fuel pressure regulator?

ajr2820 · Post by **ajr2820** » 16 Oct 2011, 08:56

Well I hope you are right. This has been a very confusing topic that needs cleared up. I am just going to change the FPD and see what happens since there is no return line on my car. Although I normally do not replace parts without fully understanding what's going on, this one may be worth the finger-crossing.

Billc1015 · Post by **Billc1015** » 17 Oct 2011, 06:33

I was able to check in Snap On's Shopkey program. The do show that being a fuel pressure regulator back with the fuel filter. The picture is showing how to disconnect the hoses from the filter and the regulator. Pretty much looks like what you have.

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I am here: http://maps.google.com/maps?ll=40.334357,-75.130977

Post by **misha** » 17 Oct 2011, 16:20

Interesting data,but....the "thing" i have is located after the fuel filter towards the engine,not before fuel filter.

waynej · Post by **waynej** » 17 Oct 2011, 17:26

Misha, The picture you took is the FPR and it is the same part # that earlier models used on the fuel rail and some later models mounted it right behind the steering rack. There is 2 screws holding it to a plastic base that imitates the fuel rail. There has to be a FPR in every system. The dampener (Volvo calls it an absorber) on the fuel rail has nothing to do with pressure regulation. There is no reason to replace the dampener unless it is leaking into the vacuum line.

Post by **misha** » 18 Oct 2011, 19:39

waynej wrote:Misha, The picture you took is the FPR and it is the same part # that earlier models used on the fuel rail and some later models mounted it right behind the steering rack. There is 2 screws holding it to a plastic base that imitates the fuel rail. There has to be a FPR in every system.

I also thought that it's the same part,but i didn't had anybody to confirm that.To me....it looks just like regular fpr which older 850's have at fuel rail instead of fuel pressure damper,but it's smaller.Even the holder for it looks the same.I think that it's direct fit.

On my luck,i allready have the old style fuel rail with functional fpr still attached to it.I got it from a friend a few years ago but i thought that it's unusable since i have fpd at fuel rail.

You don't know how happy i'm right now when i know that i can install that fpr near the fuel filter.

How sure you are about this?Can you send me a picture of what you have near the fuel filter?I would like to compare it with what i have in there.

How can i test vacuum controled fuel pressure regulator?It's sitting on the shelf in my garage along with fuel rail for a few years.

Misha.

Post by **misha** » 18 Oct 2011, 19:57

waynej wrote:...There is no reason to replace the dampener unless it is leaking into the vacuum line.

Wayney....How it can leak into the vacuum line when it DON'T have a vacuum line?

It's self regulated,and it's purpose is to remain constant fuel pressure.It's attached ONLY to a fuel rail and it DON'T have extarnal connections for a vacuum.

Here is fpd:

: Fuel pressure regulator(damper).jpg (81.38 KiB) Viewed 1700 times

trophytaker308 · Post by **trophytaker308** » 19 Oct 2011, 06:23

wish they had one like on my mustang,were you could see the pressure you are runing and also can adjust it.are they out there for volvos?

Post by **misha** » 23 Oct 2011, 10:04

waynej wrote:Misha, The picture you took is the FPR and it is the same part # that earlier models used on the fuel rail and some later models mounted it right behind the steering rack. There is 2 screws holding it to a plastic base that imitates the fuel rail. There has to be a FPR in every system. The dampener (Volvo calls it an absorber) on the fuel rail has nothing to do with pressure regulation. There is no reason to replace the dampener unless it is leaking into the vacuum line.

Can anybody else confirm this

waynej · Post by **waynej** » 23 Oct 2011, 12:06

Misha,
On Oct. 11 you posted a picture of your FPR near RR wheel.
On Oct.12 Erikv 11 told you your FPR is not a rollover valve.
On Oct. 12 you posted a diagram from Confused_al showing the setup you have with the FPR by the filter near the RR wheel.
On Oct. 17 BillC 1015 sent you a very good diagram showing exactly the same thing you took a picture of near your RR wheel.
It appears to me that it has been confirmed that your FPR is by the RR wheel and the damper is at the fuel rail.
Before you change the FPR make sure you have vacuum to it, it won't work properly without manifold vacuum.
I ordered a new FPR and then found I didn't have vacuum and had to fix two leaks, one at the rollover valve and one at the canister. Now my FPR works fine and it cost $11.00 to ship the new one back to eEuro.

Post by **erikv11** » 23 Oct 2011, 13:27

I agree with everything in the last post by waynej, thanks to his recent posts I have a good grip on this now.

There are two setups on the 93-98 850/x70: with FPR at the rail, or FPR somewhere else (near the filter or near the engine). There is always an FPR, and it always has three nipples/connections on it. One nipple for vacuum line, one for fuel return, and the large connection into the fuel supply.

When the FPR is at the rail, there is no damper.

If the FPR is *not* at the fuel rail, then there is also a damper (FPD), in the rail position. There are two styles of damper: one with a vacuum nipple, and one with no nipples,like confused_al posted.

fuel pressure regulator?

Re: fuel pressure regulator?