944S vs 944S2 pressure regulator

[S944calalta]

Hello 944 community. This is a specialized question relating to 944S and 944S2. Anyone know if the 944S pressure regulator (at the rear of the Fuel rail) is the same for 944S and 944S2? It appears they will bolt to the fuel rail with 2 bolts that are definitely interchangeable. Both 944S and 944S2 are 16 valve cars however the S is a 2.5 liter and the S2 is a 3 liter engine. The question is really if the 944S regulator has the same "bar" as the 944S2 regulator. You all might wonder why I am asking. The 944S regulator uses a hose and clamp on the return line and the 944S2 uses a pressure fitted nut on the hose. The S2 hose is less likely to leak I would think. Any 16 valve members who would like to comment I would appreciate it! Thanks.

[wwdwgs]

download PET catalogs from Porsche site and compare the part numbers.
If you know the part number, search for it on Pelicaparts site and check the compatibility below the items description.

[944 Ecology]

The pressure dampers are the same for the 944S and the 944S2.

The pressure regulators are different.

[S944calalta]

Thank you both for your input. The 944 S regulator has a part number of 944 110 198.04 and the 944 S2 regulator has a part number of 944 110 198.06. The regulators have a different part number and are specific to either S or S2.

[Monkey Wrench]

from what Ive seen the dampeners are crazy priced but it's possible to use one from another car that has the same pressure range, or some of the aftermarket ones are adjustable.

You might want a bright shiny Porsche one if it's a $how car, mine doesn't need a thousand dollar one and it is likely rare that they actually fail anyway.

if the regulator gets a break in its diaphragm you can get fuel in the vacuum line. if the dampener got stuck it may make the fuel line noisy but it has no exit for fuel to leak. you could replace it just for reliability reasons. If the FPR fails it can seriously upset how well it runs. I don't think a sudden breakdown is likely to be caused by a problem with the dampener.

Im less familiar with the 16 valves but its similar, different fuel pressure , some changes to the tank, hose routing etc. mine is 86 and it is fed from the bottom of the tank, the hose leaked and it lost all its fuel. likely that's why newer models pumped the gas from inside the tank. I bet mine wasn't the only one to leak its full tank of fuel. obviously that was a danger caused by poor engineering. the rubber hose rots out.

on mine the PO noticed it drippong and stuck a bin under it to catch the gas until it ran out, but that could really cause a serious accident.

newer cars may shut off the pump if they sense a crash. Automakers likely improved safety that way. ,, and then they needed an in tank fuel pump to get the gas out of the topside of the tank.