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
> 2 fuel lines to carbs, more fuel pump, regulator, plumbing Qs
zeezee
post Feb 19 2009, 09:57 PM
Post #1


Member
**

Group: Members
Posts: 115
Joined: 16-October 08
From: san ramon, ca
Member No.: 9,651
Region Association: Northern California



The PO connected both fuel lines together > filter > pump > carbs.

I'm assuming one line was originaly a fuel return line - so it is now drawing crumbs off the bottom of the tank ... not thru the tank strainer.

Is this a safe setup? Should I be concerned about pluggin up a carb jet?

The filter seems clean. I don't have a problem with fuel flow. POR-15ing the tank is on my to-do list.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
McMark
post Feb 20 2009, 01:54 AM
Post #2


914 Freak!
***************

Group: Retired Admin
Posts: 20,179
Joined: 13-March 03
From: Grand Rapids, MI
Member No.: 419
Region Association: None



I usually plug unused fuel lines with a section of solid steel rod and a fuel clamp.

Get that tank cleaned up before it really fouls up your carbs. Yes, I know you have a filter. It's not enough. You'll be surprised what snuck by if you open up the carbs.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
IronHillRestorations
post Feb 20 2009, 07:29 AM
Post #3


I. I. R. C.
*****

Group: Members
Posts: 6,768
Joined: 18-March 03
From: West TN
Member No.: 439
Region Association: None



You can run a return line, if you want, after a pressure regulator. You need to make sure the correct (strainer)supply line supplies the system and the return is actually the return.

I've only done this on one car, at the request of the owner. Unless you are racing with huge fuel delivery carbs, a single line works just fine.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
aircraftdesign
post Feb 20 2009, 07:37 PM
Post #4


Newbie
*

Group: Members
Posts: 13
Joined: 2-January 09
From: huntington beach, ca
Member No.: 9,893
Region Association: None



any suggestions on a good regulator for a carb conversion?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
sww914
post Feb 20 2009, 07:49 PM
Post #5


Advanced Member
****

Group: Members
Posts: 2,439
Joined: 4-June 06
Member No.: 6,146
Region Association: None



The Holley regulator works great. I've had mine on the car for years, it even survived a fire and it still works. I had to replace the gauge after the fire.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
McMark
post Feb 20 2009, 07:54 PM
Post #6


914 Freak!
***************

Group: Retired Admin
Posts: 20,179
Joined: 13-March 03
From: Grand Rapids, MI
Member No.: 419
Region Association: None



Do not run this style regulator. No no.


Attached image(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
IronHillRestorations
post Feb 20 2009, 10:02 PM
Post #7


I. I. R. C.
*****

Group: Members
Posts: 6,768
Joined: 18-March 03
From: West TN
Member No.: 439
Region Association: None



There used to be a fuel pressure regulator that was self adjusting using intake vacuum. I don't remember what it was called, but I saw one in VW & Porsche way long ago, the reviewer said it was the goods.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
yeahmag
post Feb 20 2009, 10:11 PM
Post #8


Advanced Member
****

Group: Members
Posts: 2,442
Joined: 18-April 05
From: Pasadena, CA
Member No.: 3,946
Region Association: Southern California



Just run the CB Rotary pump (or the like) and don't worry about a return.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
brant
post Feb 20 2009, 10:31 PM
Post #9


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

Group: Members
Posts: 11,771
Joined: 30-December 02
From: Colorado
Member No.: 47
Region Association: Rocky Mountains



returns are ultimately superior
may not always be necessary, but definitely superior for power.. and for racing.
I have 3 teeners right now.. all with returns
(2 carbed, and of course the one with f.i.)

I always run returns
there are many different ways to plumb the system
all covered in previous threads
b
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
zeezee
post Mar 5 2009, 03:27 AM
Post #10


Member
**

Group: Members
Posts: 115
Joined: 16-October 08
From: san ramon, ca
Member No.: 9,651
Region Association: Northern California



There certainly is no shortage on talk about fuel pumps, regulators, etc on this forum.

I have read a ton of it and have desided my fuel delivery setup has several issues. (Like the facet clicker pump is mounted too high - next to the battery (IMG:style_emoticons/default/blink.gif) ).

So, my next project on the car is to redo the lines, filter, pump...

Attached Image

I plan on doing option E above (two IDF 44s on a 2.0L).

Regarding the return regulator (3ish psi ):

Brant, I can't find the cheapo facet regulator you've mentioned.
Not interested in $300 for a Holley return regulator.
Does it have to be a return regulator?
(Inexpensive) Regulator suggestions?

Regarding the pump:

The CBPerformance Rotory pump gets good reviews.

But I'm assuming I can't have a self regulated pump (at 3psi) AND a regulator on the return (at 3psi) ... then there wouldn't be ANY fuel circulation.

So, would the 5psi pump provide enough circulation?
If not, what kind of pump should I be looking at?




Picture credit to Eddie W - lifted from here
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
IronHillRestorations
post Mar 5 2009, 07:12 AM
Post #11


I. I. R. C.
*****

Group: Members
Posts: 6,768
Joined: 18-March 03
From: West TN
Member No.: 439
Region Association: None



The only way a Facet will work for you is up front, lower than the tank.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rhodyguy
post Mar 5 2009, 09:42 AM
Post #12


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

Group: Members
Posts: 22,192
Joined: 2-March 03
From: Orion's Bell. The BELL!
Member No.: 378
Region Association: Galt's Gulch



forget the facet. period. they're VERY noisy. even when isolated from the car's chassis. while the return line version may be a superior setup, i've never felt the need for one on my car. during VERY warm weather and only parked AFTER driving have i ever experienced what i would consider a "hot" fuel issue which quicky subsides after the restart.

with version E the return line is going to begin on the opposite side of the engine and return to where you've started. you will have fuel line running all over the engine compartment and the fuel sitting idle in the lines and float bowls is still going to get warm. where do you plan on locating the pump?

imho you're making quite a bit of work of this. cap return line @ tank, renew supply line at tank, renew line to filter, new line to pump, new line to 'T' in engine compartment, plumb to the carbs and be done with it. i like to keep it simple.

k
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
JFJ914
post Mar 5 2009, 09:58 AM
Post #13


Senior Member
***

Group: Benefactors
Posts: 813
Joined: 13-June 03
From: Alpharetta, GA
Member No.: 814
Region Association: South East States



Use the Mallory 4309 return regulator, $84.95 from SUMMIT. I'm going to use the stock FI pump up front like Fig E. Remember, pumps are not inherently high or low pressure, but volume against resistance. This regulator will handle a 140gph pump. I don't know what a D-Jet pump is rated at, it's got to be less than that.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
johnnie5
post Mar 5 2009, 10:04 AM
Post #14


914 lover
**

Group: Members
Posts: 375
Joined: 14-October 08
From: San Diego, CA
Member No.: 9,644
Region Association: Southern California



QUOTE(rhodyguy @ Mar 5 2009, 07:42 AM) *

imho you're making quite a bit of work of this. cap return line @ tank, renew supply line at tank, renew line to filter, new line to pump, new line to 'T' in engine compartment, plumb to the carbs and be done with it. i like to keep it simple.

(IMG:style_emoticons/default/agree.gif) I have run my fuel system in the same manner, except I have 2 filters. 1 up front with the pump , and a 2nd filter before the T. Works perfectly.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rhodyguy
post Mar 5 2009, 10:08 AM
Post #15


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

Group: Members
Posts: 22,192
Joined: 2-March 03
From: Orion's Bell. The BELL!
Member No.: 378
Region Association: Galt's Gulch



never mind.

k
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
dinomium
post Mar 5 2009, 12:44 PM
Post #16


Git on a chair son, all the good stuff is goin over yer head!
****

Group: Benefactors
Posts: 2,777
Joined: 2-January 03
From: Bremerton, WA
Member No.: 74
Region Association: Pacific Northwest




Brant, I can't find the cheapo facet regulator you've mentioned.
Not interested in $300 for a Holley return regulator.
Does it have to be a return regulator?
(Inexpensive) Regulator suggestions?

Holly from Summit
27.95 from Summit racing... 1-4 lbs pressure...
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Rav914
post Mar 5 2009, 02:37 PM
Post #17


All-weather fan
***

Group: Members
Posts: 738
Joined: 15-April 07
From: WA
Member No.: 7,669
Region Association: None



Does that Holley pump need to be adjusted? I know it says 1-4 psi, but would I need to fine-tune it down to 3.5 psi?

Sorry for the hi-jack but I just bought the same reg for my carb conversion.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
effutuo101
post Mar 5 2009, 02:48 PM
Post #18


Advanced Member
****

Group: Members
Posts: 2,735
Joined: 10-April 05
From: Lemon Grove
Member No.: 3,914
Region Association: Southern California



I posted my thoughts on another thread.
Here is what I use:
http://www.aeromotiveinc.com/products.php
I am still in the testing phase, but have been impressed with the ease of use and accuracy thus far.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
brant
post Mar 5 2009, 09:58 PM
Post #19


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

Group: Members
Posts: 11,771
Joined: 30-December 02
From: Colorado
Member No.: 47
Region Association: Rocky Mountains



it doesn't have to be a regulator designed for return
I've used option E previously with the cheap regulator shown in marks post #6 in this thread. make sure you put a guage ahead of the regulator to see what kind of back pressure your building to.

also make sure you don't mount the guage on the motor or fuel rail where it will vibrate and eventually crack/leak. I helped put out a 911 on fire that was plumbed that way once.

I recently just upgraded my race car fuel pump yet again. I removed my pmo regulator (to save weight) and went with one of the decent rotary pumps with built in internal regulation. I'm using option B now, but with no regulator. My fuel pressure guage verifies this is working.

Here is the new aluminum mounting bracket we fabbed, along with the new smart bar:


Attached image(s)
Attached Image Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
zeezee
post Mar 6 2009, 01:02 AM
Post #20


Member
**

Group: Members
Posts: 115
Joined: 16-October 08
From: san ramon, ca
Member No.: 9,651
Region Association: Northern California



QUOTE(brant @ Mar 5 2009, 07:58 PM) *

... I'm using option B now, but with no regulator. My fuel pressure guage verifies this is working...


Option B would be easier ... but I don't get it. The fuel free flows right back into the tank... there is nothing to build pressure against.

Is the return line considerably smaller than the supply side?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post

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:

 



- Lo-Fi Version Time is now: 31st October 2024 - 05:09 PM