Solving the evaporation problem when our cars sit for a while between starts.

Fuel and Air Systems

  1. crossram 426

    crossram 426 Well-Known Member

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    I had the same problem as mine sits for a few weeks sometimes between runs, so I just throw a capful of fuel down each carby and she fires right up straight away...
     
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    • Ranger16

      Ranger16 Well-Known Member

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      I simply prime the float bowls through the vents with a plastic bottle and she fires right up. Works every time.
      i7grU.jpg
       
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      • miller

        miller Well-Known Member

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        Yep, use a primer bottle on both mine.
        Would take a little work to set-up a boost pump, push the switch a few seconds, and go. (Those airplane boost pumps service a one inch fuel hose!)
         
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        • biomedtechguy

          biomedtechguy Accelerati Rapidus Maximus FBBO Gold Member

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          My recently installed :lowdown: Carter M6903 mech fuel pump was my solution for long cranking periods to fill the 3x2 Holley carbs. I just completely disassembled all 3 carbs after the car sat for a few months. Put them all back together and within <15 sec vaROOM.
           
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          • WarrickS

            WarrickS New Member

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            Hi Guys, I realise this is an old thread, but I thought Id let you know how I solved the fuel evaporation problem which as most of you know is the only problem Ive ever encountered with using Edelbrock Performer or the AVS800 I have on my R/T440. i presently own 3 x cars with Edelbrock carbs and this mod Ive done on 2 of them because the latest conversion I did on my 1990 Camaro from TBI to Carb didn't require priming because Im using the existing electric In-tank pump with a return regulator, so no need on that one. On both my 85 Z28 and my 67 Dodge Coronet R/T440 Ive fitted a Marine Dept approved 3/8" Mercruiser Fuel Priming Bulb fitted for easy access just prior to my Mechanical Fuel Lift Pump on both cars. Also I have fitted 0-15psi Liquid Filled pressure gauges between the Lift Pump and the Carbs. These conversions have been on the cars now since 2011 and have worked perfectly. The standard procedure I use on my cars before starting is to lift the hood, do a visual check all over for leaks anywhere, check the drive belts... and all fluid levels. Then I simply lean down and squeeze the Primer Bulb maybe 3-4 times until I see 5 psi on the gauge then I stop pumping all the while watching the gauge... if the gauge maintains that 5psi or drops to maybe 4psi, then you know the bowl(s) are full and ready. If once you stop priming the pressure on the gauge drops away you know its still not full and you can gently continue squeezing until the gauge holds steady at 5psi. Caution, yes theres always a caution... experience has taught me that simply squeezing merrily away until a positive/solid resistance is felt on the primer bulb.... will actually overpower the float needle and flood the bowl(s) these primer bulbs are very efficient at transferring liquids so a gentle touch is all thats required. In saying all the above, Ive only ever had to prime the system either if the car has been sitting for more than 1-2 days after a hot run especially during Summertime runs... or after sitting unused for an extended period like during the Winter months. Another important benefit of having such a mod is Instant Starting everytime... your Starter Motor and Battery will love you for it

            Marine Fuel Primer Bulb 3:8" (Mercriuser).png
             
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            • toolmanmike

              toolmanmike Moderator Staff Member FBBO Gold Member

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              Priming bulb. Great idea! Might be a little dangerous.
               
              Last edited: Feb 1, 2021
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              • Darter6

                Darter6 FBBO Gold Member FBBO Gold Member

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                How well is it standing up to under hood heat ?
                 
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                • toolmanmike

                  toolmanmike Moderator Staff Member FBBO Gold Member

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                  We were having that discussion over at FABO. I like the electric pump on a momentary push button switch better.
                   
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                  • Darter6

                    Darter6 FBBO Gold Member FBBO Gold Member

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                    That's what I use.
                     
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                    • toolmanmike

                      toolmanmike Moderator Staff Member FBBO Gold Member

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                      I bet it works well.
                       
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                      • Dennis H

                        Dennis H FBBO Gold Member FBBO Gold Member

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                        Right foot.
                         
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                        • dadsbee

                          dadsbee FBBO Gold Member FBBO Gold Member

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                          Bird and Bee hadn't been started since the last cruise mid October. Friday/Saturday I started both. Bee (Holley), mechanical choke on, one tap of the pedal, crank and run. Bird with it's OE Carter, that I have never touched a screw on in 31 years, crank engine over for a few cranks, stop, crank again with 2 pedal taps and runs.
                           
                          Last edited: Feb 1, 2021
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                          • 493 Mike

                            493 Mike FBBO Gold Member FBBO Gold Member

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                            I chose the Carter P60430 pump for my 65 318 poly 2 Bbl. I mounted a momentary push button switch on the bottom edge of the dash wired ignition hot to operate.
                            Mike
                            IMG_2495.JPG
                             
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                            • toolmanmike

                              toolmanmike Moderator Staff Member FBBO Gold Member

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                              Last edited: Jul 22, 2021 at 9:44 AM
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                              • toolmanmike

                                toolmanmike Moderator Staff Member FBBO Gold Member

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                                • 493 Mike

                                  493 Mike FBBO Gold Member FBBO Gold Member

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                                  • toolmanmike

                                    toolmanmike Moderator Staff Member FBBO Gold Member

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                                    I haven't got one yet. I bet it would take care of the short hot soak hard start as well. You know, after a drive you shut it off and restart it in a half hour in front of your buddies and it won't start without cranking on it for a min. or two. LOL It act's like it's flooded but it's not. Vapor lock I am guessing. Push the button and fill the carb with gas and fire her up.
                                     
                                  • blue69runner

                                    blue69runner Well-Known Member

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                                    So has any one put a fuel check valve in the line at the inlet of the carb. We use to do that back in the day. Never had a dry carb. One tap on the accelerator pedal to close the choke and off it went. But good info thanks for the reading material.
                                     
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