The 89 S4 Fuel PR and Fuel Damper will work for a 88???

thanks

 

Say more.

 

Reference PET Rv 7.0

Both the '88 and '89 MYs share the same part numbers for the 2 fuel dampners and the fuel regulator.

The fuel pressure is revised from the WSM data in Service Information Technik booklet WKD 495 521 stating fuel pressure is measured engine off and the fuel pump relay bridged at a level of 3.8 +/- 0.2 bar. With the relay then unbridged the pressure should hold for 30 mins and not drop a maximum of 0.5 bar.

These data points may already be known to the OP given the aforementioned documents were read and absorbed.

 

If not already done, you will need to fit a pressure gauge to the passenger side fuel rail.

Bridge fuel pump relay and pump fuel system to pressure indicated by Malcolm in post #3.

I have made a bridging system with long wires which incorporates and on/off switch, so I can control the fuel pump from the engine bay whilst pressurising the system.

Tails 1990 928 S4 Auto

 

I'm restoring this car been seating for sometime and i see the PR on the end connection a little rust so i don't trust it maybe they don't work or maybe they do and is only because like i said been seating to long without turn the engine on..i refresh the intake w/new gasket new fuel injector/starter/alternator/fuel pump /2 distributors/ignition coils and spark plug wire set..

 

Reference this forum and search.............FIRE!!!

Given the car is in an unknown state of repair and maintenance you would be well advised to source and fit all new fuel lines, then check fuel pressure and the regulator and dampners for functionality and leaks.

Again, given that you researched the topic indepth and read the appropriate documents these facts as stated are perhaps redundant.

 

Is no document to read or research any topic, the base question it is :If is advisable to replace this components i will know if the car turn on or not when i finish reinstaling what i think it should be replace In regard of the PR and Damper I would like to know what other people here opinion are..should i replace it or way to see if they work?? that is the question.

 

If you have the money, replace.

 

If money is limited, I would replace the fuel lines before the regulator and dampeners.

As soon as you apply fuel pressure to the system, pull the small vacuum line from each of the units and check for any traces of fuel in the lines. (Rub the vacuum line on your fingertip, then smell your finger.) Any trace of fuel requires replacement of that unit.

You can check the function of the regulator easily if you install a fuel pressure gauge on the system. A pressurized fuel leak all too often announces its presence with a major fire that destroys the car - and probably the area where the car is parked.

 

Well thanks Lancer & WallyP for the adviced well describe, i will replace it them money is not a problem here..so thanks again.