Re: 1940-120-runs fine for a while , then sputters and quits

Posted by Peter Packard On 2008/8/2 5:29:34

G'day all, If the engine is just dying ( fuel)and not backfiring ( ignition) I would suggest fuel pump. The next time it happened I would immediately disconnect the centre lead from the coil, then disconnect where the fuel line enters the carby and get someone to crank the engine for 30 seconds while you check for a consistent fuel flow from the fuel pump (carefully dispense it into a metal quart coffee can or similar, not onto the exhaust mainfold). If this fuel flow and delivery is satisfactory. I would reconnect the fuel line and the coil output lead. I would then disconnect the coil lead going into the distributor and hold it about 1/4 inch from the block and get someone to crank the engine with the ignition ON for 30 seconds and check for a strong and consistent spark.
I am more inclined to believe that it is your fuel pump as those internal valves do wear out and a hot motor would bring out this fault. Also check that you do not have an alien blocked filter fitted in the fuel line between the tank and your fuel pump. I had a blocked alien fuel filter in one of my cars and it nearly drove me crazy trying to figure out why my car was pinging on hills. ( it was running lean due to a blocked fuel filter near the tank). Of course a blocked fuel cap vent and others mentioned are also good candidates. Best regards Peter Toet.