![]() ![]() This causes the metal fuel line around the tinware, the fuel pump, and the carburetor to all heat up somewhat, causing either excess vaporization of the fuel in the carburetor, or and actual vapor lock in the fuel line or fuel pump.Īs a result, starting is sometimes hard. The heads run at about 265-285 oF (130-140 oC) and can run up to about 355 oF (180 oC) on a really hard run which is pretty hot. The usual problem is that the whole engine gets thoroughly hot, and when you switch off, there is a 'heat soak' period when the temperature in the tinware and engine compartment rises because the residual heat in the cylinder/heats isn't getting blown away by the fan. They seem to be especially touchy both when they're hot and when it's getting close to "Tender Loving Care" time, when timing or valves may be a bit off the numbers. ![]() So right away you know the problem (right?) - vapor lock! Every VW we have had has done this when it got hot. So you lift the engine lid and notice right off that there is no fuel in that small fuel filter in the line between the fuel pump and the carburetor (if you have such a filter - we actually recommend that you don't have a filter here). As you pull off the road you think to yourself, "This couldn't be an electrical problem - the engine wasn't actually cutting out, just surging."Īlternately, you drive to the store on a hot day (far enough so that the engine gets thoroughly hot) when you return from the store to the car, it won't start! What's up with that!? Then, about 4-5 miles from home, the engine suddenly starts surging and then decides to take a rest altogether. The engine is working, and you know it's getting hot. It's 90 oF (32 oC) outside and there's lots of traffic, so accelerating and decelerating a lot. Have you ever had this problem? You are driving home from work late in the afternoon. ![]()
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