Fuel line & Heat
Thread Starter
Instructor
Joined: Feb 2006
Posts: 117
Likes: 0
From: Elyria Ohio
Fuel line & Heat
On my 1968 BB / 427 , I have been noticing when I get hot , that I sputter. I put a clear bowl filter on the gas up by the fuel into the carb. Then I saw after running for a while that the gas looked like air bubbles in filter. Then I used a IR to check the temps, and down where the fuel line tubing is fastened to the frame near the passenger side exhuast manifold the temp was around 220 degrees. I checked the manifold gasket it is perfect. Engine runs around 195 to 205. Any IDEAS??
Burning Brakes
Joined: Mar 2006
Posts: 915
Likes: 2
From: Lima, OH -- 69 L71 427/435hp
Do what I did, put wooden clothes pins on the fuel line where you can around the block and frame rail...it works. 
And insulating it would help as well, but clothes pins are cheaper.
And insulating it would help as well, but clothes pins are cheaper.
Racer
Joined: Dec 2008
Posts: 297
Likes: 19
From: arlington TX
The problem starts the line location by the exhaust manifold before the (stock) fuel pump, gets more heated by the pump itself, and continues with the steel line running between the pump and the carb - all places where heat is radiated to the line. It is a wonder it even runs sometimes!
Closeness to the heat source(s) is causing the fuel in the line to boil. Some kind of insulation or a shield is needed. (Clothes pins is an OLD trick that sometimes even works.) Wrap the metal line in heat resistant cloth or foil. Even put some rubber fuel hose around the steel line (like a jacket) in the hot area; anything to keep some of the heat away.
Fighting heat in a big block car is an ongoing battle!!
Good luck.
Closeness to the heat source(s) is causing the fuel in the line to boil. Some kind of insulation or a shield is needed. (Clothes pins is an OLD trick that sometimes even works.) Wrap the metal line in heat resistant cloth or foil. Even put some rubber fuel hose around the steel line (like a jacket) in the hot area; anything to keep some of the heat away.
Fighting heat in a big block car is an ongoing battle!!
Good luck.
Burning Brakes
Joined: Mar 2006
Posts: 915
Likes: 2
From: Lima, OH -- 69 L71 427/435hp
You need to keep it cool around the frame rail and as it passes in front of the block leading to the carb.
If the fuel is pretty well evaporated before reaching the carb, it won't matter.
Edit: Or you can put an inline fuel pump after the tank to keep the fuel constant so you have less chance to vapor lock.
Last edited by 1ARACE; Jun 8, 2009 at 05:45 PM.
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Joined: Oct 2007
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From: houston al
Does the 68 have a fuel return line from the filter like the 69's up? This system is used to keep the gas circulating from the tank thru the pump and returning back to the tank, thus keeps cooler fuel running thru the lines. The first thing i would look at is the stock fuel filter. If it is not clear then you do not get enough return flow to keep the lines cool.