Announcement

Collapse
No announcement yet.

Fuel pump vacuum

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • #16
    Well I got a new fuel pump. The other one was getting fuel to it but just wasn't pushing it up to the carb. Hopefully I can get that installed this week and give it another shot.

    I'm still concerned about the pressure building in the gas tank. I confirmed I do have a vented gas cap but it doesn't seem to vent anything. By the end of the day there's a bunch of pressure built up. What's the proper way to fix this problem?

    Comment


    • #17
      1) buy a new correct cap
      2) don't tighten it which would be OK for test drives and around the block
      3) drill a 1/16" hole through it

      Comment


      • #18
        I thought I did buy a correct cap. What's the difference between the vented cap I have and a correct vented cap? And where do I get one? I also bought a second vented cap that is supposed to fit but the tabs don't go deep enough. Drill a hole? Is that how the factory would fix this problem with a tank that doesn't have any vent?

        Comment


        • #19
          If you bought the cap at the local parts store, there is a good probability it may not be correct, as evidenced by the second one you bought that doesn't fit properly. One of our Thunderbird specific parts suppliers should have a correct one.

          No, drilling a hole is not how the factory would do it, but it would be a quick backyard mechanic fix to circumvent the issue. I am having a hard time understanding how pressure is building up in this tank for you when you can't be driving the car since:
          The other one was getting fuel to it but just wasn't pushing it up to the carb.
          With very limited run time, the only way I can think pressure can build up is by extreme temperature changes - like having the cap off when very cold and tightening it and then opening it when it is very hot for a day. What is causing the pressure to build up??

          Comment


          • #20
            Honestly I wish I understood what was going on. The car is sitting in the garage while I'm fumbling through these problems to get it started up. I have been leaving the cap on and there's probably a 20 deg temp change from day to night.

            Comment


            • #21
              Even with a vented cap all the old Fords that I've had build up pressure. It seems to be more prevalent in hot weather. It never seemed to effect the way the cars ran.

              John
              John Pizzi - Squarebirds Administrator

              Thunderbird Registry #36223
              jopizz@verizon.net 856-779-9695

              http://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htm

              Comment


              • #22
                Update! Apparently I need professional help. New fuel pump seems to be working great. That's one problem down. I guess I won't worry about the fuel tank pressure right now. It has been extra warm lately. I double triple checked that I was at TDC on the compression stroke and that the distributor rotor is pointed at number one on the rotor cap as well as checking my firing order (15426378). I turn her over and she seems to start up for a few seconds but just spits out the carb enough that it blows the choke plate wide open and dies. I have no clue where to go from here. Please help!

                Comment


                • #23
                  Final update on this thread. I was backwards on my timing. I was aiming for 6deg after TDC when I thought I was aiming at 6 deg btdc. All is good. Now that it runs it seems to want to kick into reverse. That'll be a new thread unless I can figure it out.

                  Comment


                  • #24
                    Glad to see that you got the timing sorted out. If the car slips into reverse try adjusting the manual linkage.

                    John
                    John Pizzi - Squarebirds Administrator

                    Thunderbird Registry #36223
                    jopizz@verizon.net 856-779-9695

                    http://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htm

                    Comment


                    • #25
                      Originally posted by Hazegray53 View Post
                      Final update on this thread. I was backwards on my timing. I was aiming for 6deg after TDC when I thought I was aiming at 6 deg btdc. All is good. Now that it runs it seems to want to kick into reverse. That'll be a new thread unless I can figure it out.
                      Wow, it is a wonder you didn't have some overheating issues with the timing that much retarded!
                      Still, it's good that you've sorted it out, onto the next problem!
                      A Thunderbirder from the Land of the Long White Cloud.

                      Comment


                      • #26
                        Well the thing wouldn't stay on long enough to heat up. I adjusted the linkage as suggested so I'm good to go. I didn't have that set up right either so it had room to pop itself into reverse. Just need to work on some carb adjustments and I should be able to take a test drive around the block. Can't say thank you enough for all the help I get here.

                        Comment

                        Working...
                        X