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68 pump to carb

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Old Dec 25, 2024 | 09:02 AM
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Default 68 pump to carb

Bringing a 68 back to life. What am I missing, the filter bracket is supposed to fasten to the front of the block. The line seems to be bent the wrong way. Every set I've looked at from all the different suppliers is the same. 68, 327.
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Old Dec 25, 2024 | 09:17 AM
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My '68 L36 BB also has a similar can but with an additional small diameter return feed back to the tank - filter itself seems to be an unavailable part now and I have adapted a Jeep 3 line canister fuel filter to suit. Mine is mounted lower and much closer to the engine block.......tbh I'm not too sure if a bracket to secure the filter was ever used.......the 'hard; pipework connected seem quite adequate,
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Old Dec 25, 2024 | 09:43 AM
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Where did you get your fuel line from or did you fabricate it?
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Old Dec 25, 2024 | 12:29 PM
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Originally Posted by bg725
Bringing a 68 back to life. What am I missing, the filter bracket is supposed to fasten to the front of the block. The line seems to be bent the wrong way. Every set I've looked at from all the different suppliers is the same. 68, 327.
The bracket was designed for the original lines and fuel filter and carburetor. Cannot tell from the picture what fuel pump you have. You have a Holley, should be a Quadrajet, the filter should have a nipple for the return line. See the stock picture in the link.
https://www.zip-corvette.com/68-69-3...-line-kit.html
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Old Dec 25, 2024 | 12:47 PM
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As stated above, both 68 small blocks used a cast iron intake and a Quadrajet carb. The original filter has a return line and the carb also had a filter in the inlet. If you are going to keep the Holley and aluminum manifold, give a look at the 70 plus LT-1 set up. You may be able to piece something together. Jerry
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Old Dec 26, 2024 | 11:42 AM
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Originally Posted by bg725
Bringing a 68 back to life. What am I missing, the filter bracket is supposed to fasten to the front of the block. The line seems to be bent the wrong way. Every set I've looked at from all the different suppliers is the same. 68, 327.

I’m not sure where the bracket is attached in this photo.

Here’s a different photo showing a bracket attached to the head.


From photos Ive seen, I think the bracket you are asking about would have fastened to the air injection pump. I had the same dilemma. I made my own carb inlet line like you. I made a bracket with a factory appearing slant. I used the intake attachment stud for the “65” fuel filter bracket with some pieces/parts I had. I painted the filter for presentation like a GF-90. My heads have no accessory holes.






Last edited by Chagjr; Dec 26, 2024 at 10:17 PM.
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Old Dec 26, 2024 | 05:32 PM
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Originally Posted by bg725
Bringing a 68 back to life. What am I missing, the filter bracket is supposed to fasten to the front of the block. The line seems to be bent the wrong way. Every set I've looked at from all the different suppliers is the same. 68, 327.
No, the filter bracket does not attach to the front of the block. You're trying to mix-and-match custom aftermarket parts with stock factory parts and expect things to fit and line up. It won't work that way. The stock filter and line system was used with the Q-Jet carb and an A.I.R. pump. You have swapped over to an aftermarket Holley carb, which requires a completely different, custom made fuel line. The stock line used a fuel filter with a return line (which you do not have, but you need it). That filter was attached to the A.I.R. pump bracket with the lower pump bracket bolt. You do not have an A.I.R pump installed, and you don't have the pump bracket, so you can't use the stock filter attach bracket. If you're going to build a custom, non-stock setup, you have to custom build your own fuel lines and bracket.

The stock system, looks like this - you can see how the filter has the return line, and how the filter bracket attaches to the A.I.R. pump bracket bolt.




Here you can see the '68 system installed without the A.I.R. pump, so it hangs out in the middle of nowhere with no bracket support - not the best idea, but at least the correct filter is installed with the return fuel line:


Here is a home-made bracket system that has been installed in place of the A.I.R. pump bracket to secure the filter. Not the cleanest approach, but it works. The correct filter bracket is clearly visible:

Last edited by lars; Dec 26, 2024 at 11:35 PM.
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Old Dec 26, 2024 | 08:10 PM
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Wrong intake and carb. You need to use a 70-72 LT1 dual feed line setup. Your carb may be a single, not sure but it's the wrong carb. The whole setup you have will look factory if you use the LT1 line setup.
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Old Dec 26, 2024 | 11:29 PM
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It will never look "factory" with the parts he has. There were no LT1s in '68. The OP needs to decide if he's "bringing a '68 back to life" or of he's building a custom street rod. From the parts he has selected, it appears he wants to build a custom street setup, but if that's the case, he needs to abandon the idea of using stock '68 fuel line parts, intended for an L79 with a Q-Jet carb, and stop wondering why they don't fit...

But, yes, you're right - he can make it work if he uses the 1970 350 LT1 fuel line system for the 1970 factory Holley carb. This line, however, does not have an in-line filter, so he has to make sure he has in-carb filters installed on both primary and secondary sides as the LT1 carb did. It also does not have the provision to use a return fuel line, which his car needs if he's going to run it on the street using pump gas in Ohio in the summer. This will not in any way look "factory" for a '68 Vette, and the deleted fuel return line is going to cause vapor lock issues on hot days.

Lars

Last edited by lars; Dec 26, 2024 at 11:45 PM.
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Old Dec 27, 2024 | 07:43 PM
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Originally Posted by lars
It will never look "factory" with the parts he has. There were no LT1s in '68. The OP needs to decide if he's "bringing a '68 back to life" or of he's building a custom street rod. From the parts he has selected, it appears he wants to build a custom street setup, but if that's the case, he needs to abandon the idea of using stock '68 fuel line parts, intended for an L79 with a Q-Jet carb, and stop wondering why they don't fit...

But, yes, you're right - he can make it work if he uses the 1970 350 LT1 fuel line system for the 1970 factory Holley carb. This line, however, does not have an in-line filter, so he has to make sure he has in-carb filters installed on both primary and secondary sides as the LT1 carb did. It also does not have the provision to use a return fuel line, which his car needs if he's going to run it on the street using pump gas in Ohio in the summer. This will not in any way look "factory" for a '68 Vette, and the deleted fuel return line is going to cause vapor lock issues on hot days.

Lars
I didn't say that in belief he would pass it off as a LT1. All I meant was a factory line would give the OE appearance using the intake and carb he was using. He has many wrong parts for a correct 68. He most surely can make that engine mimic a LT1 and most people who will look at it in a parking lot will not know it is a wrong engine setup for a 68 all together. Most of the new Holley's have the provision for the brass filters, but I do not believe the come with them and didn't even think about that one. He is going to have to block off that return on the frame though and can seal it up on the tank as well. If it were my car at this point with a 350 in it, that is the route I would go. Heck I had a 75 with a 70 LT1 engine and most people had no idea that it wasn't supposed to be there.
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Old Dec 29, 2024 | 02:43 PM
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What I'm building is a reliable daily driver, don't care about looking factory. This is what I came up with.
I have hood clearance and the air cleaner sits as it should.
I have hood clearance and the air cleaner sits as it should.
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Old Dec 29, 2024 | 02:51 PM
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I found the original cast intake, it weighs a ton, free to good home if anyone is looking for factory. This is a numbers matching car so anyone going the NCRS route might want it.
Thanks for all the advice, the forum is still the greatest.
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Old Dec 29, 2024 | 02:55 PM
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Well you would have to change your carb for the LT1 line, that is a pass side dual feed for a Holley with dual metering blocks. The Holley you are using is similar to a 66-67 Holley on a sbc 300/350HP. You would still have to add the rubber line but if you look at pics you will see that is stays nice and close to the block. If your line is clearing the air cleaner fine though, just leave it as it is.
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Old Dec 29, 2024 | 03:05 PM
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If you just want it to look good, be "stock-like," and be reliable, you can use the 1965 fuel line intended for the single-inlet Holley used on the 327 L79. It looks like this. The '65 filter does not incorporate a return fuel line, however. It would just take a fitting change on the fuel lines and some minor tube fab work to use the '68 filter with return by laying the filter on its side like the '65 system as shown below. It would look a lot cleaner than the ill-fitting system you currently have pieced together:











Lars

Last edited by lars; Dec 29, 2024 at 03:12 PM.
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Old Dec 29, 2024 | 03:20 PM
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I know exactly what the 65 setup is, I had a 65 L76 for the past 11 years, just sold it. Take a look at allsport dealer in Pittsburgh. Check out the website, chose view all inventory. The 65 they have for sale was mine, I did all the work, they pulled it apart and painted it.
back to the 68, ill fitting as it is, im leaving it alone. Moving on to other issues, wiper door is stuck open. Probably need a new door actuator, tried to pull a vacuum on it, no dice.
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