replaced? Thanks

 

Hi,
He changed the fuel rail pressure sensor like this one, before ordering make sure its the correct sensor for your car.....http://www.ebay.co.uk/itm/FUEL-PRES...s_SM&fits=Car+Make:Vauxhall|Model:Vectra|Cars+Type:1.9+CDTI&hash=item53f31fb916

 

Hi,
He changed the fuel rail pressure sensor like this one, before ordering make sure its the correct sensor for your car.....http://www.ebay.co.uk/itm/FUEL-PRESSURE-SENSOR-FOR-OPEL-VAUXHALL-VOLVO-1-9CDTI-2-0CDTI-2-4D-0281002706-/360561228054?pt=UK_CarsParts_Vehicles_CarParts_SM&fits=Car Make:Vauxhall|Model:Vectra|Cars Type:1.9 CDTI&hash=item53f31fb916

I got a rail complete with sensors from the breakers yard near me, it now works perfect! Thanks

 

Well done mate.