![]() ![]() There is very little ventilation in my engine compartment and I am surprised more people don't have this issue. I have also considered mounting a radiator cooling fan back there somewhere to circulate air from the gunwales but I don't know exactly how to mount it yet. I am willing to try anything at this point because leaving the hood up attracts many fellow boaters trying to help because it looks like I am stranded. remember fuel under a vacum can boil at 50*F. looked for clogged, cracked, or bent or squished lines anything that would cause it to restrict flow, also check the gas cap might be worth replacing as they get older they dont relieve pressure or vaccuum which can also cause it, other wise it could be in the tank you may have to clean the screan in tank they tend to get rusty and clogged. sounds like its a fuel boiling in the lines (vapor lock) problem. vapor lock is caused between the tank and the pump. "you may also try adding the merc low pressure fuel pump kit to help prevent vapor lock and maybe the merc cool fuel cannister. Has anyone had any success with this fix : I am going to try insulating the lines or building some heat shields but I don't think that will work. My theory is that it is boiling the fuel in the lines before the cool fuel box as it passes over the engine and the pump cant pump the vapor. The pump is running but you can tell it is not pumping fuel because just before it is ready to start you can hear the pumps sound change because it is beginning to pick up liquid fuel. If you check the pressure on the rail when it is acting up it is 0 and if you try to bleed fuel off it does not have air bubbles although due to lack of pressure it barely flows out. I have checked for fuel system blockage and had the pump pressure and leak down checked at the dealer and it is perfect. The cold water will liquefy the vapors quickly. Make sure the ignition is OFF while you do the process. Pouring cold water on the fuel pump will cool down the system in no time. I have tried idling and running blowers that doesn't work. Let us divide the fixing process into simple steps regarding how to fix vapor lock. If I open the engine compartment when I stop it never misses a beat. Let it sit for a hour or two and it runs like a champ. I have all the symptoms of vapor lock on my 2008 5.0 MPI runs like a champ till you stop for a few minutes and then no start. ![]()
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