Gas Line

[Dan D.]

The gas line from the tank on my 57 (VIN 4122) is routed on the inside of the frame rail.

The Paragon catalog shows it on the outside of the frame rail.

On my car, with the inside rail, the line is only about 1 inch away from the exhaust manifold. This is where it connects to the flex hose, and I get vapor lock all the while (pure gas only). I don't remember how it was routed when I took it apart - too many year ago.

The lines and tank are all new aftermarket. Also, do you see a lot of gas gauge fluctuation with an un-baffled tank, such as I have? And it is difficult to get the tank full because the filler connection is located on the side of the tank - not above it.

Its just that back in the day I drove my 54 for 10 years, and this car for 3 years, and I just don't remember any of this. Don't get old, I guess.

Anyhow, does anybody have any experience with this?

Dannnnnnnn

[Gary C.]

Re: Gas Line

Dan,

AIM Section 5 Sheets 1.0, 3.0 & 4.0 illustrations shows fuel and brake lines run inside of frame rails.

Gary
....

[Dan D.]

Re: Gas Line

Thanks Gary,

Yes, I did look at these sheets, but they are primarily for the brake lines. Sheets 3 & 4 do show the fuel line, and it is exactly how I installed mine. But it does not show how it terminates at the fuel pump, which is my real question. A photo looking down the right side of the engine compartment would be most beneficial. I can't believe that the gas line should be that close to the manifold.

I think the line was moved to the outside of the frame at some point, most likely to improve the perk problems such as I am seeing. I don't know when, and possibly the Paragon drawing is not that entirely accurate. These cars saw many design changes back in that time frame.

Does anyone have any thoughts about the other observations and questions I posted?

Dannn

[Gary C.]

Re: Gas Line

Dan,

Photo of my '57 FI RH exhaust and fuel line. Hope this helps.

Gary
....
Engine RH Exahust Manifold.jpg FI Exhaust Spacer on car v1.jpg Front Suspension RH.jpg

[Mark E.]

Re: Gas Line

Is the pump clocked properly, and is the proper inlet fitting used? A photo would be helpful.
See https://www.corvetteforum.com/forums...of-outlet.html

[Dan D.]

Re: Gas Line

Hi Gary,

Your photo's help, and they don't help too! First off, mighty fine looking 57 you have there. I am jealous. Looks like you are well along with a frame-off restoration. Your photo's are very good.

Looks like your set-up is just about identical to mine. They don't help because your fuel line is even closer to the manifold than mine is!!! I was hoping you would let me see the error of my ways.

I have my fuel line routed under the brake line at the 'T'. Yours is on the top, which is probably correct, mine is not in this regard. But either way that is not going to make any difference. My car is a driver, so I think I am going to mod it to get more clearance here.

The close proximity is where the fuel line meets the hose, so the line has to be modified to move it away some.

Mark, thanks, I have an 083 pump and I re-clocked it to make it more 'correct' for my car, and to get the outlet port in the correct position to climb up the front of the engine to the fuel filter, and then the fuel meter on my FI unit. It is clocked just like Gary's is. I have a 90* fitting, probably should be a 45, as you say.

The 61 in the link from CF is way different, but a much better set-up as the fuel line is on the outside bottom of the frame. I can't see the inlet fitting on his, but it looks like the hose is on the bottom and heading toward the engine.

I will post a photo of mine latter today. We shall overcome.

Dannnnnn

[Gary C.]

Re: Gas Line

Dan,

Thanks. Those photos were taken many moons ago.

Attached is a photo of Dave Smith's unrestored '57 Duntov car's fuel line to flex line.

Gary
....

DSC00709.jpg

[Rod K.]

Re: Gas Line

I'm no expert on this subject or any other, but if I'm not mistaken, I think the fuel line went to the outside of the frame rail in '58. Maybe someone with a '58 AIM can check.

[Dan D.]

Re: Gas Line

Hi Gary,

Your photo's help, and they don't help too! First off, mighty fine looking 57 you have there. I am jealous. Looks like you are well along with a frame-off restoration. Your photo's are very good.

Looks like your set-up is just about identical to mine. They don't help because your fuel line is even closer to the manifold than mine is!!! I was hoping you would let me see the error of my ways.

I have my fuel line routed under the brake line at the 'T'. Yours is on the top, which is probably correct, mine is not in this regard. But either way that is not going to make any difference. My car is a driver, so I think I am going to mod it to get more clearance here.

The close proximity is where the fuel line meets the hose, so the line has to be modified to move it away some.

Mark, thanks, I have an 083 pump and I re-clocked it to make it more 'correct' for my car, and to get the outlet port in the correct position to climb up the front of the engine to the fuel filter, and then the fuel meter on my FI unit. It is clocked just like Gary's is. I have a 90* fitting, probably should be a 45, as you say.

The 61 in the link from CF is way different, but a much better set-up as the fuel line is on the outside bottom of the frame. I can't see the inlet fitting on his, but it looks like the hose is on the bottom and heading toward the engine.

I will post a photo of mine latter today. We shall overcome.

Dannnnnn

Enclosed pic of my setup. Rod just said he thought the outside frame rail started ion 1958. He could be right.


Gas Line Routing.jpg

Dannn

[Jim L.]

Re: Gas Line

I'm no expert on this subject or any other, but if I'm not mistaken, I think the fuel line went to the outside of the frame rail in '58. Maybe someone with a '58 AIM can check.

It strikes me as odd that the lines would be on the inside of the frame rails on Corvettes. Why? Because Chebby passenger cars of that era located the brake and fuel lines on the outside of the rail WHEN THE CARS CAME WITH DUAL EXHAUST. So, clearly, Chevrolet was aware of the wisdom of keeping fuel away from exhaust heat. So why didn't they do the same for Corvettes? (Rhetorical question.)

[Dan D.]

Re: Gas Line

It strikes me as odd that the lines would be on the inside of the frame rails on Corvettes. Why? Because Chebby passenger cars of that era located the brake and fuel lines on the outside of the rail WHEN THE CARS CAME WITH DUAL EXHAUST. So, clearly, Chevrolet was aware of the wisdom of keeping fuel away from exhaust heat. So why didn't they do the same for Corvettes? (Rhetorical question.)

Well Jim, for one thing, it probably was a different design team. Or it might be in the same boat as port vacuum advance on 1963 FI units. Just no explanation for it.

One more - Corvette mufflers are located on an angle in front of the differential and away some from the brake & fuel lines, pass cars are on the under belly closer to the lines. The major problem with cars was floor board heat.

But the issue here is not muffler heat, it is that the line terminus (and flex hose) is 1 inch away from the exhaust manifold exit flange. Not good, especially if running ethanol laced fuel, which I am not. $4.09 2 weeks ago in upstate NY - for 90 PON.

Dannn

[Richard M.]

Re: Gas Line

Dan you might want to consider using a heat wrap tube over the area of concern. They make it with a velcro strip so you don't have to thread it over the pipe. This way you can remove it if needed for judging etc.

EG Here

heatwrap1.jpg heatwrap2.jpg

Others HERE


Rich

[Dan D.]

Re: Gas Line

Thanks Rich,

I'll look into this.

Dann