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    #16
    Garage ran the car around with a pressure gauge attached and it gave a constant 2 1/2 to 3 psi, but not done a flow test ?. When you switch on from cold the filter fills up rapidly 3/4 full. Don’t know about a vacuum in the tank, I renewed all the pipes in the boot last year ?
    cheers mark

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      #17
      It probably isn't air in the filter but is in fact fuel vapour. It will condense when the engine is cold so will seem to disappear.

      Missing after a hot start is often caused by a rich mixture. The fuel boils in the carbs after switching off the engine, and the heavy fuel vapour falls into the manifold under gravity effectively flooding the engine on a hot start.
      I sometimes get this problem with Strombergs but also used to get it with a Holley. My fix was to fit a dash mounted switch to the electrical feed to the fuel pump and then switch off the pump 10 seconds before I switched off the engine. This meant the engine would start with a weaker mixture and cured the problem (which was worse with the Holley).
      It also meant that if the car was stolen it would only get about a quarter of a mile before stopping.
      Neil
      TV8, efi, fast road cams and home built manifolds. 246bhp 220lbft torque

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        #18
        +1 for what Neil says. I had the same problem with my car on Strombergs. Fine if parked for 5-10 minutes or 2 hrs plus, but if left for 30 mins or so it was a nightmare. Eventually cured it by new needle valves, very carefully Re-setting the float heights AND fitting steel braided fuel hoses under the bonnet (from EJ Ward) to reduce fuel temperature. Previously it would idle when started hot, but as soon as you tried to drive off, the extra vacuum pulled in the evaporated fuel and flooded the engine. Not had any problems since.

        ian F

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          #19
          Ian, that sounds exactly like I am expieriencing, did your car clear itself after a short while. It always starts first time hot or cold and sometimes when hot is ok and sometimes not, could be the time span like you have mentioned ( I've not thought about the time span ).Does your car have the air valves on the outside of the carbs operated by the throttle cams ?.Mine don't but a spare set I have do and I'm thinking that might be a better type as they might vent any vapours?.Any thoughts about them.I have looked at the braided hose so will invest in that .
          cheers Mark

          Comment


            #20
            Originally posted by Stokiestag View Post
            .Mechanic suggested crap in the tank
            sorry, Fnarrr How often should you do that then I know very childish

            Originally posted by Stokiestag View Post
            Out came 5 lumps of lead and bits of rusting mesh !!.
            I always wondered who buys this stuff

            Anyway question Mark

            Are you still running the viscous engine fan or has it been removed?

            Is your fuel pump still pojnts item or a more modern solid state jobby?

            My point unit kept failing on me, often at the most inconvenient times, ignition off and back on was normally enough to fire it back into life.

            replaced it with a solid state unit but that pushed out too much pressure and flooded the strommies. Filter king regulated to 2.5psi fixed that
            Stags and Range Rover Classics - I must be a loony

            Comment


              #21
              Yes, viscous fan still working with a back up electric job at the front, brand new pump but made no difference. Going to try braided hose next, just been out for a 30 mile run, never missed a beat, really frustrating.
              As soon as I posted that comment I wondered who would make funny. Told the mechanic I would need a very big funnel

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                #22
                Mark, I assume you mean the temperature compensators, then Yes, mine does have them fitted. Don’t know of any other “vent” valves? I think it was a combination of things in that new needle valves restricted any seepage, Re-setting the float levels (making absolutely certain they were level AND at the right height) and the cooler fuel because of the steel braided pipes all contributed to curing it. But yes, if I revved the balls off it I could burn off the excess fuel, lots of black smoke and stunk of fuel but it would clear and behave itself. It was clearly the heat soak and how long I left it parked up and it was a pain in the proverbial ‘til cured.

                Give it a try and hopefully you’ll win.

                Ian F

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