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> 2 fuel lines to carbs, more fuel pump, regulator, plumbing Qs
zeezee
post Feb 19 2009, 09:57 PM
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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.
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McMark
post Feb 20 2009, 01:54 AM
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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.
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IronHillRestorations
post Feb 20 2009, 07:29 AM
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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.
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aircraftdesign
post Feb 20 2009, 07:37 PM
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any suggestions on a good regulator for a carb conversion?
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sww914
post Feb 20 2009, 07:49 PM
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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.
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McMark
post Feb 20 2009, 07:54 PM
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Do not run this style regulator. No no.


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IronHillRestorations
post Feb 20 2009, 10:02 PM
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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.
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yeahmag
post Feb 20 2009, 10:11 PM
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Just run the CB Rotary pump (or the like) and don't worry about a return.
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brant
post Feb 20 2009, 10:31 PM
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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
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zeezee
post Mar 5 2009, 03:27 AM
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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
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IronHillRestorations
post Mar 5 2009, 07:12 AM
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The only way a Facet will work for you is up front, lower than the tank.
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rhodyguy
post Mar 5 2009, 09:42 AM
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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
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JFJ914
post Mar 5 2009, 09:58 AM
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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.
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johnnie5
post Mar 5 2009, 10:04 AM
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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.
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rhodyguy
post Mar 5 2009, 10:08 AM
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Chimp Sanctuary NW. Check it out.
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never mind.

k
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dinomium
post Mar 5 2009, 12:44 PM
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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...
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Rav914
post Mar 5 2009, 02:37 PM
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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.
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effutuo101
post Mar 5 2009, 02:48 PM
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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.
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brant
post Mar 5 2009, 09:58 PM
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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:


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zeezee
post Mar 6 2009, 01:02 AM
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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?
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