2 fuel lines to carbs, more fuel pump, regulator, plumbing Qs |
|
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. |
|
2 fuel lines to carbs, more fuel pump, regulator, plumbing Qs |
zeezee |
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. |
McMark |
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. |
IronHillRestorations |
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. |
aircraftdesign |
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?
|
sww914 |
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.
|
McMark |
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) |
IronHillRestorations |
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.
|
yeahmag |
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.
|
brant |
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 |
zeezee |
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... 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 |
IronHillRestorations |
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.
|
rhodyguy |
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 |
JFJ914 |
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.
|
johnnie5 |
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 |
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. |
rhodyguy |
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 |
dinomium |
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... |
Rav914 |
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. |
effutuo101 |
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. |
brant |
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) |
zeezee |
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 |
... 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? |
Lo-Fi Version | Time is now: 31st October 2024 - 05:09 PM |
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 ... |