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Kirkham Motorsports

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Old 05-07-2009, 11:08 PM
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CobraBill, To be honest I can only hear the pump at idle.
The safety thing ...for me is that no matter what with a mechanical pump when the motor shuts down so does the gas...for sure. Even if I spin the car and lock it up and kill the motor the gas stops pumping. i did race my car a 406 cu and never had fuel starvation with the mechanical pump and believe me I rev the hell out of my motor.
just my 02c
john
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Old 05-07-2009, 11:39 PM
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Quote:
Originally Posted by CHANMADD View Post
CobraBill, To be honest I can only hear the pump at idle.
The safety thing ...for me is that no matter what with a mechanical pump when the motor shuts down so does the gas...for sure. Even if I spin the car and lock it up and kill the motor the gas stops pumping. i did race my car a 406 cu and never had fuel starvation with the mechanical pump and believe me I rev the hell out of my motor.
just my 02c
john
No offense John,but if your 406 wasn't running out of fuel with just a mechanical pump,then it wasn't much of a motor.

A mechanical pump(by itself) will NOT feed my Side-Oiler.

As i posted earlier,every car today has a electric pump.
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Old 05-08-2009, 05:48 AM
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Default The system you have will be fine

767Jockey Doug, the setup you have will be fine. Like others here on the forum a return line will extend the life of your fuel pump or pumps. From racing I can tell you that running an FI system with a return line from the front of the car does raise the fuel temp. Some of the heat comes from the track surface in the daytime, some comes from the resistance of the fuel lines and the pressure pushing the fuel through the system. With the amount of heat under a cobra hood, any line that can help insolate the heat from the fuel would be a help. I think the engineers at wherever added the turkey pan around the carb for a heat insolator because of high fuel temps and vaporlock and to add cooler air from outside the car. Your supply line size is fine. Cooler the gas the less problem of vapor lock you will have. I do open the hood after running to help remove added heat from the engine compartment. I would reccommend this to any one who has gone on a long cruise and stops for 10-15 minutes. This also helps stop the fuel in the carb bowls from boiling and the fuel pressure in the lines from increasing and pushing the floats open. This will cause a washing of the cylinders, black smoke and hard startup. Not good. Rick L.
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