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How to change 1984 chrysler new yorker 2.6l from an electric fuel pump to a mechanical fuel pump.

I just found out that my car has an electric fuel pump still installed but it runs to the fuel filter then to the mechanical fuel pump then to another fuel filter before finally going into the carburetor. I think at one time someone changed this car from an electric fuel pump to a mechanical fuel pump but didn't do it right so it has been running off the electric fuel pump til it finally broke down and wont pump fuel anymore. Is there a way to just do away with the electric fuel pump since there is already a mechanical pump in the motor? Maybe run the fuel line instead of through the first filter just running the fuel line straight to the mechanical fuel pump? Will this make the electric fuel pump void and just allow the mechanical pump to pump the fuel?

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  • Cars & Trucks Master
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Replace the mechanical pump with a new unit and that will remove any reason of broken/failure from the equation. Remove the electric pump altogether and leave 1 filter in the line before the mechanical pump. Mechanical pumps are not in favour with some people who have no idea that they can be adjusted to give more pressure and greater volume for the bigger capacity engines. Some mechanical pumps are more expensive to repair / replace but if you price an electric pump to supply the volume that a properly adjusted or a larger capacity mechanical pump then the cost saving is minimal. Unless you get a fuel filter that is rated with a smaller micron rating than the standard filter any number of filters will not work as the smallest particle will get through the lot

Posted on Nov 21, 2013

Testimonial: "so does this mean I can just run the fuel line to the fuel pump and then the mechanical fuel pump to the filter then to the carb? I don't see the point in the fuel filter that is placed before the mechanical pump, since there is a filter after the pump. I just want to hook up the fuel line to the mechanical pump and unplug the electrical pump to see if it will pump the gas through to the carb. This shouldn't hurt anything right? Do you think it would work without unplugging the electric pump since the electric pump is bad and doesn't work anyways? Use the old electric pump as a stopper for the hole that would be there if I took it out. I just want to know if I can try this without severely messing up my car."

  • 3 more comments 
  • Chris Ferbert
    Chris Ferbert Nov 21, 2013

    What do I put in place of the hole where the electric fuel pump is mounted on the back of the gas tank if I remove it completely? Can I just unhook the power plug from the electric pump, because there is already a brand new mechanical pump installed in the car? Why does the fuel run through the filter before it runs into the fuel pump? Shouldn't it be running through a filter before entering the carb instead?

  • Bill Boyd Nov 21, 2013

    mechanical pumps have two valves in side and you want clean fuel before the pump or any material can get top the pump and hold either or both valves open making the pump inoperative. If you can suck through the electric pump ok then disconnect the plug and leave it go.

  • Chris Ferbert
    Chris Ferbert Nov 21, 2013

    Do what through the electric pump? lol

  • Chris Ferbert
    Chris Ferbert Nov 21, 2013

    so does this mean I can just run the fuel line to the fuel pump and then the mechanical fuel pump to the filter then to the carb? I don't see the point in the fuel filter that is placed before the mechanical pump, since there is a filter after the pump. I just want to hook up the fuel line to the mechanical pump and unplug the electrical pump to see if it will pump the gas through to the carb. This shouldn't hurt anything right? Do you think it would work without unplugging the electric pump since the electric pump is bad and doesn't work anyways? Use the old electric pump as a stopper for the hole that would be there if I took it out. I just want to know if I can try this without severely messing up my car.

  • Bill Boyd Nov 22, 2013

    I have stated the reason to have the filter before the mechanical pump. That is standard position of all mechanical pumps. The filter after the mechanical pump is sometimes used to prevent vapour lock in the fuel line but unless you have that problem it is up to you if you want to rempve it

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