L_perm

How likely are these things to fail? Should I really be thinking about replacing them just because I have the intake off? Can they just be cleaned--by me or someone else who knows what they are doing?

It seems to me these things are just about maintaining: 1) the correct fuel pressure, and 2) a constant fuel pressure. My intuition tells me these are likely simple parts with only dirt/gunk to fear. What am I missing?

Thanks,
Louis

SeanR

I used to say leave them until they failed. Not anymore as more and more have been failing. I have been recommending that you change them all when you are doing the intake. They lasted 25-30 years, do it an you shouldn't have to worry about them again.

Ed Scherer

Wouldn't you start worrying about them again in about 2039, then?

ROG100

As Sean says most change them out. You can pull a vacuum on see if it holds. They can be changed later with the intake manifold in place.

TRA

Does anyone sell a package with all 3?

ROG100

We stock and sell them all - all years.
For the 86 all three - 1 x FPR & 2 x Dampers are $391.45
One of the dampers is becoming hard to find OEM 928 110 202 00

antlee928

Hi Louis, given the age of your car and if these items (based on any servce records you may have) have not been replaced at or all or at least in the last 10-15 years then my recommendation is to replace all. Probably while you are at it consider replacing the fuel pump (again if no records of relacement) Some experienced 928 service engineers have recommended replcing these fule pumps every 10 years. They have a tendency to simply fail (stop) with no prior symptoms other than the pump maybe becoming noisy over time. Just recently replaced regulator (probably working ok but looked like it had never been replaced), both dampers (pretty certain the front damper was starting to fail-could smell fule when I dabbed the vacuum port with my finger), replaced the fuel pump and also fuel filter (filter had not been done in about 8 years. Have to say the car is idling better and slightly higher (but within spec). Next will be the fuel injector reeplacement. This is simply part of an ongoing refresh program to keep my 928 running well.

Cheers

L_perm

Sounds like these should be on the replace list.

I, too, got some gasoline on my finger when I rubbed against the left rear damper vacuum elbow reaching for the CPS. I didn't think that should be normal.

Is the external fuel pump hard to rebuild vs. replacing with one someone else rebuilt?

GregBBRD

That's the failure mode. The vacuum chamber fills with fuel.

There's a rubber diaphragm inside, which doesn't seem to be very happy with the "new" fuels that have different additives and alcohol.

Rebuild external pump? Buy a new one.

karl ruiter

When they leak fuel into the air port your idle goes to crap. I have had good luck with Walbro fuel pumps. Inexpensive, drop in, made in the US, etc.

L_perm

The regulator and dampers are on the replace list now. I've got a set of your fuel lines ready to go in too Greg.

Looks like the fuel pump makes sense to replace too.


Thanks for the tip Karl.

Louis