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 )

 
 Reply to this topicStart new topic
> Converting from single to dual webers, how do I go about modifying the fuel pump?
pete914
post Feb 22 2008, 05:52 AM
Post #1


Member
**

Group: Members
Posts: 178
Joined: 21-August 07
From: east coast
Member No.: 8,025
Did a quick search and the only thing that came up was the electrical wiring article which has already been done on the car. Anyway, putting a set of weber idf 40's on my 1.8L. Right now I have a holley single carb on the engine. Do i run two lines ouf the fuel pump?
Anyone know of a good place to read up on this?
Thanks much


Oh, here's a picture of the carbs. You guys might have seen these in the F/S section. They ended up on eBay. What other parts am I going to need besides the bolts for the manifolds? I will need something for the throttle cable to attached somewhere rigid correct? Does the linkage need anything additional? I've actually never seen one of these on a 'teener in person, so I'm a little confused.
(IMG:http://i35.photobucket.com/albums/d189/pba110/914/101_1608.jpg)
(IMG:http://i35.photobucket.com/albums/d189/pba110/914/101_1609.jpg)
(IMG:http://i35.photobucket.com/albums/d189/pba110/914/101_1610.jpg)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Spoke
post Feb 22 2008, 06:24 AM
Post #2


Jerry
*****

Group: Members
Posts: 7,151
Joined: 29-October 04
From: Allentown, PA
Member No.: 3,031
Region Association: None
If you're already running carbs and your fuel pump and pressure regulator are set up properly, just figure out where you want the fuel lines to run, place a T to provide fuel to both carbs. Adjust the pressure regulator to that required by the carbs and drive like hell.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
type47
post Feb 22 2008, 06:25 AM
Post #3


Viermeister
****

Group: Members
Posts: 4,254
Joined: 7-August 03
From: Vienna, VA
Member No.: 994
Region Association: MidAtlantic Region
i'm probably not the one who should answer as i removed a set of carbs and installed a D-jet system. anyway, i don't think you run two lines out of the fuel pump, just run a fuel line between the carbs. the system i removed had a pressure regulator so i don't think you modifly the pump, just insure you have enough pressure which should result in enough flow. if i was you, i'd try to find flow rate requirements for the new dual set and make sure the pump can supply that.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
SGB
post Feb 22 2008, 06:54 AM
Post #4


just visiting
****

Group: Members
Posts: 4,086
Joined: 8-March 03
From: Huntsville, AL
Member No.: 404
Region Association: South East States
i had a pressure regulator but took it out. it isn'tneccessary if you have a low pressure pump.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
purple
post Feb 22 2008, 07:31 AM
Post #5


Pigeon feeders attract me
***

Group: Members
Posts: 938
Joined: 24-July 07
From: Houston, TX
Member No.: 7,942
Region Association: None
I had one fuel like coming from the pump. the other is closed off. I have a T fitting that feeds both carbs.

>=FUEL==T=>====>===carb
................ ||
................ ||
................ ||
................ carb

ignore the periods, i needed them to overcome the forum's text displaying engine

by 'low pressure' pump, SGB means something like a carter (CB) rotary pump. it has an internal regulator that keeps pressure between 3 and 3.5 PSI

using a facet or vibrator fuel pump is NOT GOOD! unless you have a regulator, in which case, you've spent as much as a carter costs.

in other words, use a carter and a T fitting
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rhodyguy
post Feb 22 2008, 08:59 AM
Post #6


Chimp Sanctuary NW. Check it out.
***************

Group: Members
Posts: 22,237
Joined: 2-March 03
From: Orion's Bell. The BELL!
Member No.: 378
Region Association: Galt's Gulch
in direction of flow. tank, filter, pump (single outlet, like the cb unit mentioned), single line to the engine bay, T in bay with the lines branching to the carbs. you'll need to fab up a STOUT bracket to secure the throttle cable.

k
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
pete914
post Feb 22 2008, 03:39 PM
Post #7


Member
**

Group: Members
Posts: 178
Joined: 21-August 07
From: east coast
Member No.: 8,025
Awesome. thanks Everyone. There is a pressure regulator after the pump. However, it doesn't have a psi value. Just 1, 2, 3 or something like that. Perhaps that corresponds to psi though.
I'll take a better look when the weather improves. 38 and raining right now. Lovely.
Can't wait for spring!

yo, type47, how did the installation go? I actually ordered an almost complete d-jet setup (seller thought it was L-jet) thinking I was going to restore the FI. Ended up backing off the project though. I think the dual webers are the answer for now...
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rhodyguy
post Feb 23 2008, 10:30 AM
Post #8


Chimp Sanctuary NW. Check it out.
***************

Group: Members
Posts: 22,237
Joined: 2-March 03
From: Orion's Bell. The BELL!
Member No.: 378
Region Association: Galt's Gulch
if you're going to use an unregulated fuel pump, and one of the mystery fp regulators, you'll need to install a GOOD, ACURATE, gauge downstream from the regulator prior to the T. more connections, more hassles. why bother? my guess is the gauge will cost as much as the new pump. once the reg is set the gauge is redundant.

k
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
brer
post Feb 23 2008, 01:31 PM
Post #9


Advanced Member
****

Group: Members
Posts: 2,555
Joined: 10-March 05
From: san diego
Member No.: 3,736
Region Association: None
I responded to these when they were first posted.
Asked to be considered first in line as well.

While the price was a little on the low side, I think its funny how you posted that they were on ebay when I asked if it was from a member here.

Glad you got a fair deal.
Good luck with them.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
type47
post Feb 23 2008, 01:48 PM
Post #10


Viermeister
****

Group: Members
Posts: 4,254
Joined: 7-August 03
From: Vienna, VA
Member No.: 994
Region Association: MidAtlantic Region
QUOTE(pete914 @ Feb 22 2008, 01:39 PM) *



yo, type47, how did the installation go?


easy since i was basically swapping motors. the motor that came in the car in my avatar was a "race" motor with carbs so it had a carb pump and carb pump wiring. i swapped in a d-jet motor so i installed the d-jet with the motor out. had to reinstall the FI pump though.

you going to the ECC?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

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: 21st April 2025 - 04:27 AM
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 ...