C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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Old Jul 1, 2020 | 06:40 PM
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Lars,
Finishing up the fuel system on this 73.
I am thinking just mount the fuel filter where I have it taped up, 90* straight across the front of engine, and 90 * straight into carb.
I cannot tell if the original line went under/ over the heater port, but I feel in the cool air out front is the ticket.

Thoughts?
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Old Jul 1, 2020 | 06:42 PM
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Clarity
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Old Jul 1, 2020 | 10:20 PM
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I'm no Lars...but my gut says you are correct in keeping it in cooler air vs heat sources will be better and more stable.
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Old Jul 1, 2020 | 10:44 PM
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There are lots of ways to plumb this, but as long as your fuel line doesn't contact anything with hot coolant running through it, you're good to go. I admire that you're making your own line and using tube nuts with AN... Im lazy and would have gone all black braid with AN out of the pump to the carb.


Edit... probably the simplest thing here, pending that you aren't running a dropped base air cleaner, would be to run a female to female 90 degree (looks like -6?) connecting your banjo directly to the filter, and then make your flare on the existing line right there for the connection.

Last edited by Big Block Dave; Jul 1, 2020 at 10:50 PM.
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Old Jul 1, 2020 | 10:49 PM
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I could even kick down along the front and go under the stat housing and kick back up.
It would have a goose neck, but that would make an inverted p trap.
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Old Jul 1, 2020 | 10:54 PM
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Originally Posted by Big2Bird
I could even kick down along the front and go under the stat housing and kick back up.
It would have a goose neck, but that would make an inverted p trap.

the banjo gives you the option of pointing the line down that you can get under the upper radiator hose. The world is your oyster. Like I said lots of ways to do this, but yea, ultimately you could go across the front and hide it under the hose and make it work. It would be discreet.
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Old Jul 1, 2020 | 10:58 PM
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Originally Posted by Big Block Dave
the banjo gives you the option of pointing the line down that you can get under the upper radiator hose. The world is your oyster. Like I said lots of ways to do this, but yea, ultimately you could go across the front and hide it under the hose and make it work. It would be discreet.
I am leaning that way. I can clamp it to an unused boss in the front.
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Old Jul 2, 2020 | 03:57 AM
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what does the air filter say? and if you lower the filter down a couple inches, the bend to horizontal will not have to be so tight.
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Old Jul 2, 2020 | 10:05 AM
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I ran my '73 with a similar setup for 10 years without issue. New engine will have the filter mounted on the frame as I'll be feeding the fuel rails from the back.

DC



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Old Jul 2, 2020 | 11:06 AM
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DC3's all solid line setup is super clean and safe. But if you don't want to bend pipe why not just use a braided stainless steel hose with AN fittings? Still super clean, safe AND flexible, like the photo of my Fairlane's fuel line below. And if that is a glass filter canister, I wouldn't. They break too easily.


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Old Jul 2, 2020 | 11:47 AM
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ok, the big loop of steel line. is the air stream from the fans gonna cool the fuel, or heat it as it has already gone thru the radiator?
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Old Jul 2, 2020 | 12:18 PM
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Originally Posted by derekderek
ok, the big loop of steel line. is the air stream from the fans gonna cool the fuel, or heat it as it has already gone thru the radiator?
I would think insulating the fuel line is the best way-

But I doubt in the real world you'd notice a difference- except maybe solving a vapor lock issue-

Then it really doesn't matter where it is in the fan's air stream.....because there's no stream.






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Old Jul 2, 2020 | 01:52 PM
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Done deal. Next ordeal.
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Old Jul 2, 2020 | 01:53 PM
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derek: if your response is directed to my comments, it doesn't make any sense. Maybe I just don't speak cryptic digi-talk too well. I'm old.
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Old Jul 2, 2020 | 01:56 PM
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Never mind, looks like he got it figured out.
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Old Jul 2, 2020 | 02:18 PM
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no, i meant DC3's fuel line which is similar to what Big Bird is gonna have. your braided is a pretty good insulator.
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Old Jul 2, 2020 | 02:28 PM
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Originally Posted by derekderek
ok, the big loop of steel line. is the air stream from the fans gonna cool the fuel, or heat it as it has already gone thru the radiator?

Didn't appear to matter in my case. Never had an issue of any kind due to the way I plumbed the filter/fuel line over the 10 years or so I ran it that way.

DC
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Old Jul 2, 2020 | 03:19 PM
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My version of the fuel delivery to the carb. Granted, different carb, and a bunch more cubic inches.


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Old Jul 2, 2020 | 05:32 PM
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Originally Posted by DC3
I ran my '73 with a similar setup for 10 years without issue. New engine will have the filter mounted on the frame as I'll be feeding the fuel rails from the back.

DC


That filter caught my eye. Is that an adapter at the outlet? It looks like you've solved a problem that has puzzled me for a while. Thanks.
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Old Jul 2, 2020 | 05:54 PM
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That filter look s like the one on my 03 GMC to the
fuel rail 37* fittings x2
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