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. (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.) 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. The bubble caps more-positive liquid trapping confers good operating-rate. Since about the 1950s, sieve and valve trays have virtually displaced bubble-cap trays, which are more expensive and offer lower capacity. Ive had issues with paint peel on the outer edge of bung from vapors escaping between the cap gasket. The most common tray-column vapor-and-liquid contactors are sieve, valve and bubble-cap trays. It’s important to reopen the valve slowly, as turning it too quickly could trip. A charcoal vapor canister costs 80 to 150. When the hose is in place, slowly reopen the propane valve a quarter turn. After you’ve waited, reconnect the hose, making sure it’s properly tightened. During this time, the propane regulator will reset itself. 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. Wait to reconnect the hose for about 30 seconds. 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. 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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