Electric fuel pump

Henry I think your example is a little off the deep end to say the least, but nothing wrong with an inertia switch, they are also a good idea. And yes, modern cars have these systems with the electrical fuel pumps. An electric fuel pump can be very dangerous in a crash without a cut off system of some type.
 
If you have an electric fuel with 4 lbs max pressure rating you don't need a pressure regulator. That's what the .097 hole in the needle valve is for to regulate the flow with 2 to 4 lbs fuel pressure. Much above 4 lbs and the carb could flood an much below 1 1/2 lbs it will starved for fuel at high speeds. Ford tried a .112 hole then a .105 and settled finally on a .97 0r .98 hole. I do suggest a spring loaded switch. G.M.
 
Old Henry said:
Regarding relying on an oil pressure cut off switch: Suppose you are cruising along the lonely two lane using the throttle knob for cruise control (as I do all the time) when a front tire blows, you lose control, the car rolls multiple times knocking you unconscious, and lands on its wheels out in the wilderness. The engine would still be running full speed in gear with the throttle pulled out including plenty of oil pressure to keep it going.

See the problem with oil pressure cut offs?
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I would never use the throttle knob for cruise control personally, but even if I did, are you certain this scenario would trigger the inertia switch? I'm not.
 
coolcoupe said:
How far away from the gas tank can you mount (in feet) the electric pump ?
Thanks for any help
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Electric fuel pumps work best the closer to the fuel tank they are and the lower they are. They can be mounted any distance from the tank (within reason) that you want as long as you keep it low compared to the fuel tank.
 
Heard said:
I would never use the throttle knob for cruise control personally, but even if I did, are you certain this scenario would trigger the inertia switch? I'm not.
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It's the same switch that all modern vehicles count on to cut off the engine in a collision. I am way more certain about the inertia switch than that an oil pressure shut off switch would do the job. An oil pressure switch only cuts off the power once the engine dies. That doesn't solve the problem in a collision. Just to be sure one could install both style cut off switches.
 
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That's the way modern cars are set up, both. The engine running is not always oil pressure, but computer controlled.
 
You will need that fuel pressure regulator...2-2 1/2# is plenty of pressure.
I went elec. and removed the mechanical pump. Guess I could break down, that's why I've also got AAA.
My family and I broke down near Quinter Kansas back in the 90's and the delay caused us to miss a tornado a few miles ahead. We never know!
 
Bill S said:
When cutting the fuel line to install the electric fuel pump did you drain the fuel tank.
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That would probably be the better way but I couldn't get the plug out of the tank. So, I just started cutting into the fuel line with a tubing cutter that rolls around the tube just until a small crack in the tubing then let it all drain into a container at that point before cutting any further. Now that I have the electric pump, if I need to empty the tank, like to replace the fuel filter on the pump, I can just disconnect the fuel line to the mechanical pump, put a hose on it to a container, turn the electric pump on and pump all of the gas out that way.
 
Thank you. I want to either remove or bypass my 40 ford mechanical fuel pump. I have the oil pressure kill switch and the momentary toggle switch to start the car. I have a 12volt Carter electric fuel pump and the low pressure regulator. Only question does the Carter electric fuel pump last and is it reliable?
 
Thank you. I want to either remove or bypass my 40 ford mechanical fuel pump. I have the oil pressure kill switch and the momentary toggle switch to start the car. I have a 12volt Carter electric fuel pump and the low pressure regulator. Only question does the Carter electric fuel pump last and is it reliable?
 
Is there a gas line shut off valve that could be installed so that you do not have to drain the gas tank if installed after the tank and before the filter, pump and regulator?
 
4t8v8 said:
Installed inexpensive electronic pumps from Auto Zone on both my vehicles close to the tank and removed the mechanical. Used a common oil pressure switch for safety reasons so if the engine dies so does the pump. Put a momentary contact switch in the system so if it sits too long I can fill the carb before I start it. Been on both vehicles for over 25 years and not one problem.
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Gentlemen, based on the comments made I will remove the mechanical fuel pump from my 1940 Ford and install a Carter electric 12 volt fuel pump with a pressure regular at 2.5 with an oil pressure kill switch and a momentary toggle switch to jump out the oil pressure kill switch to prime the carb. Thanks and if it lasts for over 25 years it will be last longer than me.
 
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