Fuel pump placement


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By charliemccraney - 13 Years Ago
I need to move the fuel pump now that I've lowered the rear. It's not much higher from the ground than some curbs. The simple thing to do is to move it closer to the axle which will take it farther out of harms way but I'd rather get it up so that it is simply not the lowest point. If I raise it, the fuel inlet will be higher than the bottom of the tank and if I retain the current feed configuration when I "run out" of fuel, there might be a gallon or two still in the tank. Cohesion may keep it flowing until I shut it down. Then I'm sol.

I can make a tube that I can mount to the top of the tank to create a siphon. I know that when gravity is all that is involved, the outlet of the tube needs to be lower than the bottom of the reservoir from which the fluid is being drawn in order to completely drain that reservoir. Can a pump change this requirement? And if so, do you think the minimal fuel requirements at low engine speeds will be sufficient to keep the fuel flowing?



Another alternative is to fit an in tank pump.



Or maybe a check valve is all I need but that might cause problems upstream on warmer days.



Maybe a simple bend up and then back down (an upside down U) before going to the inlet can trap enough fuel to get things flowing after a shut down and avoid issues a check valve might introduce.



You know, this last one will be easy to set up and test with some rubber hose and something to create a restriction to simulate idle flow and if it works it will be a simple implementation. On second thought, that will probably siphon the fuel out of the linebetween the pump and engine because the fuel in the lines at the engine will drain back when the pump is turned off This may also happen with a siphon going in at the top of the tank because the carburetor is higher than the tank.
By pegleg - 13 Years Ago
Charlie, check valve?
By Pete 55Tbird - 13 Years Ago
Charlie

I do not get the issue. Is your system a low pressure pump ( not a FI ) ? If it is, why not just relocate the pump higher and continue to use the existing in tank pickup tube. Why would you need an anti-syphon device or a check-ball.

On the English cars of the 60`s, the SU electric pumps are very low pressure ( 1 1/2 to 4 PSI ) and they are located ABOVE the gas tank.

Help me understand your concern. Pete

By charliemccraney - 13 Years Ago
My concern is that raising the pump will result in less useable tank capacity because it won't be able to pull the fuel out.



I found the instructions for the pump. "Place the pump and bracket assembly as near to the bottom of the fuel tank as possible, but never more than 24 inches above the top of the tank."



On the carter website, "Originally created for military use, this design has been in production longer than any other Carter model. Rotating vanes driven by a heavy-duty wet motor deliver pressure from 4 to 18 psi at a flow rate of up to 100 gallons per hour. This provides excellent lift and prime capability."



I think it will be alright to raise it a few inches. It pays to read the instructions.Hehe
By LordMrFord - 13 Years Ago
I had Carter in high place under the hood and it worked quite well.

In nowdays Carter is in front of fuel tank and high pressure pump delivers fuel after reservoir cell.
By charliemccraney - 13 Years Ago
Done.



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