Thank you very much, Greg, Kykhayman, Burnie and Rgx Tv, for your info and help.I had wrapped the fuel lines with the shiny side in, so I will take the foil out and rewrap new ones with the shiny side out. Greg, the fuel filter was changed a couple of months ago, and the fuel pump just over a year ago. They may well have sold me a poor quality pump though, lots of Taiwanese parts being passed off as Japanese ones in Malaysia. I"ll have to check it out again and maybe try replacing it. I"m thinking of modifying to an electric fuel pump. The ignition system has been checked out thoroughly - the contact points, condenser, plugs and plug wires replaced. I"m using a points-triggered electronic ignition unit made from a kit, the Motorola IC similar to the one used in the older GM high energy ignition systems, and it appears to be working fine. The ignition coil has been replaced too. Initially the distributor"s vacuum advance was a source of the sputtering and stalling, but that has since been rectified. What happened was that the original vacuum pump had given way, and the only replacements here were generic "Century" brand units from Japan (or so the label said). This advance unit has a plastic adjuster screwed in at the end for fine timing adjustments, but it was not heat durable (unlike the stock unit) and virtually disintegrated after just a few months, and the ignition timing nosedived when it did. So I managed to fashion a copper adjuster and screwed it in, and the timing is holding out well so far. The fuels in Malaysia are 97 octane "premium" and 92 octane "regular". Both are unleaded, and contain benzene (a carcinogen actually). I am using 97 octane. Might switching to 92 octane help with the vapor lock ? The carburetor is very basic really, the only hose coming out goes to the vacuum advance. There are no emission controls requirements in Malaysia, at least for engines built in the 80s. RGX TV, er, how does one use clothes pins for vapor locking ?
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