fuel boiling solutions

Fuel and Air Systems

  1. hunt2elk

    hunt2elk FBBO Gold Member FBBO Gold Member

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    That is the filter I was looking at. Should work the same as the original style vapor separators?
     
  2. Sonny

    Sonny It’s all fun til the rabbit gets the gun. FBBO Gold Member

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    The problem I had with those is that takes the pressure down too far. I went to a 9 psi pump, Holley regulator, and 1/4” return line. Keeps pressure at 6.5 and still circulates the hot fuel back to the tank.
     
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    • sputnik 440

      sputnik 440 Capt Jim FBBO Gold Member

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      I had the same problem of boiling the fuel out of the Holley 850 DP on a 440. I tried insulating the lines and filter and already had a 1" phenolic spacer. I was told a return line would eliminate the problem. I wasn't sure it would. I bought a Mopar vapor separator and am adding to the mechanical pump. I have 3" headers and ported 915 heads. I was not sure all of this would solve the boiling problem. I drove home from a 15 mile run on a 90*+ day, shut the engine down and lifted the hood and shot the temp with a gun. Carb was 205*, headers were 320. I let the hood open for 2 min and then shot the carb and headers. Carb 160ish and headers 305ish. Closed the hood and waited 5 minutes. Opened hood and shot carb and headers. Carb 190* and headers 280ish. (I didn't write the exact number down, didn't need to) The whole problem for me was the residual head coming from the headers. In order solve the problem I went to two electric fans with two relays and a Daytona Digital Controller that will not only supply the needed air through the radiator, but will continue to "exhaust and cool" the engine compartment for up to 5 minutes. In my case, problem solved and backed up with the vapor separator.
       
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      • Sonny

        Sonny It’s all fun til the rabbit gets the gun. FBBO Gold Member

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        That’s a great solution. I have non ceramic headers too.
         
      • coronet68mx

        coronet68mx FBBO Gold Member FBBO Gold Member

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        Also cool collection of mopars...
         
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        • 68 Sport Satellite

          68 Sport Satellite Well-Known Member

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          Excellent video. I didn’t know there were 2 types of 3 port fuel filters. I wonder how to decide which to use? Maybe try both to make sure no restriction of carb supply fuel pressure?

          I also wonder if a heat shield wrap around the mechanical fuel pump is worth doing?
           
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          • coronet68mx

            coronet68mx FBBO Gold Member FBBO Gold Member

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            The problem itself is the modern gasoline, it boils, the modern cars with FI don't have that problem because of the high pressure the injectors require, the fuel line is pressurized the hole time, beside isolate the pump is no help because the heat itself is in the carb, in so many words, carbs with modern gas are doomed.
             
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            • 68 Sport Satellite

              68 Sport Satellite Well-Known Member

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              But if you watch the video he says that the fuel boils in the carb AND the pump. So even if you shield the carb, it could still boil in the pump. With the 3 port fuel filter keeping fuel moving through the return line, maybe it’s a moot point.

              I used to have my return line hooked up but last year when doing some fuel line wrap and re-route work, a knowledgeable mechanic convinced me to disconnect it, saying that with carbs it’s no use. I shouldn’t have listened to him. If I remember correctly, I left the line in place but just disconnected and shortened it on the engine side. May need to rig it back up. I haven’t tested the car under heat soak conditions yet this year.
               
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              • hunt2elk

                hunt2elk FBBO Gold Member FBBO Gold Member

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                That was interesting, thanks for posting it. I think I will try one of those WIX filters with an orifice on my current project.
                 
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                • rrTor-Red

                  rrTor-Red FBBO Gold Member FBBO Gold Member

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                  Here is another good one to watch

                   
                • coronet68mx

                  coronet68mx FBBO Gold Member FBBO Gold Member

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                  A mechanical pump is connected to the block, the block is hot, just for the fun buy an cheap electric fuel pump ( with the solely purpose of test this idea) connected away from the block and the new fuel filter and try it, that's what I would do.:thumbsup:
                   
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                  • rrTor-Red

                    rrTor-Red FBBO Gold Member FBBO Gold Member

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                    FYI-My video I posted is a option. I'm considering it but I saw Mopar fuel vapor seperators on line fairly on the cheap side. I migh plumb in one of those.
                     
                  • 68 Sport Satellite

                    68 Sport Satellite Well-Known Member

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                    Anyone have a part # for the 3 port style orifice and non-orifice in line fuel filters? I can’t seem to find one on summit.
                     
                  • 68 Sport Satellite

                    68 Sport Satellite Well-Known Member

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                    Anyone?
                     
                  • coronet68mx

                    coronet68mx FBBO Gold Member FBBO Gold Member

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                    Indeed anyone...
                    :popcorn::popcorn2:
                     
                  • 68 Sport Satellite

                    68 Sport Satellite Well-Known Member

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                  • rrTor-Red

                    rrTor-Red FBBO Gold Member FBBO Gold Member

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                    I emailed Wix and waiting on a response. I also emailed "Uncle Tony" as per the Youtube video to find out where he got the Wix filter too and waiting on his response as well.
                     
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                    • gdrill

                      gdrill Just enjoying "B"-ing here FBBO Gold Member

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                      Tony rocks! He has a bunch of good videos.
                       
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                      • R/T

                        R/T Well-Known Member

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                        WIX 33040
                         
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                        • 68 Sport Satellite

                          68 Sport Satellite Well-Known Member

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                          I found an old FBBO 2012 thread on this. If you want the filter with the vapor return line coming off at a 90 degree it’s Wix 33054 (5/16”). Not sure for 3/8”. Install between pump and carb with the vapor port facing up is what the thread recommends.

                          My 2 port in line filter is between tank and carter mechanical pump on passenger side and never had a problem. Doesn’t look like much room to install between pump and carb without it living in front of tbt air cleaner...
                          https://www.forbbodiesonly.com/moparforum/threads/what-is-this.39825/
                           
                          Last edited: Jul 6, 2019
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