szyki

Hi Everyone,

I'm new to the Porsche Family.
Just started with an '83 model 928S.
Here are some pics of my new buy:


















The car seems to be in pretty solid condition although the paint is bad and the interior is not perfect, too. :-)
It's not that bad with wiring as it seems. The car had some additional equipment as mobile phone and stereo, what added cables to the original system. It's all gone now and the original equipment seems to work.

I brought the 928 back to Europe from the States as non-working condition.

The result for that is very old gas in tank.
In fact, fuel pump and filter died.
Someone replaced a filter and apparently gave up as there is no sign of gas in the filter.
The pump was already dead, so it didn't pump any of it to the new filter.

I started with cleaning the tank and have to get a new pump.

As the general condition of the engine is still a mistery to me and it will have a strong impact on the decision to rebuild this 928 or not, I'm looking for some non-OEM fuel pump.

And here is my question:

Will a 3 bar pump be ok?
Maybe it's too strong?

Manual says, the pressure in the system should be 2,5 bar after just connecting the pump and around 2 bar with running engine.

When I manage to find out, the engine works pretty good, 928 will get brand new Bosch pump as it should be!

Thanks for your help,
Simon.

karl ruiter

There are several approaches to this issue. Mine is this:
1) If there is an in-tank pump get rid of it. You can replace it with a fuel screen / fitting that fits perfectly. Roger has them.
2) I have good luck with walbro pumps. About $100, and exceeds performance specs, last a long time. I avoid no-name pumps from asia, but am not willing to pay the $ for bosch.

James Bailey

You need to be very specific when you order parts as you have a USA spec 928 which really is not like a European spec S ....It uses an electronic injection and operates at different pressures than the basically mechanical CIS that was used in Euro spec cars.
Pretty much any pump will provide enough to make it run and drive except for one off your Jaguar as it is carbureted and not high enough pressure.

szyki

Thanks James for that comment.
I;m not going to dismantle any of two pumps in two tanks, that Jag has :-)
It's got to be a ne product but as I'm not completely sure about condition of my mechanics, I wouldn't like to go into Bosch product. There will be time for that later on, when the engine runs perfectly.

My first thought after purchasing 928 was: OK, but tha't not CIS, in which European versions were equipped in that time.

Does anyone know, what pressure should a pupm give in a AFC engine?

I'm a little afraid, that is I put a 3 bar pump there and the manual says, it should give 2,5 bar when the engine is off and around 2 when operating, I'll destroy pressure regulator of something even more serious.

Gosh, there is a mess in aftermarket pumps in Internet.
Almost all of them are marked as good for my engine and like 99% are a 5 bar pumps for CIS.

The Deputy

Welcome to rennlist and congratulations on your new purchase.

Hopefully, you have it running soon. The five speed should add some excitement to its performance.

Brian.