![]() ![]() Installed an electric pump back near the tank with a bypass regulator as close to the carb as possible, and a fuel return line back to the tank. (the jets are much higher than the accelerator pump and run out first). Then when going WOT on the highway it would slow down, but a pump of the pedal gave it a little boost. I had to first install the spacer (open side UP), then block the exhaust crossover. When it doesn't start, have you ever tried holding the throttle wide open and cranked a while? If it starts then, it's boiling over in the carb and flooding the engine. I put a garden hose dowsing the fuel pump with cold water, (it takes a little while) but suddenly the filter fills with gas again. From what I've been through, with the plastic filter (for testing purposes), it fills with vapor and the car is still idling. Has it ever stalled while idling? It would take a hell of a lot of vapor to do that. Keep the gas pedal steady as the engine sputters to clear all the vapor. Press down lightly on the gas pedal while cranking to help vent any leftover vapor. Once the car has cooled down, start the engine. The spacer under the carb is phenolic or wood - correct? Anything else is not going to help reduce the heat transfer between the carb and intake manifold. Parking in a cool area (not on blacktop) Pouring cold water over the fuel system. For carb-equipped vehicles, one of the easiest solutions to preventing vapor lock is to use a thermal-barrier sleeve on the lines such as a Thermaflect Sleeve from Heatshield Products. Didn't have to worry about keeping that piece of tin lined up right when trying to put the intake gaskets in place. Then we would take those and push them into the crossover passage until it was blocked up. The next time it happens, I would pull the air cleaner and stroke the accelerator pump on the carb - if you're not getting a solid stream of fuel from it then that would verify your vapor issue.Īn old trick on the cross-over passage was to take heavy duty aluminum foil and make multiple balls of it about an inch or so in size. I would suggest getting the tubing type which requires removing the feed line between the regulator and the carb for installation - but it makes for a cleaner and nicer installation. There are a number of products that will work it just depends on how dirty you want to get. If we're talking header tubes then yes 5" helps but I would be looking to insulate the fuel line too. Fuel system vapor lock is a common issue that can occur in vehicles, particularly those with older or poorly maintained fuel systems.When vapor lock occurs, it can cause a variety of symptoms that can be frustrating and potentially dangerous.
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