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Fuel tank design

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Paul New:

--- Quote from: dreracecar on October 30, 2015, 10:04:56 AM ---Ditto on the front to back vent tube. it works the best both in accel and decel.
Absolutly no reason to run that big of a fuel line and with the tank so far foward and the tank not being tall (for head pressure) 1"od tube is more than enough volume.
 Pumps push fuel and really dont like to suck and is easy to break vacuum under a hard decell if there are any air pockets in the tank. The bigger the line causes the extra fuel weight to move forward because its not a tall tank with 5 gallons of fuel pushing down on the outlet keeping the line filled.

--- End quote ---

Never thought that a 1" line was big enough to feed a 110 due to the size of fittings they sale for them, that is why I went with a 1.25 line thanks for the input

dreracecar:
Gone 6.80's with a 1"od to the inlet of a 110 pump that feeds a -8 to the BV.
Fuel pulls faster from the center of the tube line than the fuel thats rubbing the ID of the tube. The smaller the od of the tube the larger the center fuel core there is, the larger the od the smaller the core is. This is matched to pump size and head pressure/ line length. If this was a funnycar/altered and the tank was tall and back towards the pump, 1 1/4 would work because the head pressure of the fuel is above the pump inlet and thats what is feeding the pump, but since you are much further away and the head pressure is below the pump inlet, you need a stronger draw from the tank(larger center fuel core)

Paul New:
Good information what size of fuel line does an A/fuel car require not that I run those E.T.'s now but who knows

ricardo1967:

--- Quote from: dreracecar on November 01, 2015, 12:44:42 PM ---Gone 6.80's with a 1"od to the inlet of a 110 pump that feeds a -8 to the BV.
Fuel pulls faster from the center of the tube line than the fuel thats rubbing the ID of the tube. The smaller the od of the tube the larger the center fuel core there is, the larger the od the smaller the core is. This is matched to pump size and head pressure/ line length. If this was a funnycar/altered and the tank was tall and back towards the pump, 1 1/4 would work because the head pressure of the fuel is above the pump inlet and thats what is feeding the pump, but since you are much further away and the head pressure is below the pump inlet, you need a stronger draw from the tank(larger center fuel core)

--- End quote ---

Humm, well, not sure if I’m reading your words right Bruce… the restriction for a fluid to flow in a pipe is proportional to the velocity of the fluid (just like aero drag in a car). The fluid molecules touching the pipe have zero speed and the molecules in the center of the pipe have maximum speed. Larger pipe diameters results into proportionally lower speeds, therefore if flows easier. Now, the law of diminishing returns applies here, so there will be no practical gains using a 2” fuel inlet pipe where the 1” meets the restriction criteria.

Paul New:
Started the tank project this weekend bent the top, sides, and front






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