![]() ![]() References to makes and models contained in this document are to be considered only as a rough guide. WARNING: The makes and distinguishing signs of the vehicle manufacturers included in this document are only provided to inform the reader about the potential suitability of the said TEXA products to be used for the vehicles of the above-mentioned manufacturers. Remove the heat exchanger and clean the ducts.ĪTTENTION: before reassembling it, make sure there are not any foreign objects inside the ducts in order to avoid damaging the fuel supply system or the cooling circuit. This may cause an increased amount of vapors in the high pressure pump's module, therefore an increased risk of the development of the Vapor Lock. Turbine engines must start readily, and be able to restart while in flight. Gone with the miracle of fuel injection, vapor lock was for many decades the annoyance of hot afternoons and summer vacations. While it is desirable to use a fuel that is low in volatility to resist vapor lock and evaporation while in the aircraft’s fuel tanks, turbine engine aircraft operate in cold environments. ![]() This happens when too much water enters the combustion chamber. The actual term is Hydrostatic Lock, which has been shortened to hydrolock. Using these two systems, the formation of vapors in the fuel supply system is reduced along with the probability of the development of the Vapor Lock.ĭuring our tests we found that after an extended use of the engine, the water ducts in the heat exchanger may clog thus reducing the capacity to cool the fuel. The choice of turbine engine fuel reflects consideration of conflicting factors. Do not drive through puddles, as it may cause a hydrolocked engine. When the solenoid valve is activated by the engine management control unit, the vapors are aspirated into the engine's intake manifold upstream of the intake throttle. In order to further reduce the formation of vapors in the high pressure pump, this module has two vents connected to a 2-way solenoid valve, commanded by the engine management control unit, that closes the circuit in the engine's intake manifold. The later maintains a certain pressure in the supply system and the excess fuel is discharged into the heat exchanger so that it cools down and returns to the high pressure pump. The high pressure fuel pump is connected to the rail and to the fuel pressure regulator. The fuel flows through one of the exchanger's ducts, while sea water, that keeps the exchanger cooled, flows through the other duct. To face this problem, Yamaha applies a heat exchanger (commonly called radiator) to the outboard engines to cool the fuel. In this case engine ignition is very difficult. As a result the engine may lose power or turn off completely. The fuel's vapors may interfere with the fuel pump, reducing the flow rate pressure. It occurs when the fuel, which is in the vehicle's supply system, passes from a liquid state to a gaseous state due to a high ambient temperature (ex. The Vapor Lock is a common problem on petrol engines. Is there a better solution? What are the potential pitfalls with AWD or any drive system? R.P.Solution home General Marine Outboard Yamaha Marine Fuel Supply System - Vapor Lock Get some of that pipe insulation at HD or Lowes that is the diameter of your fuel line and put it over the line anywhere its exposed (not near the muffler, obviously). I hope he is right, because that is what went on the car, though the tread is half an inch wider on the new one. Most 'vapor-lock' issues are with the temperature of the air going past the fuel line. The closest match is the Bridgestone Affinity LH30 because it has the same overall diameter (26.6 inches), r.p.m. When I asked him to recommend a replacement, he said the most important considerations were the tire diameter and tire r.p.m., which sounds plausible. A Firestone technical service rep dug up the specs for the original-equipment Wilderness tires. I found detailed specs on Firestone's Web site for current Firestone and Bridgestone tires but not the ones on our Subaru. I wanted to get a tire that was as close as possible to the original-equipment tire. In addition, our lease on the Outback is nearly up so we would be giving Subaru four nearly new tires with no compensation. The other three tires have 9/32 inches of an original 11/32 inches of tread depth left. ![]()
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