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Author Topic: Fuel Return lines  (Read 20568 times)

redge

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Re: Fuel Return lines
« Reply #15 on: December 17, 2010, 05:35:10 AM »
Thanks ,Stingr69
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motorman

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Re: Fuel Return lines
« Reply #16 on: December 18, 2010, 01:37:00 AM »
First you can use a needle/seat assembly that does not have the “windows” in the bottom of the seat. This will block the fuel from being able to enter the seat and flow back.

if you do this you can run out of fuel on the high performance engines because all the fuel has to come up passed the needle and that is a restriction. most rebuild kits come with out a windowed needle seat and i would recommend you drill a .125 diameter hole thru the needle seat right above the seat to allow the fuel to come out into the float bowl without having to go up passed the needle
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new Camaros owned 68 and 69 Z-28. new Corvettes owned 59,62,63,64,65,66,97,99 02,05 and 08. retired race engine builder, former NASCAR tech inspector

JohnZ

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Re: Fuel Return lines
« Reply #17 on: December 18, 2010, 04:07:24 PM »
Guys -

"Motorman" is Clem, who I mentioned in my reply #10; decades of experience as a BB race engine builder, NASCAR Tech Inspector, carb rebuilder, and drag racer. Welcome, Clem!
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HOT3O2

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Re: Fuel Return lines
« Reply #18 on: December 19, 2010, 01:01:08 AM »
Great to have another expert on board with that kind of knowledge. I look forward to hearing more from you in the future Clem. Thanks, Rick
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Rick
69 RS/Z28

JoeC

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Re: Fuel Return lines
« Reply #19 on: December 22, 2010, 12:13:41 PM »
Welcome to the site Clem

in that long post they say to applying a coat of JBWeld.

I have read that JB Weld and ethanol don't mix. It seems that the ethanol blended gasoline will soften the JB Weld.
I don't think JB Weld should be used in a carb but they do claim it is gasoline "resistant"
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motorman

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Re: Fuel Return lines
« Reply #20 on: December 25, 2010, 04:32:02 PM »
Quote from: JoeC on December 22, 2010, 12:13:41 PM
Welcome to the site Clem

in that long post they say to applying a coat of JBWeld.

I have read that JB Weld and ethanol don't mix. It seems that the ethanol blended gasoline will soften the JB Weld.
I don't think JB Weld should be used in a carb but they do claim it is gasoline "resistant"
here you go. http://www.resinlab.com/E85/e85index.html
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new Camaros owned 68 and 69 Z-28. new Corvettes owned 59,62,63,64,65,66,97,99 02,05 and 08. retired race engine builder, former NASCAR tech inspector

motorman

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Re: Fuel Return lines
« Reply #21 on: June 10, 2011, 07:42:48 PM »
when a Q jet is upside down the float holds the needle valve closed just from the weight of the float just the same as any other carb. that is how i check the needle/seat for leaks when i rebuild them by turning the Q jet upside down and applying air pressure to the fuel inlet
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new Camaros owned 68 and 69 Z-28. new Corvettes owned 59,62,63,64,65,66,97,99 02,05 and 08. retired race engine builder, former NASCAR tech inspector

click

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Re: Fuel Return lines
« Reply #22 on: June 21, 2011, 05:33:49 PM »
 Earlier in this thread, Kurt mentioned that the LM1 did not have the return line. I think he might be mistaken on that one. My LM1 with Qjet has the return line. Maybe Kurt will clarify for us.
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MRPENNYPKR

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Re: Fuel Return lines
« Reply #23 on: June 22, 2011, 02:46:08 AM »
My 69 L48 Q jet also has a fuel return line.  Shown in assembly manual page 298 UPC L48 A3.
Tony
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KurtS

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Re: Fuel Return lines
« Reply #24 on: June 23, 2011, 04:06:07 PM »
My post was referring only to full-size cars. I added a note at the bottom of the post to clarify.
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Kurt S
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click

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Re: Fuel Return lines
« Reply #25 on: June 26, 2011, 02:54:02 PM »
 Ahhh that makes sense Kurt... thanks .
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Click is Jim , central Minn.  Moderator at Team Camaro www.camaros.net
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