Hard Start after shut down

Fuel and Air Systems

  1. Bruce Meyer

    Bruce Meyer Member

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    I have a new Brawler 650 on top of my 383. Initial start up it quick and easy. After the car for awhile, it will not restart until it cools off for about 15 minutes. Any tips on calibration techniques? Vapor lock? Air fuel mixture screws?

    Thanks
     
  2. Photon440

    Photon440 FBBO Gold Member FBBO Gold Member

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    Isn't that normal for a Mopar? It's even in the service manual.


    upload_2021-1-9_21-42-50.png
     
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    • khryslerkid

      khryslerkid FBBO Gold Member FBBO Gold Member

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      Probably vapor locking. To verify, after the 15 min you mentioned remove the air cleaner, pull back on the throttle and see if you're getting a squirt of gas. (Not familiar with a Brawler, hope it's not a fuel injection)

      If you haven't a good squirt, it's vapor locked. Gas has evaporated out of the bowl. A good cure for this is using a spacer under the carb that dissipates heat. Aluminum or wood works the best. Some have gone to the extent of installing a electric fuel pump with a return line to turn on before starting.

      Edit: I see the Brawler is the Holley. Some will use a thin plate under the Holley that extends under the float bowls to sheild the heat. A intake gasket with the cross over port blocked will help.
       
      Last edited: Jan 10, 2021
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      • kiwigtx

        kiwigtx International Mod Staff Member FBBO Gold Member

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        :rofl: ...surely that is fake. :D

         
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        • Bruce Meyer

          Bruce Meyer Member

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          Thanks for the input. I have a 1" aluminum spacer and a "Cool Deck" spacer on top of that to protect the carb bowls from heat. I'll check the "squirters" after warm up and see.
           
        • 64BEL

          64BEL Well-Known Member

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          But funny! :thumbsup::rofl:
           
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          • HALIFAXHOPS

            HALIFAXHOPS MSGT(ret) and MOPAR only distributor rebuilder! FBBO Gold Member

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            Make sure it still has spark during the hard hot start, can be a ignition part also.
             
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            • AR67GTX

              AR67GTX Well-Known Member

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              A lot of cars run on today’s gas will self-percolate fuel into the intake upon a heat-soak from a hot shut down. Basically they are semi-flooded when you try to restart and not lacking for fuel. As for any flooded condition, Typically pressing the throttle to the floor and holding it there while turning the starter will result in mine starting pretty quickly. Then try to release the pedal before it hits the rev limiter.
               
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              • Frank Mopar

                Frank Mopar Well-Known Member

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                I had hard start when hot. Chased all the obvious. Turns out it was the reluctor gap in the cheapie Summit electronic distributor.
                It takes but a minute to verify it.
                 
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                • 68BabyBlue

                  68BabyBlue FBBO Gold Member FBBO Gold Member

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                  My stock slant six Valiants all suffered from the self percolating issue back in the day. My 1970 GTX, less so. Had the hot start problem with my '62 Imperial with a stock 413 - turned out original coil was cooked, when it cooled after 15 minutes, I had good spark and quick start. My '68 GTX starts hot perfectly 99% of the time - has Holley Street Avenger with spacer, factory vapor separator, and Holley electric fuel pump. If it balks, it has always been from percolation, starts when cleared. My stock '69 GTX had major hot start issues the first year I owned it. Had vapor lock initially - factory vapor separator had been removed from system. Put system back to stock with vapor separator, helped but still had trouble. Turned out I was still starving for fuel. Replaced the stock Carter fuel pump with a new one, and now the '69 hot starts better than any Mopar I've owned.
                   
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                  • Ranger16

                    Ranger16 Well-Known Member

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                    Sounds a lot like a misadjusted choke.
                     
                  • toolmanmike

                    toolmanmike Moderator Staff Member FBBO Gold Member

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                    Like mentioned before, check for spark and check for fuel when it's hard to start then go from there. Fuel percolation is a big problem with today's gas. You may even hear it bubbling in the carb a few minutes after you shut it off. A spacer/insulator usually helps that. A fuel filter with a return line helps also.
                     
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                    • Unkwilly

                      Unkwilly New Member

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                    • myk r sanchez

                      myk r sanchez FBBO Gold Member FBBO Gold Member

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                      Easy things first, try a phenolic or wood spacer, at least an inch thick. I'm using an inch and a half and along with my electric fuel pump, no more hot start issues. Hood clearance is TIGHT on my car though...
                       
                    • Sixpactogo

                      Sixpactogo Well-Known Member

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                      My question is, when you say "hard start", does it crank over slow or crank for a long period before starting? Years ago, I had a car that would start fine when cold but after being warmed up would crank over slowly until it cooled down. Turned out it was a shorted plate in the battery that would get discharged while running, but would equalize with the other plates after shut down.
                       
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