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05-04-2009, 07:05 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Fuel line
Instead of hardline which will absorb a lot of heat I would suggest using a Black cloth covered line such as what is available from Earls. It looks good and won't transfer a lot of heat into the fuel.
Rick
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
Last edited by Rick Parker; 05-08-2009 at 09:31 AM..
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05-04-2009, 09:12 PM
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CC Member
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Join Date: Feb 2002
Location: Dadeville,
AL
Cobra Make, Engine: Sold my EM.
Posts: 2,459
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Regarding your plans for the fuel pressure regulator - I recommend a regulator with one input and two outputs (one to the carb and the other back to the fuel tank). They are much easier on the fuel pump. If you do that, you may want the regulator just after the pump so you don't have to run the return line so far.
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Tommy
Cheetah tribute completed 2021 (TommysCars.Weebly.com)
Previously owned EM Cobra
"Never attribute to malice that which is adequately explained by stupidity." - Hanlon's Razor
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05-04-2009, 09:13 PM
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Senior Club Cobra Member
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Join Date: Feb 2005
Cobra Make, Engine: Contemporary, FE, Tremec TKO 600
Posts: 1,987
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Quote:
Originally Posted by Tommy
Regarding your plans for the fuel pressure regulator - I recommend a regulator with one input and two outputs (one to the carb and the other back to the fuel tank). They are much easier on the fuel pump. If you do that, you may want the regulator just after the pump so you don't have to run the return line so far.
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Actually the Mallory 250 GPH pump has a built in return, so I only need to run the return line from the pump back to the tank, and use a deadhead regulator. |
05-04-2009, 10:02 PM
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CC Member
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Join Date: Nov 2000
Location: Tucson,
Az
Cobra Make, Engine: Superformance 427 Side-Oiler
Posts: 2,156
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Quote:
Originally Posted by 767Jockey
Actually the Mallory 250 GPH pump has a built in return, so I only need to run the return line from the pump back to the tank, and use a deadhead regulator.
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That system passes up a great opportunity to cool the fuel,which in any equation is a great thing.
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05-04-2009, 11:03 PM
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Senior Club Cobra Member
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Join Date: Feb 2005
Cobra Make, Engine: Contemporary, FE, Tremec TKO 600
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Quote:
Originally Posted by Cobrabill
That system passes up a great opportunity to cool the fuel,which in any equation is a great thing.
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How does a longer return line equate to cooler fuel? |
05-05-2009, 05:50 AM
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CC Member
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Join Date: Feb 2002
Location: Dadeville,
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Cobra Make, Engine: Sold my EM.
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Sorry about my bogus advice above. I just looked at the Mallory 250GPH pump and your plan looks OK to me. The important thing is that there be a way for excess fuel from the pump to go back to the fuel tank. Some pumps simply reroute the excess fuel back to the intake side of the pump, allowing fuel to recirculate next to the heat of the pump for an extended time. Those types of pumps can lead to to vapor lock.
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Tommy
Cheetah tribute completed 2021 (TommysCars.Weebly.com)
Previously owned EM Cobra
"Never attribute to malice that which is adequately explained by stupidity." - Hanlon's Razor
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05-05-2009, 08:27 AM
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Join Date: Dec 2001
Location: Shasta Lake,
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Cobra Make, Engine:
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Quote:
Originally Posted by 767Jockey
How does a longer return line equate to cooler fuel?
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Just the same as water going through the radiator. The longer it is going through the cooler it will be. A longer return line will have the fuel in it a little longer than a short one which will let some of the heat transfer to the line and the air will cool the line some if it is where air can get to it. That is why I didn't run my fuel lines inside the frame.
Ron |
05-05-2009, 11:09 AM
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Senior Club Cobra Member
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Join Date: Feb 2005
Cobra Make, Engine: Contemporary, FE, Tremec TKO 600
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In theory I understand this. In actuality, I would be shocked to see any measurable difference in fuel temp, and even if you could measure it, the change in HP is probably zero, especially with that "cooler" fuel being dumped into a tank that holds over 40 gallons of ambient temp fuel..
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