Vapor lock remedies12/19/2023 This vaporization of fuel interrupts the fuel delivery and leads to problems like difficulty starting the engine, engine stalling, or reduced power output. However, under certain circumstances, such as high temperatures or an inadequate fuel supply, the fuel can turn into vapor before reaching the carburetor. Normally, the fuel flows from the gas tank to the carburetor, where it mixes with air to create combustion for the engine. Since the fuel is not flowing properly in the fuel system, the engine of a lawn mower stalls and doesn’t work smoothly as it should be working. Last edited by apairof66s on Sat 9:59 am, edited 1 time in total.Vapor lock on a lawn mower is a condition where the fuel of a lawn mower vaporizes before it reaches the carburetor and combustion chamber. It's the only part of the cooling system that hasn't been replaced or checked. He also agrees that the radiator may need to be flow tested, etc. We were both working on the problem with the motor running hotter than it should and contributing to the vapor lock. That's close enough for me with the Dart. gauge is working properly but may be off 10 degrees either way. This is the first time that the gauge reading stayed that low.Īfter talking to my brother-in-law (25+yrs. It was over 90 degrees when I drove it and the temp. This time they bought a metal filter instead of plastic. They also put the fuel filter in the factory location. They replaced the stat with the 160Īnd filled it up with 50/50 water and coolant. My son & his friend reverse flushed the cooling system, started by removing the thermostat housing. I'll post the results from the thermostat swap, etc.ĭrove the Dart a few days ago and it's doing fine. If it dies again we'll try removing the gas cap to see if it has a venting problem. I do like the fuel line mod but I'm going to wait on that. I'd like to have a shroud for it but it looks like that will have to be fab'ed. The radiator may need to be rodded out or recored, we'll know soon enough ! We were lucky to find hoses that worked great. down quite a bit but still not reading below "straight up".īecause the Dart had a 273 originally we had to use the V8 radiator and keep the slants fan. The one on the motor had the impeller reversed !!! It brought the temp. the Dart would run hot until we replaced the water pump. Going by the gauge it's running a little higher that I would like. My son is going to flush the radiator, replace the 180 with the 160 and see if we can't bring the operating temperature down. Yesterday we bought a 160 degree thermostat and coolant. Where the factory filter goes it has been replaced with rubber fuel line only.Īlso, when it did die the last time the carb was hot to the touch as well as the metal fuel line connected to it. It has been replaced several times since last year due in part to the poor mans method for cleaning the tank. We installed the fuel filter before the fuel pump to avoid clogging it. we replaced all the rubber and left the pickup screen off. Once we could see that the inside was clear of any sediment etc. We repeated this process a couple of times with the sending unit and fill neck removed. We put the best out of the two gas tanks in the Dart, and washed it out with water and then let it dry in the hot Arizona sun. I've been told about a couple of remedies but haven't tried anything yet. I've heard about vapor locking before but never had it happen to me. It will run great until the motor is warmed up and then it dies. A few days ago when it was raining we drove it around for at least an hour (just after the tune up) and it ran perfect. The weather here now is hot and humid and seems to have an effect on this problem. I explained the problem to my brother-in-law and he said it sounds like it's vapor locking. We ended up towing it home and decided to let it sit for almost an hour and then it would start right up and run fine. Yesterday when this happened it would crank but would not start up and run. Now what it's doing is completely dying after driving it for a couple minutes. The choke has been set and is working correctly also (thanks to the info from this forum!). The vaccum advance is connected and working properly. It's set at 2.5 degrees and idles at 750 rpm. We just replaced the points for the first time since the motor was installed and my brother-in-law helped out with the proper gap (.020) and we checked the timing as well. It ran great driving from Arizona to North Carolina in December. Holley),coil,cap,rotor,plugs, belts and hoses. When we installed the motor and tranny we replaced the fuel pump,carb (1 bbl. It has a 225 and 904 from another 64 GT and we've been driving it since late last year. The Dart is dying as if it is vapor locking.
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