![]() ![]() Some fuel filters mounted in the engine compartment tend to aggravate the problem Recent changes in fuel formulas to reduce emissions by adding ethanol up to 10% by volume, have changed the temperature tolerance and made the seals in the fuel system,more subject to wear, or degrading over time, issues. Vapor lock is basically a fuel delivery condition caused by both heat and low fuel pressure where fuel turns to vapor in the carburetor or fuel lines, and the car won,t start as a result and the fuel pump won,t pump fuel effectively as a result.Ī return style fuel pressure regulator, like those used on most EFI systems generally help avoid vapor lock issues, for two reasons, first the higher pressure used, but more importantly, the basic design has a constant flow of fresh fuel coming up from the tank, and some routed back to the tank this tends to limit the heat level absorbed by the fuel, unlike the common carburetor dead head systems used on many early cars with carbs If you have not experiences vapor lock issues before this,its most likely because youve only dealt with high pressure fuel injection cars not carburetors, but are now recently dealing with an older carburetor equipped muscle car in hot weather, what may have (CHANGED) is either the fuel itself or the fuel pump may be dealing with wear or heat related issues, but in almost every case Ive investigated vapor lock is aggravated by the use of a fuel system thats not using a return style fuel pressure regulator. ![]() Viewtopic.php?f=55&t=211&hilit=inside+fuel+pump ![]()
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