Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

> MPS reinstall
87m491
post May 7 2017, 02:29 PM
Post #1


Member
**

Group: Members
Posts: 275
Joined: 29-July 12
From: Portland, the original!
Member No.: 14,731
Region Association: North East States
Have just done the whole soft fuel system soup to nuts and I am buttoning up the engine compartment. I went to remount the MPS and the service port on the fuel rail is hitting the MPS body dead center.

(IMG:http://www.914world.com/bbs2/uploads_offsite/i723.photobucket.com-14731-1494188982.1.jpg)

The fuel elbows to the injectors are new and not as pliable as the originals, though a fair bit shorter so any interference should have been less than with the originals. Any one else run into this? Tilting the rail forward or back does not seem to help much as this port hits right in the widest portion of the MPS. Now I know why them MPS only had the top bolt properly installed and sheet metal screws in the bottom two holes.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
2 Pages V  1 2 >  
 Reply to this topicStart new topic
Replies(1 - 19)
914_teener
post May 7 2017, 02:44 PM
Post #2


914 Guru
*****

Group: Members
Posts: 5,201
Joined: 31-August 08
From: So. Cal
Member No.: 9,489
Region Association: Southern California
I think that fuel rain goes on the driver side not the passenger side IIRC.

Also...it's easier to put the screws in first and then slip the MPS into it. Then getting to the bottom one is a PITA.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
saigon71
post May 7 2017, 02:57 PM
Post #3


Advanced Member
****

Group: Members
Posts: 2,000
Joined: 1-June 09
From: Dillsburg, PA
Member No.: 10,428
Region Association: MidAtlantic Region
The rail is on the correct side.

It's tight in there! I recommend using the pre-formed fuel injection hoses on the passenger side instead of simply using regular FI hose. It will give you a little more room. Even using them, I only have about 1/8" of clearance between that fuel rail bolt and my MPS.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
JeffBowlsby
post May 7 2017, 03:24 PM
Post #4


914 Wiring Harnesses
*****

Group: Members
Posts: 8,524
Joined: 7-January 03
From: San Ramon CA
Member No.: 104
Region Association: None
Factory photo does not show the fuel pressure gauge port on the passenger side. It does not conflict with the MPS when its on the drivers side.


Attached image(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914_teener
post May 7 2017, 03:33 PM
Post #5


914 Guru
*****

Group: Members
Posts: 5,201
Joined: 31-August 08
From: So. Cal
Member No.: 9,489
Region Association: Southern California
Yep....and here is a picture of a 74 2.0 with 47k original miles that I took this morning looking down from the drivers side at the Luftenkult.

Looks to me like it is on the drivers side.

Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914_teener
post May 7 2017, 03:50 PM
Post #6


914 Guru
*****

Group: Members
Posts: 5,201
Joined: 31-August 08
From: So. Cal
Member No.: 9,489
Region Association: Southern California
Here is the other side just for kick and giggles.

Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
87m491
post May 7 2017, 03:59 PM
Post #7


Member
**

Group: Members
Posts: 275
Joined: 29-July 12
From: Portland, the original!
Member No.: 14,731
Region Association: North East States
Whoa, that is one busy engine compartment with FP regulator and MPS on the same side. To be clear on my car the test port is factory blocked off AFAIK. Car is a 74 2.0. The port on the drivers side rail is open and feeds the cold start injector. Might be worthwhile to find a VW unit with no port at all to grab 10mm of space.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914_teener
post May 7 2017, 04:17 PM
Post #8


914 Guru
*****

Group: Members
Posts: 5,201
Joined: 31-August 08
From: So. Cal
Member No.: 9,489
Region Association: Southern California
On the 1.7's the port is on the end of the fuel rail on the drivers side and the CS injector is teed from the middle of the feed line.

Not so sure that what you have is the correct fuel rail. Give Bruce Stone a PM he has them all plated and blinged up.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914_teener
post May 7 2017, 04:20 PM
Post #9


914 Guru
*****

Group: Members
Posts: 5,201
Joined: 31-August 08
From: So. Cal
Member No.: 9,489
Region Association: Southern California
QUOTE(87m491 @ May 7 2017, 02:59 PM) *

Whoa, that is one busy engine compartment with FP regulator and MPS on the same side. To be clear on my car the test port is factory blocked off AFAIK. Car is a 74 2.0. The port on the drivers side rail is open and feeds the cold start injector. Might be worthwhile to find a VW unit with no port at all to grab 10mm of space.


FP regulator is on the driver side in the pic I posted it is on the right side.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
JeffBowlsby
post May 7 2017, 04:28 PM
Post #10


914 Wiring Harnesses
*****

Group: Members
Posts: 8,524
Joined: 7-January 03
From: San Ramon CA
Member No.: 104
Region Association: None
QUOTE(87m491 @ May 7 2017, 02:59 PM) *

Whoa, that is one busy engine compartment with FP regulator and MPS on the same side. To be clear on my car the test port is factory blocked off AFAIK. Car is a 74 2.0. The port on the drivers side rail is open and feeds the cold start injector. Might be worthwhile to find a VW unit with no port at all to grab 10mm of space.


That's not a FP regulator above the MPS...take another guess what it is.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
iankarr
post May 7 2017, 04:40 PM
Post #11


The wrencher formerly known as Cuddy_K
****

Group: Members
Posts: 2,480
Joined: 22-May 15
From: Heber City, UT
Member No.: 18,749
Region Association: Intermountain Region
Decel valve?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
JeffBowlsby
post May 7 2017, 04:49 PM
Post #12


914 Wiring Harnesses
*****

Group: Members
Posts: 8,524
Joined: 7-January 03
From: San Ramon CA
Member No.: 104
Region Association: None
QUOTE(cuddyk @ May 7 2017, 03:40 PM) *

Decel valve?


(IMG:style_emoticons/default/sunglasses.gif) You nailed it.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
iankarr
post May 7 2017, 04:58 PM
Post #13


The wrencher formerly known as Cuddy_K
****

Group: Members
Posts: 2,480
Joined: 22-May 15
From: Heber City, UT
Member No.: 18,749
Region Association: Intermountain Region
QUOTE(Jeff Bowlsby @ May 7 2017, 06:49 PM) *

QUOTE(cuddyk @ May 7 2017, 03:40 PM) *

Decel valve?


(IMG:style_emoticons/default/sunglasses.gif) You nailed it.

Thanks, professor!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914_teener
post May 7 2017, 05:01 PM
Post #14


914 Guru
*****

Group: Members
Posts: 5,201
Joined: 31-August 08
From: So. Cal
Member No.: 9,489
Region Association: Southern California
Jeff....you are much nicer than I am.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
iankarr
post May 7 2017, 05:05 PM
Post #15


The wrencher formerly known as Cuddy_K
****

Group: Members
Posts: 2,480
Joined: 22-May 15
From: Heber City, UT
Member No.: 18,749
Region Association: Intermountain Region
QUOTE(914_teener @ May 7 2017, 07:01 PM) *

Jeff....you are much nicer than I am.

(IMG:style_emoticons/default/lol-2.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
saigon71
post May 7 2017, 08:10 PM
Post #16


Advanced Member
****

Group: Members
Posts: 2,000
Joined: 1-June 09
From: Dillsburg, PA
Member No.: 10,428
Region Association: MidAtlantic Region
Interesting...

I've got nipples on both my fuel rails. The drivers side is connected to the FI system - cold start valve? I've always used the passenger side to check fuel pressure.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jcd914
post May 7 2017, 09:59 PM
Post #17


Advanced Member
****

Group: Members
Posts: 2,081
Joined: 7-February 08
From: Sacramento, CA
Member No.: 8,684
Region Association: Northern California
With a couple of wire ties around the intake runners and the fuel rail you can gently pull the fuel rail toward the intake runners and away from the MPS. Watch the injector elbows, you don't want to kink the hose and you don't want too much tension on the injectors.

Jim
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
87m491
post May 8 2017, 07:19 AM
Post #18


Member
**

Group: Members
Posts: 275
Joined: 29-July 12
From: Portland, the original!
Member No.: 14,731
Region Association: North East States
Not too much give on the relatively short, and stiff new lines. I will try again. I think it might be easier to find another rail without the port. Surprisingly, I have not find a VW site that lists them yet....


QUOTE(jcd914 @ May 7 2017, 07:59 PM) *

With a couple of wire ties around the intake runners and the fuel rail you can gently pull the fuel rail toward the intake runners and away from the MPS. Watch the injector elbows, you don't want to kink the hose and you don't want too much tension on the injectors.

Jim
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bdstone914
post May 8 2017, 07:34 AM
Post #19


bdstone914
****

Group: Members
Posts: 4,531
Joined: 8-November 03
From: Riverside CA
Member No.: 1,319
To my knowledge all Type IV injected engines used one rail with a port and one without.
I have many fuel rails but only those with ports are left, no rails without the test port.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
BillC
post May 8 2017, 08:01 AM
Post #20


Senior Member
***

Group: Members
Posts: 546
Joined: 24-April 15
From: Silver Spring, MD
Member No.: 18,667
Region Association: MidAtlantic Region
87m491 --

According to the diagram here: http://www.pelicanparts.com/914/technical_...4_20FI_diag.htm , the '74 2.0 looks like it is supposed to have test ports on both fuel injector rails, with the driver's side test port feeding the cold start valve.

Check both rails, and see if one of the test ports is off-center. If so, that may be the one that is supposed to go on the passenger side. I'm just guessing, since I've never been that deep into a '74's engine compartment.

Also, when I re-did the fuel lines on my '73, the MPS bracket was held in with one machine screw on top and two sheet metal screws on the bottom. So yours may have been mounted correctly.

Are there any wear marks on your MPS, where the test port plug may have been rubbing before?

Edit: just had a thought: Are the new fuel injector elbows taller than the old ones you took off? Maybe you can trim the new elbows down to lower the rail and get the clearance you need.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

2 Pages V  1 2 >
Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Switch to: Standard · Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 1st June 2024 - 01:44 PM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...