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Join Date: Jan 2002
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912e hoses

Does anybody know if there is an accurate diagram for the hoses on the 912e? The nearest I can find is Pete Klager's 1.8L Hose Diagrams in the technical section of http://www.914fan.net/

I do not expect the lengths (and perhaps diameters,) Klager specifies to be accurate for the 912e, but are the connections for the 912e basically the same for the 914 1.8 Liter L-jetronics?

Tom Zuraw

Last edited by thomasz; 01-02-2008 at 01:53 PM..
Old 04-24-2002, 01:05 PM
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Here's what I have.....obviously not to any scale, but shows the basic routing. It's a little hard to make out, but the fuel lines are shown as "thicker", the thin lines being elec. As far as replacing the lines with non-factory spec, you can safely do it using high quality FI fuel line of the same inner diameter. Since many of the "pressurized side" of the system are clamped on originally, you can replace the fuel line. The only problem will be the in/out of the fuel filter cannister. I've seen a couple 912E's where the owners converted to a more readily available (& less costly) fuel filter. Just remember that the system is pressurized to over 30 PSI, so look for something that's metal and from a similar FI setup.
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Old 04-25-2002, 08:15 AM
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Distributor vacuum clarification requested

Thanks! I recognize that as basically the same as the drawing on page 6 of Porsche's 912E Service-Information Bulletin. The drawing is lacking the hose routing for the Vacuum Limiter (a.k.a. Backfire Valve.)

The sources I own are:
*Porsche 912E Service-Information 4547.21
*Porsche 912E Workshop Manual 48 14. 21 1975 edition
*Bosch L-Jetronic Technical Instruction 1982
*Bosch Electronic Gasoline Fuel-Injection System with Lambda Closed-Loop Control L-Jetronic Technical Instruction 1985
*Bosch L-Jetrionic Service Guide 1984
*Bosch D & L Jetronic Service Manual 1975 binder w/ 1979 supplements
*Clymer Porsche 911 & 912 1965-1976
*Bosch Fuel Injection & Engine Management by Probst
*How to Tune & Modify Bosch Fuel Injection by Watson

So I have references for all the particulars of the L-Jetronics. But not one of the references has a picture or diagram of the vacuum hoses etc. For instance where the EGR control vacuum ties into the air box is not shown. God help the poor soul who takes everything apart without a map. I am in good shape but I was hoping somebody had already developed that map.

My main question is that the distributor has advance and retard vacuum lines. The retard unit is connected but my advance side has a short hose with no connection. Bentley's Type 2 Manual 1968 through 1979 for the VW bus is not much help either. Pete Klager's 1.8L Hose Diagrams has the advance side tied into a "T" by the EGR valve and I was wondering if that is true for the 912e.

DOES THE DISTRIBUTOR VACUUM ADVANCE HOSE GET ATTACHED TO ANYTHING?

(I'm not shouting, I just want to highlight my question in all the other stuff.)

Tom Zuraw

Last edited by thomasz; 01-02-2008 at 01:54 PM..
Old 04-25-2002, 04:28 PM
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My 912E (2-owner, rock-stock) definitely had the advance vacuum hose and the EGR valve on the same line with a T-fitting.
Old 04-25-2002, 08:13 PM
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Photos or Xerox anyone?

I have been all through Porsche parts PET and all my other sources. (PET even itemizes hoses and lengths.)

I can find no "T" in the parts lists, nor any little piece of hose to act as a splice to a "T". I also can not find any place to connect the hose to.

Tom Zuraw

Last edited by thomasz; 01-02-2008 at 01:54 PM..
Old 05-21-2002, 08:13 PM
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ThomasZ,

Check my reply to Gary's question on the May 1st Thermal Reactor post at http://www.hillmanimages.com/sc912.

I believe that I may have answered one of your questions...

Hope this helps...

Bob
Old 05-23-2002, 04:48 PM
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More info on no-hose. (Isn't he a pitcher?)

I just had my 912e to a vintage mechanic who worked on them at a dealer when they were new. He pointed out that the advance portion of the vacuum for the distributor is not hooked up. He said that they often put a piece of hose on the nipple so the rain doesn't get inside.

And he proved it by page 28-1 of the official Porsche service manual. In the remarks for the distributor it states that:
"Centrifugal and single action vacuum control (retarded)."
And on the next page when it gives timing instructions it states:
"...Pull off vacuum hose at either distributor or throttle housing."
Alone this sentence could be interpreted any either way but in combination with the previous statement, hose vs. hoses is significant.

Also since I cannot find any "T" or little hose in the parts list, I accept it as true that the vacuum side is left open to the air. I'm also sorry that I missed it in my previous read of the service manual.

Tom Zuraw

Last edited by thomasz; 01-02-2008 at 01:54 PM..
Old 09-12-2002, 10:31 AM
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Old 09-12-2002, 10:31 AM
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