No announcement yet.

gas valve rebuild

  • Filter
  • Time
  • Show
Clear All
new posts

  • gas valve rebuild

    It's a rainy day so I was going thru a box of parts for my 31 Victoria and found the original gas shut off valve. The valve is stuck in the open position and I can't budge by by hand. I can loosen the handle and the bigger nut under the handle. How are these rebuilt. ?

  • #2
    It is tapered inside, like an old stove gas valve. With the top and bottom disassembled you should be able to tap it apart. Use a lead or plastic hammer. Be careful not to bugger up the threads. Little bits of rust/crud cut groves as the valve is turned, creating leak passages. Depending on how deep, you may or may not be able to lap them out with fine valve grinding compound. If you get that far you can further refine the finish lap with toothpaste.

    I have fixed a few with nasty grooves by tinning the grooves full of 95/5 solder and then carefully redressing the profiles. You need to eliminate the grooves in BOTH the body and spindle. Rubbing paraffin (birthday candle!) on the spindle before reassembly helps lube it a bit as you fiddle with the adjustment.

    Now the downside- If you do manage to clean it up to a good sealing surface, the first time you put it in an 80 year old A and it encounters a spec of rust in shear while closing you will cut a new leak groove.
    Mechanical engineering 101: If you put an adjustment knob, screw, bolt, or tolerance specs on something, some people will immediately fiddle with it. If you mark it DO NOT TOUCH everyone will mess with it.


    • #3
      Shouldn’t the filter prevent that from happening again?


      Brian French
      You do not have permission to view this gallery.
      This gallery has 1 photos.


      • DaWizard
        DaWizard commented
        Editing a comment
        Brian, you are correct, the filter should prevent that happening again, but the pieces are soft brass so it doesn't take a rock to cut a leaking groove, just a leetle pebble and you have a gorge worth of hanging up and leaking.

    • #4
      MikeK X2

      Be sure to install a finger filter that fits in the top of that valve into the tank.
      Last edited by DaWizard; 10-22-2017, 06:25 PM.
      You wana look waaay far up da road and plan yer route because the brakes are far more of a suggestion than a command!


      • #5
        Thanks for the info. I did get it to move but have not been able to get it apart yet. Not sure how you could tap it apart with a hammer.


        • DaWizard
          DaWizard commented
          Editing a comment
          OH NOOOOO not a hammer, I just use a pair of pliers to pull the valve from the body.

          You have the style with the large nut and packing, not the early '28 style with the spring and cotter pin.

      • #6
        Art FYI you originally posted this thread in the Model A for sale area, so i moved it for you. You'll probably get more advice here
        3~ Tudor's & 1~ Coupe
        Henry Ford said,
        "It's all nuts and bolts"
        "Start by doing what's necessary; then do what's possible; and suddenly you are doing the impossible."

        Mitch's Auto Service ctr


        • #7
          Thanks Mitch, I got the valve apart with some gentle tapping. Thanks VFF !


          • #8
            The filter on the valve is a bad idea. It is just a band aid and does not fix the problem of the dirt and reduces the range you can drive on one tank.
            Flush the tank a number of times. I put a ball valve on and put stuff in and shook the car. Got most of the stuff out.
            Then I put a short pipe on the original valve so the dirt can not settle into the valve.
            Run for a while, years, tank fulls and monitor the stuff trapped by the original filter screens. The amount of stuff trapped goes way down after a short while.
            Once the amount of stuff being trapped by the original fuel filter seems to be way down. Take out the pipe so you can use all the fuel in the tank.


            Related Topics


            • A31Woody
              Leaky Gas Shutoff Repair
              by A31Woody
              Is it possible to fix a leaky under tank shutoff while it is still in the car? I tried to remove mine, but it feels like it will take the threads with it if I remove it. Carb is leaking from time to time even after running the car out of gas by shutting off the valve.

              My other option is to put an after market valve in the fuel line inside the engine compartment. If I end up doing this,...
              06-19-2017, 09:59 AM
            • wrndln
              Rebuilding gas valves question
              by wrndln
              I have posted a question or two about rebuilding 28/29 gas valves. Most people have said to use toothpaste as a lapping compound. I chucked the stem in my drill press and smeared toothpaste on the part that has is tapered. I got nowhere after several "grinding" operations! I don't think toothpaste is "gritty" enough to remove minor grooves. I have talked to a a person that...
              10-03-2020, 01:28 PM
            • carolinamudwalker
              Gas shut off valve leak
              by carolinamudwalker
              I know this has been covered in the past but was hoping someone has a better answer. I gave up on the original shut off valve after three tries and installed Bratons massive valve with copper lines. This valve leaks at the flared fittings, both at the original shut off valve and the inside flare of the filter bole. I dont dare tightened the nuts any more. Is there any thread sealer that will...
              01-13-2021, 08:55 AM
            • BillEbob
              Who sells shutoff valve that works?
              by BillEbob
              I’m disgusted with the shutoff valves that I’ve purchased. Just rebuilt a “backup” carburetor that was overflowing with gasoline overnight >> 2 problems obviously, the shutoff valve is not doing its job and either is the float valve, otherwise it wouldn’t have poured onto the floor.

              Can any of you recommend a source for a shutoff valve that does what it’s supposed to...
              03-04-2022, 05:58 PM
            • Grit Kid
              My last technical question for 2020!!!!
              by Grit Kid
              I'll be switching out my gas shut off valve in the Spring and changing out the pencil filter as the same time. Seems re-pop pencil filters are loose fitting in the shut-off valves from Snyder's. Any suggestions where or what can be done to get a snug new pencil filter fit in a new shutoff valve?...
              12-28-2020, 10:03 AM
            • Birdhunter555
              Fuel Shutoff Replacement
              by Birdhunter555
              Hi All,

              Go figure another question from me

              I noticed the smell of gas in the garage and noticed the carb was leaking. When looking at it, it looked as if fuel was all over it and not leaking in one particular place. The fuel shutoff is in the horizontal off position. I emptied the sediment bowl and checked in about 4 hours and the bowl was half full again.
              02-13-2021, 11:21 PM
            • dmaxweb
              Gas Tank Valve & Pencil Strainer
              by dmaxweb
              I purchased a new valve and strainer. The strainer does not fit tightly in the hole in the valve. If I remove the valve stem so as to not melt the o-ring, can I just use a propane torch to add a bit of solder?
              10-02-2020, 12:34 PM
            • Steve Plucker
              Fuel shut-off valve
              by Steve Plucker
              I know that the tapered inside part of the fuel shut-off valve should just pull right out of the casing (have everything removed to do so). But the darn thing will not come out. I can move it back and fourth.

              It is more than likely wore out within to remove the tapered part.

              Is there a secret that I am unaware of?


              07-26-2019, 08:08 PM
            • DougInAustin
              fuel shut off valve repair kit- any luck?
              by DougInAustin
              Hello all-

              I purchased the shut off valve repair kit (part #13270) to address a fuel leak in my Model A. A quick note to those of you new to Model As trying to diagnose the source of a gas drip leak- if the fuel is still leaking from your Model A in the garage (you can smell the gas) a few days after you shut the valve and parked the car, it's most likely the valve under the gas tank...
              01-06-2018, 03:18 PM
            • Soapy
              1930 Fuel Valve
              by Soapy
              I have been putting off the problem with the fuel valve that I have been thinking may have something to do with my coupe stopping abruptly. Since I put the valve in about 20 years ago, and since it had sat without running for a while, it occurred to me that there might be a bunch of sludge in the pencil filter. The problem was that there is about a quarter tank of good gas which must be at least...
              01-17-2022, 04:41 PM