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 )

2 Pages V  1 2 >  
 Reply to this topicStart new topic
> Return fuel line with carbs?, Anyone running return fuel line with cabs?
lonewolfe
post Feb 3 2018, 07:06 PM
Post #1


Senior Member
***

Group: Members
Posts: 819
Joined: 12-September 11
From: Oakland, CA
Member No.: 13,549
Region Association: Northern California
Are any of you running a retun fuel line with carbs?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
struckn
post Feb 3 2018, 08:38 PM
Post #2


Senior Member
***

Group: Members
Posts: 1,069
Joined: 9-November 11
From: South Central York Pennsyvania
Member No.: 13,764
Region Association: MidAtlantic Region
I'm not running a return line...actually I had Translog GT replace the Plastic Lines with Stainless and they put the Stainless feed line in but left the return line in, disconnected, should the car ever need it in the future.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
brant
post Feb 3 2018, 08:51 PM
Post #3


914 Wizard
**********

Group: Members
Posts: 11,949
Joined: 30-December 02
From: Colorado
Member No.: 47
Region Association: Rocky Mountains
Yes.

A return fuel line in s a good thing.
Keeps the fuel entering the carb cooler
Potentially more up and less vapor lock

Perhaps not noticeable but? Still better andthere is a reason all factory systems use a return
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Larmo63
post Feb 3 2018, 09:05 PM
Post #4


Advanced Member
****

Group: Members
Posts: 4,267
Joined: 3-March 14
From: San Clemente, Ca
Member No.: 17,068
Region Association: Southern California
On a six with Webers, I'm not sure how it works?

Splain? (IMG:style_emoticons/default/blink.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jcambo7
post Feb 3 2018, 09:45 PM
Post #5


Senior Member
***

Group: Members
Posts: 1,691
Joined: 24-December 08
From: Graham, WA
Member No.: 9,867
Region Association: Pacific Northwest
QUOTE(Larmo63 @ Feb 3 2018, 10:05 PM) *

On a six with Webers, I'm nt sure how it works?

Splain? (IMG:style_emoticons/default/blink.gif)

(IMG:style_emoticons/default/agree.gif)
Where would the return line attach to on the carbs?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
porschetub
post Feb 3 2018, 11:11 PM
Post #6


Advanced Member
****

Group: Members
Posts: 4,816
Joined: 25-July 15
From: New Zealand
Member No.: 18,995
Region Association: None
QUOTE(Larmo63 @ Feb 4 2018, 04:05 PM) *

On a six with Webers, I'm nt sure how it works?

Splain? (IMG:style_emoticons/default/blink.gif)

(IMG:style_emoticons/default/agree.gif) tell us more????.
User is online!Profile CardPM
Go to the top of the page
+Quote Post
mmascari
post Feb 3 2018, 11:17 PM
Post #7


Member
**

Group: Members
Posts: 322
Joined: 1-September 14
From: Concord, CA
Member No.: 17,850
Region Association: None
QUOTE(porschetub @ Feb 3 2018, 09:11 PM) *

QUOTE(Larmo63 @ Feb 4 2018, 04:05 PM) *

On a six with Webers, I'm nt sure how it works?

Splain? (IMG:style_emoticons/default/blink.gif)

(IMG:style_emoticons/default/agree.gif) tell us more????.


I guess its not needed on a six but I am running a fuel pressure regulator that has a return on it so I have it connected back to the gas tank.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
brant
post Feb 4 2018, 08:19 AM
Post #8


914 Wizard
**********

Group: Members
Posts: 11,949
Joined: 30-December 02
From: Colorado
Member No.: 47
Region Association: Rocky Mountains
QUOTE(Larmo63 @ Feb 3 2018, 08:05 PM) *

On a six with Webers, I'm not sure how it works?

Splain? (IMG:style_emoticons/default/blink.gif)



Attached thumbnail(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Krieger
post Feb 4 2018, 10:59 PM
Post #9


Advanced Member
****

Group: Members
Posts: 4,803
Joined: 24-May 04
From: Santa Rosa CA
Member No.: 2,104
Region Association: None
To be clear the rectangle is the filter. Circle is the pump. Triangle/ hex is the regulator. Right Brant?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
gothspeed
post Feb 5 2018, 12:21 AM
Post #10


Senior Member
***

Group: Members
Posts: 1,539
Joined: 3-February 09
From: SoCal
Member No.: 10,019
Region Association: None
I like option E with double barb banjos on the carbs (IMG:style_emoticons/default/smile.gif)
But it would depend on the type and range of regulator. Second choice would be option D with a Y feeding carbs.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
lonewolfe
post Feb 5 2018, 12:41 AM
Post #11


Senior Member
***

Group: Members
Posts: 819
Joined: 12-September 11
From: Oakland, CA
Member No.: 13,549
Region Association: Northern California
I have Dellorto carbs so one has the menu intake line & a double banjo that then feeds the second carb. I was thing if both carbs had double banjo’s that the second outlet on the the slave carb could run as a return line. Do you guys think that would work ok? I do not believe my fuel pressure regulator has an option for a return line.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bbrock
post Feb 5 2018, 08:27 AM
Post #12


914 Guru
*****

Group: Members
Posts: 5,269
Joined: 17-February 17
From: Montana
Member No.: 20,845
Region Association: Rocky Mountains
QUOTE(gothspeed @ Feb 4 2018, 11:21 PM) *

I like option E with double barb banjos on the carbs (IMG:style_emoticons/default/smile.gif)
But it would depend on the type and range of regulator. Send choice would be optio D with a Y feeding carbs.


To make sure I understand correctly, C and D would require a bypass style regulator while B and E would use blocking type. Do I have that right?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
gothspeed
post Feb 5 2018, 08:42 AM
Post #13


Senior Member
***

Group: Members
Posts: 1,539
Joined: 3-February 09
From: SoCal
Member No.: 10,019
Region Association: None
QUOTE(bbrock @ Feb 5 2018, 06:27 AM) *

QUOTE(gothspeed @ Feb 4 2018, 11:21 PM) *

I like option E with double barb banjos on the carbs (IMG:style_emoticons/default/smile.gif)
But it would depend on the type and range of regulator. Second choice would be option D with a Y feeding carbs.


To make sure I understand correctly, C and D would require a bypass style regulator while B and E would use blocking type. Do I have that right?

Yes, there are regulators that 'send out' a regulated target pressure (inline) and some that 'bleed out' anything over your target pressure (return). (IMG:style_emoticons/default/smile.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ChrisFoley
post Feb 5 2018, 08:46 AM
Post #14


I am Tangerine Racing
*****

Group: Members
Posts: 7,986
Joined: 29-January 03
From: Bolton, CT
Member No.: 209
Region Association: None
QUOTE(bbrock @ Feb 5 2018, 10:27 AM) *

QUOTE(gothspeed @ Feb 4 2018, 11:21 PM) *

I like option E with double barb banjos on the carbs (IMG:style_emoticons/default/smile.gif)
But it would depend on the type and range of regulator. Send choice would be optio D with a Y feeding carbs.


To make sure I understand correctly, C and D would require a bypass style regulator while B and E would use blocking type. Do I have that right?

Yes, except that in option B the upstream regulator is useless. A blocking regulator is needed downstream.

We had a 914 here recently which came with a single carb that had an internal regulator. It needed the return line to work.
Otherwise I don't think I've ever seen a 914 with a carb setup in my shop (other than stock 914-6) that used a return line.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
anderssj
post Feb 5 2018, 09:48 AM
Post #15


Dog is my copilot...
***

Group: Members
Posts: 1,736
Joined: 28-January 03
From: VA
Member No.: 207
Region Association: MidAtlantic Region
I've been running dual dell's with an "option C" return line since the early 1980s . . . works well. (IMG:style_emoticons/default/smile.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bbrock
post Feb 5 2018, 10:22 AM
Post #16


914 Guru
*****

Group: Members
Posts: 5,269
Joined: 17-February 17
From: Montana
Member No.: 20,845
Region Association: Rocky Mountains
QUOTE(Racer Chris @ Feb 5 2018, 07:46 AM) *

QUOTE(bbrock @ Feb 5 2018, 10:27 AM) *

QUOTE(gothspeed @ Feb 4 2018, 11:21 PM) *

I like option E with double barb banjos on the carbs (IMG:style_emoticons/default/smile.gif)
But it would depend on the type and range of regulator. Send choice would be optio D with a Y feeding carbs.


To make sure I understand correctly, C and D would require a bypass style regulator while B and E would use blocking type. Do I have that right?

Yes, except that in option B the upstream regulator is useless. A blocking regulator is needed downstream.

We had a 914 here recently which came with a single carb that had an internal regulator. It needed the return line to work.
Otherwise I don't think I've ever seen a 914 with a carb setup in my shop (other than stock 914-6) that used a return line.


And that answers my next question about option B (IMG:style_emoticons/default/biggrin.gif) I'm planning to run a return line on my carbed /4. I might want to switch back to FI in the future so it seems like a good way to future-proof the setup. Plus, I like the idea of a return line anyway.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
brant
post Feb 5 2018, 12:37 PM
Post #17


914 Wizard
**********

Group: Members
Posts: 11,949
Joined: 30-December 02
From: Colorado
Member No.: 47
Region Association: Rocky Mountains
QUOTE(Krieger @ Feb 4 2018, 09:59 PM) *

To be clear the rectangle is the filter. Circle is the pump. Triangle/ hex is the regulator. Right Brant?



correct
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Socalandy
post Feb 5 2018, 09:54 PM
Post #18


Its got to be Yellow!!!
****

Group: Members
Posts: 2,432
Joined: 29-August 09
From: Orange
Member No.: 10,742
Region Association: Southern California
covered here, im running tangerine lines with PMO regulator. Works great (IMG:style_emoticons/default/aktion035.gif)

http://www.914world.com/bbs2/index.php?showtopic=246855
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
North Coast Jim
post Feb 6 2018, 08:09 AM
Post #19


Member
**

Group: Members
Posts: 339
Joined: 11-December 15
From: Northern Ohio
Member No.: 19,450
Region Association: MidAtlantic Region
No return line in use with 44 IDFs. Car runs great after sorting out the jetting issues. I used the tunnel grommets to run a 2 conductor wire for power as the fuel pump was relocated to the front under the gravel panel.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
1adam12
post Feb 21 2018, 11:03 AM
Post #20


Member
**

Group: Members
Posts: 209
Joined: 25-May 17
From: Chino Hills, CA
Member No.: 21,132
Region Association: Southern California
What's up guys! I just purchased a pair of Dell 40's which I'm currently rebuilding at the moment. I like the idea of running a fuel return for 1.7 as some have discussed but my question has to do with the fuel pump and regulator set up. Can you run a low pressure (rotary style) fuel pump i.e. (CB Performance / Carter) with Option E and delete the regulator from the drawing? Or would I need to keep a high pressure set up with a good aftermarket regulator like Mallory ect. to make up for the amount of flow for the return and not flood the carbs?
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: Standard · Switch to: Linear+ · Switch to: Outline

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

- Lo-Fi Version Time is now: 9th May 2025 - 11:22 PM
Invision Power Board v9.1.4 © 2025  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 ...