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  • Fuel shut off valve

    Was recently thinking about installing a fuel shut off valve somewhere that I can access the valve from outside the car (in the event of a fire).

    Anyone done this before?

    Suggestions on a good location to install said valve? (Protect the valve from damage.)

    Also, a suggested valve. Ideally, I could picture a quarter turn valve.

  • #2
    Has been on my mind also. Perhaps a good quality solenoid valve just before the fuel pump. With ignition off, makes changing the pump easier, and if so desired can be switched as a theft deterrent. Preferably one with an override. Maybe there is something from the marine industry?

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    • #3
      Ive seen references to some installed back by the LR wheel from the tank.

      Located there might also assist in changing out the fuel filter I'd imagine.
      '74 TR6 CF13007U aka "Mr. T"
      Custom Blue (Delft-Like) and New Tan (Formerly Mallard and New Tan)
      Points, Ballast Bypassed, Bosch Blue Coil, Moss Cobalt Wires, Champion RN12YC plugs.
      Peaks and tweaks, but the spirit of Original
      Redlines always.
      My wife is the Driver, I'm just the Mechanic....

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      • #4
        Wouldn’t be a bad idea on the down spout of the tank where the rubber hose turn is before the steel line. I use a big brother 120 volt of this valve for the ozonator to my pool to keep water from siphoning back and pump losing prime. It’s on when the pump timer is on.

        https://www.ebay.com/p/1-4-NPT-Brass...ff120e3&chn=ps

        Make sure it has Viton seals, is normally closed and you can wire it to a key switched circuit so it opens when the key is on. You could also wire an inertia switch in series to turn the valve off if the car was not horizontal in case of an accident. Some electric fuel pump applications have that switch.
        Last edited by lfmTR4; 10-05-2018, 05:33 PM.
        72 Pimento w/overdrive

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        • #5
          I was thinking of installing said valve to prevent a fuel gusher in case of fire. Read Fid's post about Rosie again and how the fuel line on his car melted in the fire and when that happened the fuel just ran out by gravity . And the result was a catastrophe.

          One of his suggestions was installing a fuel shut off valve.

          I like the idea of a normally closed electric solenoid valve, but the cautions state that it is not meant for continuous use. Though no definition of continuous .

          And I believe the fuel lines are 3/8 on a TR6. (Could use a 1/2 inch and adapt to the 3/8 line I suppose.
          Last edited by ChandlerEast; 10-05-2018, 08:07 PM.

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          • #6
            Well they define continuous use as more than 8 hours at a time and that is because the coil can overheat in an enclosed area which wouldn’t apply to mounted on the frame below the chassis. Mine runs 12 hours a day in summer during daylight hours and 24 hours when temps are below 40 degrees in a waterproof box. Been working for a year and a half now 7 days a week. Not much to lose at $20 or so.
            Last edited by lfmTR4; 10-05-2018, 09:49 PM.
            72 Pimento w/overdrive

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            • #7
              Click image for larger version

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              Originally posted by ChandlerEast View Post
              And I believe the fuel lines are 3/8 on a TR6. (Could use a 1/2 inch and adapt to the 3/8 line I suppose.

              From fuel tank to fuel pump the hoses are 5/16th inch diameter.
              Form fuel pump to carbs fuel hoses are 1/4 inch diameter.

              Here is the easiest point in the rear to add a fuel cut-off.

              Last edited by SapphireBlue72; 10-06-2018, 12:48 PM.
              Walt
              CC80954U '72 TR6 original condition/sold 16.500.
              poolboy rebuilt the Z-S Carbs. Philstr6 rebuilt both rear hubs.

              Comment


              • #8
                If I understand your request correctly, you'd like an easy to get to shut off valve that could be used in an emergency e.g. a fire. I have mine screwed directly in to the tank outlet and I've seen them in the fuel line as it runs on the frame rail...... great locations for working on the car but impossible to get at without a lift or a tire removed. Is there anywhere on the frame that your can get to by reaching under the car? Summit Racing has some very compact shut off valves.
                1975 Mimosa with a few upgrades/mods:
                Patton TBI
                HVDA Toyota 5 speed
                Goodparts Nissan Diff
                Goodparts CVJs
                AAW Wire Harness
                Miata Seats
                Boyd Welding Custom 15 gallon aluminum gas tank

                Comment


                • #9
                  Originally posted by BobbyD75TR6 View Post
                  If I understand your request correctly, you'd like an easy to get to shut off valve that could be used in an emergency e.g. a fire. I have mine screwed directly in to the tank outlet and I've seen them in the fuel line as it runs on the frame rail...... great locations for working on the car but impossible to get at without a lift or a tire removed. Is there anywhere on the frame that your can get to by reaching under the car? Summit Racing has some very compact shut off valves.
                  Correct.

                  As per saphireblue's photo above, this is the location I was thinking about, however it would be impossible to reach in the event of an emergency . (To be able to turn if the valve was a manual style valve.)

                  But the "normally off" electric solenoid valve eliminates this problem. It could be installed at this location , connected to ground on the adjacent frame, and fed from an ignition feed.

                  In the event of a fire, shutting the switch off would cut the flow of fuel (which in normal situation will just keep draining by gravity feeding the fire)

                  I will check what kind of valves are available, but it has to be some how configured to support a 5/16 diameter fuel line.

                  But I can see how it could work.

                  Comment


                  • #10
                    Being an engineer, I know you can figure it out.
                    When you do get it configured, please post in photos & text what you've come up with.
                    It was heartbreaking to read about Fid's Rosie.
                    Walt
                    CC80954U '72 TR6 original condition/sold 16.500.
                    poolboy rebuilt the Z-S Carbs. Philstr6 rebuilt both rear hubs.

                    Comment


                    • #11
                      this is the set up that I am using in my restoration. Have not proven as the engine has not been installed yet. Let me know what you guys think!!I think I saw this set up somewhere online.Easy access from underneath the car.

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                      • #12
                        ^^^ is that valve rated for gasoline?

                        I'm just curious.

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                        • #13
                          I would use a ball valve, much faster to cut off...
                          Triumph TR6 - 1974 - Mimosa, O/D, black interior.

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                          • #14
                            If one wished to install a manual ball valve, I wonder if it would be possible to to mount one with a spindle extension through the rear cockpit panel? Don’t have my panel off so can’t confirm. May also be a possibility elsewhere, through the side of the transmission tunnel for example.

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                            • #15
                              Originally posted by Willo View Post
                              If one wished to install a manual ball valve, I wonder if it would be possible to to mount one with a spindle extension through the rear cockpit panel? Don’t have my panel off so can’t confirm. May also be a possibility elsewhere, through the side of the transmission tunnel for example.
                              This is what I was thinking as well. A manually operated valve that could be closed by pulling a handle from inside the cockpit. When someone designs one, please post photos so I can copy it!
                              Pete, Collierville TN
                              1976 CF54385 U
                              A rolling resto in progress...

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                              Fuel shut off valve

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