Author Topic: ZL1 fuel pump  (Read 7639 times)

blackss69

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ZL1 fuel pump
« on: October 06, 2015, 02:24:57 PM »
I have questions on the ZL1 fuel pump and fuel lines.   It all started with my 40170 fuel pump that I put on the car in 1969.

First it appears that 40731 fuel pump and a matching fuel line was called out in the Add/Delete/Replace section of the ZL1 engineering data.  The 40731 moves the fuel inlet and outlet locations clockwise compared to my 40170.  This would definitely require a new fuel line.   

My 40170 fuel pump can be installed without a new fuel line.  Early vintage pictures show the fuel line near the fuel block looking like a normal L78 fuel line.   

Does anyone know if the 40170 fuel pump was actually used in the production line ZL1?

Does anyone have actual vintage pictures of the installed fuel pump and fuel lines.  I am especially interested in the inlet rubber hose, the inlet connector 90 degree elbow and the outlet fuel line on the 40731 fuel pump.

I assume the 40170 fuel pump could be disassembled and the bowl rotated.  Has anyone done this?

WOW   Here are a lot of quesions.    Thanks

blackss69

william

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Re: ZL1 fuel pump
« Reply #1 on: October 06, 2015, 02:46:34 PM »
I was involved with a ZL1 resto a few years back. The fuel pump and lines were a struggle.

Far as I know they did use the rebuildable pump; I have a poor pic of an original. It must have been furnished to production with an inlet nipple as the bowl only has fittings. You can 're-clock' the bowl if need be. I don't believe the L72/78 fuel line will work. The biggest obstacle is getting all this to fit with the AIR pump bracket in the way; really makes it difficult.

The August '69 HP Cars has a good engine photo of #3 which shows the routing of the line.

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blackss69

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Re: ZL1 fuel pump
« Reply #2 on: October 06, 2015, 07:37:11 PM »
William

Thanks for the comments.  I have HP Cars Aug 69 and have looked at the pictures.  The "whole" engine shot is for a Corvette (probably publicitiy photo).  It shows a sealed fuel pump and not the screw together rebuildable one like 40170 or 40731 

The #3 Camaro engine shot looks like a L78 fuel line at the top end of the fuel line before the fuel block.  I have a Right Stuff Detailing FPC69ZL fuel line that is supposed to be for a ZL1 Camaro.  It is different at the top end of the line and looks like it would work with the "rotated" 40731 fuel pump at the outlet if a 45 degree connector was used between the fuel pump and the fuel line. 

The Cars shot makes me really wonder if the L78 line would work with a 40170 if slightly bent at the fuel pump end.   That is what really makes me think that a 40170 was used on the ZL1 Camaro instead of the 40731 (at least in early cars).

Confusing Yes

 

william

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Re: ZL1 fuel pump
« Reply #3 on: October 06, 2015, 09:27:38 PM »
What is the difference between the two pumps?

The line to the carb on our build does not have an additional connector. There was only one bowl position that worked, at least for us. The Right Stuff line appears to be configured for an LS6.
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blackss69

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Re: ZL1 fuel pump
« Reply #4 on: October 07, 2015, 01:10:23 AM »
As far as I can tell the only difference between 40170 and 40731 is the indexing of the fuel pump bowl.   

The 40170 fuel pump (found in HD Parts catalog) has the inlet and outlet positions in approximately the same locations as a standard L78 fuel pump.  It is rebuildable, etc like the 40731.

The 40731 has the bowl rotated so the inlet and outlet positions are shifted clockwise approximately 90 degrees.  This would require a special fuel line for the output and a 90 degree connector for the inlet side.  The 90 degree inlet connector is called out in the Engineering Specs on the ZL1 assembly differences.  There is no outlet connector called out but one has to be used since the fuel pump fittings are 1/4 Male Pipe Thread.  I think the outlet connector would be 45 degrees connecting to the 3/8 metal fuel line.

If it would help I can post a picture of my 40170.  The 40731 pictures I found are from rebuilt units from the Camaro parts vendors. 

I hope this makes sense. 

william

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Re: ZL1 fuel pump
« Reply #5 on: October 07, 2015, 02:14:44 AM »
The inlet was easy to hook up w/o a 90º connector but could be that would have made the fuel line easier. I will have to have a look at that next time I work on it. We used the AIR pump bracket GMPD sold in the late '80s; maybe the OE bracket was different. It is so tight the fittings nearly come in contact with it.
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z28z11

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Re: ZL1 fuel pump
« Reply #6 on: October 07, 2015, 03:09:44 AM »
Take a gander at this one - I've been trying to identify it for a bit. This may be an LS6 version, but any clues would be greatly appreciated -

Regards,
Steve
1968 Z28 M21/U17 BRG/W 1967 Chevy ll Nova SS 
1969 Z28 X77/M20/VE3 LeMans/W
1969 L78 X66/N66 Cortez/BVT
1969 Z11 L48/M35/C60/C06  1949 3100 5wd 235/6

ko-lek-tor

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Re: ZL1 fuel pump
« Reply #7 on: October 07, 2015, 03:34:23 AM »
Steve, I believe that is an over the counter Hi-Perf pump sold as such by Carter. I think I have a new one (BB) somewhere that I bought when I worked at a speed shop back in 79-80. I guess more digging and more pics coming...
Bentley to friends :1969 SS/RS 396 owned 79
1969 SS 350 (sold)
1969 D.H.COPO replica 4spd. owned since 85
1967 302 4 spd 5.13

z28z11

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Re: ZL1 fuel pump
« Reply #8 on: October 07, 2015, 03:45:47 AM »
On my LS5 when I bought it, knew it was incorrect so I pulled it and replaced with the correct "deep" pump with two vent lines. Took a while to find that one, too -

Carter manufactured fuel pumps right up the road from me in Tennessee (Lafayette, Macon County)  -actually was one of my customers. The mold storage in die cast had many AC molds in storage - either they private branded them, or had assumed the molds from Delco. Plant closed years ago - hate it. Never knew what happened to the dies (pressure die cast) - sold or scrapped.

Regards,
Steve
1968 Z28 M21/U17 BRG/W 1967 Chevy ll Nova SS 
1969 Z28 X77/M20/VE3 LeMans/W
1969 L78 X66/N66 Cortez/BVT
1969 Z11 L48/M35/C60/C06  1949 3100 5wd 235/6

blackss69

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Re: ZL1 fuel pump
« Reply #9 on: October 07, 2015, 01:43:35 PM »
Here are pictures of my used 40170 fuel pump (purchased in late 60's).  The 45 degree connector on the outlet side was for a fuel line I made years ago and is not correct (no AIR pump was used then). 

Thanks

blackss69

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Re: ZL1 fuel pump
« Reply #10 on: October 07, 2015, 01:45:17 PM »
Other picture.   Darn computers.

ko-lek-tor

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Re: ZL1 fuel pump
« Reply #11 on: October 07, 2015, 06:03:03 PM »
Steve, I believe that is an over the counter Hi-Perf pump sold as such by Carter. I think I have a new one (BB) somewhere that I bought when I worked at a speed shop back in 79-80. I guess more digging and more pics coming...

Please, not h-jacking this post, just FYI RE: Steve & Carter pump
Carter  on LH is #4891 SB on edge where GM # found http://www.summitracing.com/parts/crt-m4891
GM is a 4657 on RH.
Bentley to friends :1969 SS/RS 396 owned 79
1969 SS 350 (sold)
1969 D.H.COPO replica 4spd. owned since 85
1967 302 4 spd 5.13

 

anything