Posted by Steve@Advance on May 06, 2020 at 06:18:36 from (24.182.105.128):
In Reply to: Old wives tales? posted by olddog on May 06, 2020 at 04:14:39:
Vapor lock happens when the fuel boils inside the line creating pockets of gas vapor instead of flowing liquid.
On a tractor, the convenient place for the tank was above the engine, and the line routed down beside the manifold would sometimes get too close to the heat and instead of liquid coming down, boiling fuel will send expanding pockets of vapor back up the line, pushing the fuel back to the tank instead of down to the carb.
On the old cars, the problem was multiplied by the fuel pump being at the front, which draws gas up from the tank. Liquid under even a slight vacuum will boil at a lower temperature, so as the pump creates vacuum, the gas is even more prone to boil both inside the pump and in the line.
Add to that the forward inertia of the vehicle accelerating, or going up hill, or both, which creates more vacuum on the fuel stream just as the demand for fuel is the highest!
As for clothes pins in the fuel line... Never understood that one. The problem is ahead of the pump, not in the line to the carb unless it is somehow routed too close to the exhaust heat, which would have been possible, but I still don't see clothes pins being a solution unless they were holding insulation around the line.
As far as fuel changing, no. It's the delivery system. High pressure pump in the tank pushing the fuel under pressure all the way to the injectors has no chance to boil in the lines.
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