Need Fuel Pressure Regulator Part # 96 850

waynej · Post by **waynej** » 04 Oct 2011, 08:08

My 96 850 non-turbo has the non-return fuel system ( no return line to the tank). I need to order a new fuel pressure regulator and both FCP Groton and Eeuro are showing only the return system part The # on the old part looks like 3775721, but it's hard to tell for sure as it's it not directly visible and had to read it with a mirror. Eeuro says that # does not cross to anything. Can anyone tell me how the non-return system works? I don't see how this thing on the fuel rail that looks similar to a FPR could possibly control the pressure. Is there a regulator someplace else in the system?
I would be very grateful if someone could come up with the right part # to order so i could get the car running.

Post by **erikv11** » 04 Oct 2011, 09:22

I do think this little unit does all of the pressure regulation but will leave that question to others. For part numbers:

non-return FPR (damper) is Bosch W0133-1660728
and the return style FPR is Bosch W0133-1608439

My car is also the non-return style, I bought the non-return FPR from www.autohausaz.com.

I was chasing fuel economy issues and replacing the FPR had zero effect so my old one was fine. I would sell it for $20 shipped, send me a PM if you want it.

Post by **MyVolvoPartsOnline** » 04 Oct 2011, 10:07

For cars with the non-return system up to -96 it is part number 1275773.

caz2773 · Post by **caz2773** » 04 Oct 2011, 11:35

you have a fuel pressure damper and you have the fpr located by the fuel filter under the rear right tire never heard of the damper at the rail dying but check the fpr by the fuel filter it should be close to the roll over valve

waynej · Post by **waynej** » 04 Oct 2011, 11:55

Caz2773, thanks much, it's making sense now.
Erikev, It looks like the reason it didn't do any good to change the part was that you changed the damper not the FPR. I almost did the same thing.
Does anyone know what the correct fuel pressure should be? Does it vary with engine load? With the return system the FPR is connected to manifold vacuum, so when there is less vacuum-fuel pressure goes up.

Post by **misha** » 04 Oct 2011, 16:00

MyVolvoPartsOnline wrote:For cars with the non-return system up to -96 it is part number 1275773.

My fuel pressure damper is #1275658(Volvo number,original/stock one).
Pierburg numbers are #7224 38 01 for original(stock one) which is not available anymore & it's replacement #7 224 38 51.

According to Pierburg,BOTH of those parts are not longer available from them.I know that for sure because i recieved e-mail from them a week ago.

I tried to order that fuel pressure damper directly from them and to save double more money than it costs at dealership.But,they answered that this part is discontinued and it's not available anymore.

I asked them to make a cross reference for me and to tell me what part numbers would be for Bosch replacement (instead of Pierburg which is not longer available)and they told me that they are not able to do that,because they don't have replacement numbers for that part.

Can you believe that?....I got that answer from Official Pierburg Site in Deutchland.

Anyone know what are the numbers for a Bosch replacement?

Post by **erikv11** » 04 Oct 2011, 16:35

I posted the Bosch numbers up above.

The AutohausAZ site has pictures of both Bosch models to make it crystal clear.

The reason replacing the dampener didn't help in my case was, the part was not bad. No parts were bad, car ran fine before the replacement, there was no fuel pressure issue, just trying to chase better fuel economy and had a suggestion to swap it out so I gave it a go. If the diaphragm inside the dampener (called an FPR by most people) goes bad, then the unit will not hold pressure properly, and/or can leak fuel and cause the car to run rich.

Post by **misha** » 04 Oct 2011, 17:04

erikv11 wrote:...If the diaphragm inside the dampener (called an FPR by most people) goes bad, then the unit will not hold pressure properly, and/or can leak fuel and cause the car to run rich.

That's the problem i have.My car runs very rich when i put a cap at vacuum tree nipple,which should be capped and it was capped from the day i bought the car.When i remove the cap,car runs rich,but not that rich(not visible black smoke from the exhaust).

So..it runs preety normal(not that rich) with a vaccum leak.I have that problem for years.Every sensor in the car was replaced at that time(both o2 sensor,Maf sensor with oem Bosch)and car was acting the same.

I did a little research in a past few years and found out that only problem could be fuel pressure damper.I also took the car to a dealer a few times because of that problem and they just replaced parts without knowing for sure what was bad.Maybe it's this...or it could be that....with a lot of my money and patience.This is the reason why i NEVER will go back to them and why i HATE dealerships(stealerships).

The car was only three years old at that time with a very low mileage (70k km),serviced by them,and they couldn't figure out what was wrong with it.

Thanks to you guys and thanks to my patience and my will to learn about it...the car is still running in it's perfect condition,serviced and maintained by myself.

waynej · Post by **waynej** » 04 Oct 2011, 19:44

MyVolvoPartsOnline.com, I entered the number you gave me on your site and it's the absorber on the fuel rail. I need the fuel pressure regulator which apparently is near the fuel filter.

Misha, AutohausAZ has the damper for $48.14 but no one seems to have the fuel pressure regulator.

Since everyone is coming up with #'s for the damper(absorber in Volvo language) and no one has a # for the
fuel pressure regulator I am wondering; has anyone ever heard of the regulator failing?

DOES ANYONE KNOW WHAT THE FUEL PRESSURE SHOULD BE FOR A 96 850 NON TURBO?
Mine is just under 41psi. when it's 90 degrees out and 44psi. when the temp is 60. I thought I read someplace a few years back that it should be 48psi. The car is short on power in cool weather and extremely short on power in warm weather.

Post by **jblackburn** » 04 Oct 2011, 19:48

The fuel pressure regulator failed on my 1998. It choked my car from take off and it was blowing black smoke out the exhaust.

I don't know about a 1996, but on the 1998 (the same in most respects, though little things were changed between the 1997 and 1998 models underneath) it's behind the power steering rack inside the right front wheel.

I had a heck of a time finding one, but I eventually just ended up going to a junkyard and stealing one off another non-turbo S70.

Fuel pressure should be 43 psi, ignition on, engine not started, and about 38 at idle, increasing with throttle pressure, vacuum pressure, and engine load.