Need photo of fuel pressure regulator on fuel rail

ClayBubb · Post by **ClayBubb** » 29 Jul 2012, 12:18

So I know what I'm looking for. (Sorry--I'm used to 50s - 70s American V8s. I'm an abject rookie on the Volvo here. Thanks for your patience!!)

Post by **j_cd** » 29 Jul 2012, 12:33

Fuel Pressure Dampener

I was just wondering if I should replace this about 20 minutes ago. I'm sending my injectors out for a professional cleaning.

Post by **jimmy57** » 29 Jul 2012, 13:15

That is a fuel pressure damper. They look very similar but this is towards the middle and has no lines on it. It is simply a diaphragm chamber that stabilizes fuel pressure peaks and dips as injectors open/close.
I do not have a car here to take a photo of but your FPR is in a similar place on the fuel rail . It will have a vacuum line attached.
Found a photo:

Post by **j_cd** » 29 Jul 2012, 13:25

Yeah I was wondering if the NA engine had something different on the fuel rail. Guess so.

ClayBubb · Post by **ClayBubb** » 29 Jul 2012, 13:32

Wow! You guys are awesome. Heck, I just barely got back from walking the bulldog, and here are all these pics already!! Back in a jiff, soon as I figure out the P0172 code.

ClayBubb · Post by **ClayBubb** » 29 Jul 2012, 13:47

PS, my non-turbo 850 only has the aforementioned fuel pressure damper. If that were it, it would truly be a booger to yank off a vac tube & put it back on!!

Post by **j_cd** » 29 Jul 2012, 14:17

ClayBubb wrote:PS, my non-turbo 850 only has the aforementioned fuel pressure damper. If that were it, it would truly be a booger to yank off a vac tube & put it back on!!

I think you're saying your engine has the same part as mine. This one doesn't have a vacuum line going to it. I thought the pressure damper just unscrewed from the fuel rail, but I just tried, and it didn't.

Post by **jimmy57** » 29 Jul 2012, 15:40

I didn't think 97 n/a's had it relocated.
Look down behind engine on passenger side, it must be in the line there.
The 97 GLT's had it there and a damper usually is used on remote FPR applications due to hydraulic ugly stuff a long column of fuel causes.

Amys 940 · Post by **Amys 940** » 29 Jul 2012, 15:45

Yeah, my 98 V70XC has the regulator down near the steering rack on the passenger side. Odd location if you ask me.

Post by **jimmy57** » 29 Jul 2012, 15:58

Fuel heating is a bad guy for hydrocarbon emissions. Hot fuel evaporates too much and exceeds the capacity of a reasonable sized charcoal canister. Not recirculating fuel from rail was the first effort, second was moving FPR back by fuel tank, the final one is controlling fuel pump speed to keep the pressure controlled.