MGW-Fla

Is it possible that a FPR & Damper on an '85 could be in switched positions & still operate correctly? My '85 appears might be the case. I've always understood that the FPR is on the passenger side, as shown in the drawing attached. My "FPR" on the passenger side however, doesn't have three outgoing fuel lines, only two. It's without the front line that runs to the fuel cooler.

I've never taken either off, even when I did my fuel lines about 5 yrs ago. I attached a pic from prior to my replacing the fuel lines as I wanted to make sure I had not ever mucked with them. As the pic shows, the "Damper" on the driver's side does have the front fitting with a fuel line that runs to the fuel cooler. All other fittings match with the schematics & what I understand of how they are supposed to be.

Guess I wouldn't care since its always run great since I've owned it, but I just put in Porken's Chips & was about to install the required '87 FPR that I got from Roger when I realized that something was up. No fuel line to connect to the front fitting on the '87 FPR, unless I install it where the "Damper" is on the driver's side.

Does anyone have info on cross checking Bosch part #s?? I haven't taken either off yet, but I can see a portion of the Bosch part # on what is installed on the passenger side, and it ends in ......0 161 021. The "Damper" on the driver's side has a Bosch # of 0 280 160 215. I had a note that was an FPR #, but now I don't remember where I saw that at?

MGW-Fla

Ok I answered my own question, was able to find a Bosch cross reference which confirms by the Bosch part # that it is my FPR on the driver's side for some reason. So unless someone tells me there's a problem with leaving things as they are configured, I'm just going to proceed with switching the '87 FPR with the one on the drivers side.

FredR

If you had them the wrong way round the system would not work period, but then you would have no where to connect the fuel return to and petrol would be peeing out all over the place!

That they are "physically" the other way round from what we see in the S4 and later models is of no consequence what matters is the process configuration and that looks fine to me.

If others know better I am sure they will holler.

Regards

Fred

Landseer

There is a technical bulletin that talks about a swap of position for the damper and regulator early during the 85 model year.

Not sure why the swap was made, maybe for some concern factory had with their original configuration for fuel line routing?

Anyway, aside from whatever reason underpinned that swap, your own change to 87 regulator should work as Fred already suggested.



I'll try to find it again...

Well, I found it... bulletin 8504 of June 19 1985.
6 pages. In CD's. Change of sides and related hardware, from 1985 USA/Japan manual trans engine 81F 00276 and auto 81F 05480

let me know if you need more..

SeanR

Actually the car will work but will run like ****.

Had a customer purchase a car that had a Devek motor in it, apparently Devek shipped the engine to a shop for final assembly and they could never get the car to run worth a damn. Owner left it in his garage with a bad taste in his mouth, and it sat for several years. Then a customer of mine bought it a few years ago and was sorely disappointed in the way it ran. The guy he bought it from did not disclose the issues. So I get to looking at it and what do I find? Things reversed just like one page on the WSM. Swapped it all around the way it should have been and the car ran fantastic.

MGW-Fla

That's what's so great about the 928ers here on RL, the intricate details of info known collectively never ceases to amaze me. I'll have to check my CDs. Thanks to all for the info.

Sean, if my '85 has run just fine so far with this configuration, are you speaking of a potential problem after I switch my '85's FPR to an '87 version with the higher fuel pressure?

MGW-Fla

Well looking at that bulletin, it appears my '85 has the old layout with the FPR on the driver's side. So other than having to re-route things, I'm going to just switch the old FPR with the new one & hopefully all will be well. Then I can try out my new set of Ken's chips!

davek9

I didn't notice a vaccum feed on the FPD in the back, the one pictured incorrectly installed on the right side where the FPR should be.

Don't both FPD's one in front left and the one rear left require the vaccum feed from the 7 way splitter that also connects to the FPR on the right to work properly ? I was under the impression that is how the fuel system knows if your hitting the go peddle or backing off.

Thanks,

Dave

Edit: guessing I just can't see them in the pic

MGW-Fla

Correct, both vacuum lines on the FPR & Damper are in place, just out of view in that pic.

MGW-Fla

Got em switched & all works well, Thanks!

17prospective buyer

Reading about Bosch EFI they stressed that a regulator and damper look very similar but cannot be mixed up!

MGW-Fla

They do look very similar, the main bodies are practically identical. Just the number of fuel line connections is different, 3(Damper) vs 4(FPR), and where the lines route to. So you can't really mix them up if you are replacing either that's existing on your car. I just didn't realize the '85s once had the FPR on the driver's side, thought they were supposed to be passenger side. Thus this thread to make sure before I made any replacement.

chamilka

NP