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Technical 48 Cad Coupe Flattie

Discussion in 'Traditional Customs' started by 54caddycoupe, Jun 12, 2020.

  1. 54caddycoupe
    Joined: Oct 11, 2011
    Posts: 23

    54caddycoupe
    Member

    I am eliminating the stock fuel / vacuum pump on the 346 Flattie but want to run the stock Carter carb. What PSI range should I be shopping for in the Electric fuel pump. The car is currently a 6 Volt system. I have seen some 6V pumps on the summit site but I am not sure what PSI to shop for.
     
  2. 54caddycoupe
    Joined: Oct 11, 2011
    Posts: 23

    54caddycoupe
    Member

    I found in the service manual that the fuel pump is designed to deliver 3.5 to 5 psi .. I will hopefully find a 6 volt pump with that fit the need. I will look for a complete kit with the filter,wiring and relay kit if available . I want to do this right and safe. Any suggestions would be highly appreciated. Thanks , bill
     
  3. CadMad
    Joined: Oct 20, 2012
    Posts: 602

    CadMad
    Member

    There should be 6 volt pumps available. I just run the mechanical pump on my 39 346. Never missed a beat. There’s rebuild kits available.Replace the lines if you are doing either.
     
  4. 54caddycoupe
    Joined: Oct 11, 2011
    Posts: 23

    54caddycoupe
    Member

    Thanks, yeah This is a first for me since I have always ran the mechanical pumps on all my caddies with no problems,, however after rebuilding the fuel/vacuum pump and running all new fuel lines the eccentric cam or something broke and quit turning the pump. So I decided for now I will just run an electric pump.
     
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  5. Gahrajmahal
    Joined: Oct 14, 2008
    Posts: 397

    Gahrajmahal
    Member

    Put a separate fuel pressure regulator in line. I did this on our MGB with electric fuel pump. It solved weird carburetor problems. Also put a rollover relay in the electric circuit for the fuel pump. It shuts off the power to the fuel pump during a crash.
     
    mgtstumpy likes this.
  6. 54caddycoupe
    Joined: Oct 11, 2011
    Posts: 23

    54caddycoupe
    Member

    Thanks for the tip. I was able to find a 6V pump which I installed and wired through the oil pressure switch to shut off the pump when the engine is not running. I will finish up the wiring and test it tomorrow.
     

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