neilll

Can I just get a quick confirmation of which side of the engine's fuel rail is supply and which is return?

Macster

Which MY? My 2002 Boxster doesn't have a fuel return line. The fuel system is a "returnless" system.

Below is a link to a drawing of the fuel system lines in the engine compartment. Maybe the drawing and its parts list will be of some help...

http://www.autoatlanta.com/porsche-p...section=107-05

neilll

2001.

What's confusing me is that number 8 in the link you sent is in some catalogs called a return line and sometimes called a supply line.

Logic tells me supply is on passenger side and return is under the regulator but a pretty good guide on swaps I found online is saying the opposite.

Thanks!

Macster

My general recommendation is if there is any question about a part # to visit a handy Porsche parts department and with your car's VIN have the current part # looked up.

While I often refer to the online parts catalogs when there is a question I rely only upon what the parts manager tells me. The catalogs he has are up to date.

After the parts manager has the proper page up he turns the computer screen my direction so I can see the parts drawing and the part and its location and then I can see the table with the part #.

neilll

Thanks. Im just trying to figure out which side is which for hooking a 3.2 into my 996. The 996 fuel fittings are different sizes so it's pretty clear which is supply and which is return. The 3.2 are the same and I don't have a Boxster in front of me.

On the 996 the regulator is after the injectors and before the return. Ats why I was thinking return would be under the regulator on the 2001.

Macster

Wait. What? Hooking a 3.2 into your 996?

What engine/car are we talking about? I was looking at the first Boxsters: '97 through '04.

If you have a 996 then that's different.

Here's a link that shows the 996 engine's fuel rails and such... This might have a return type system.

http://www.autoatlanta.com/porsche-p...section=107-05