I just figured cooling that whole area off more quickly in the summer has to be a good thing for life of all that stuff. In the summer I bypassed the thermostat so that it came on every time. I have taken my car to three different Firestone’s (they have checked the starter, battery, two of them did the engine diagnostics, but found nothing (one charged me almost 500 replacing spark plugs, filters and other things), the third. Living in central Texas the aux FI fan came on occasionally. I also got the message while perusing the junkyards and noticing that most of the wrecked FI models seemed to have a new(er) regulator so that tells you that its a common point of failure. ![]() I figured out that it was the regulator by noticing that when I turned the motor off that the fuel hose stiffness when way soft real quickly. Gone with the miracle of fuel injection, vapor lock was for many decades the annoyance of hot afternoons and summer vacations. After a long highway run and a quick stop it would often stall. The most similar experience I had was a failing fuel pressure regulator. I've also added heat shielding underneath those Su's. The way I ultimately fixed it was to install a flex fan for the radiator. I've had a lot of it on my 73 with 72 carbs. The situation of the vapor lock is highly perilous and can lead to fatal accidents. A series 1 without this revision, probably would have issues with vapor lock in the engine. This can lead to a loss of hydraulic pressure and reduced braking effectiveness, which can be dangerous for drivers. ![]() If the fuel pump is running, crankshaft position sensors fail frequently on your vehicle and will cause a crank but. A code scanner will likely lead you to the issue. From experience, an electrical component failed based upon heat and mileage of the vehicle. These vapor-lock tests were made in accordance with the CFR procedure, except that the warm-up was for 1 hr at about governed speed instead of for 50 miles at 50 mph as used for pleasure cars. My 330 GT is a series 2, so there is a small return pipe from the fuel log to the tank that is designed to keep fuel flowing even when the car is stopped and idling. Vapor lock is a phenomenon that can occur in a car’s braking system when excessive heat causes the brake fluid to vaporize and form air bubbles in the brake lines. It is very unlikely that a fuel injected engine is vapor locked (even at 108 degrees). You may have some heat related problem or bypass or relief valve problem but you don't have what is considered the classic vapor lock problem that happens on carbureted Z cars. The vapor lock only occurred on hot days (>80F) and driving at highway speeds.
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