9/1/2023 0 Comments Fixing vapor lock![]() I know, I know, it's a 470 and most folks don't like them but it's what I've got and I need to keep it running. What Is Vapor Lock There are several symptoms that may point to vapor lock. 6 611 Discussion starter Ok I feel a little dumb right now but what are some good ways of fixing vapor lock on a 4.0.I really don't come across vapor lock too much at work. Photo courtesy of : : w i n t e r t w i n e d : : on Flickr. (I was unable to get to the faqs area of the Mercury Marine website that was posted a while ago that dealt with vapor lock.) 11:50 AM EDT Vapor lock may prevent your engine from starting. You can, however, take some steps to relieve the. For example, if the vapor lock is occurring due to engine overheating or misrouted fuel lines, you’ll need to make some repairs to fix the problem permanently. When the fuel level is low, it allows more heat to transfer to the fuel lines, increasing the chances of premature fuel vaporization and subsequent vapor lock. Vapor lock can occur when the fuel level in the tank is too low. If anyone else has solved this issue ( I did a search and I see it has been on here a lot) I'd appreciate knowing how you did it. How Do You Fix a Vapor Lock Exactly how you address a vapor lock problem will depend on what caused the condition in the first place. To fix the vapor lock on a lawn mower, it’s important to check the fuel levels. And it was really warm under the engine lid. pump? How many psi of inlet pressure does the carb like? (I like the idea of two pumps, though).ĭon't see how I could insulate or shield the pump from the engine heat. Make sure the fuel lines are routed away from the exhaust system and other hot components to prevent vapor lock. pump wired to a switch to reprime the pump when this happens? Go to an electric pump and do away with the mech. So how can I cure it? Install an electric pump between the tank and the mech. Apparently it boiled the fuel pump dry and it lost prime. So the fuel pump is OK.Īlmost certainly a vapor lock condition. I mounted in a vise and primed it with fuel and worked it by hand and it pumps great. When I got home I pulled the pump and disassembled it, figuring it had a bad diaphragm. Suffered the indignity of being towed in by a Jet Ski. Pulled the tank cover up and checked suction filter in the tank and confirmed fuel level (3/4 full) Check valve working OK. Pulled the fuel pump suction line and it was dry as well. Fuel filters in carb inlet and on fuel pump clean. But when the carb bowl was empty the boat wouldn't restart.įuel not pumping from fuel pump. Apparently the fuel in the carb bowl didn't flash off, so that's good. It started and throttled up for a few seconds and then died. (How accurate is the gauge? Who knows) The boat wouldn't restart. ![]() Boat has a new lower water pump and the temp never approaches the red in the temp gauge. ![]() Out on the Ohio river today, 95 degrees ambient, ran about 2 hours then shut down for a while. ![]()
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