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2000 Mercury Mountaineer 5.0 Vapor Locking?

2000 Mountaineer 5.0L. Truck runs great at 126,000 until the air temp. gets above 95 degrees and I run for a 30 to 100 mile trip. the merc. will jerk-get gas not get gas something like a clogged fuel filter but not. ive owned a carburated vehicle that has vapor locked and know the feel. EFI vapor lock? everyone ive talked to says no way. HELP PLEASE!

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Maybe what you have is not vapour lock as such but a vacuum forming in the tank and not allowing the fuel to be pumped to the injectors. I would be checking the canister and canister controls to ensure adequate venting. I f the fuel tank has been continuously filled to the filler neck then fuel can contaminate the canister and not allow it to work properly. In short I would be looking for reasons in that area Run fault code check and see if any fuel related problems are presented.

Posted on Jul 17, 2013

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We have a toyota 2000 camry which stalls after long distance driving. we have replaced the cool and temp sensor and found the air flow box wasn't connected. it is now and still stalls


Do you live in a hot climate? I have not heard this happen on newer cars but it sounds to me it is vapor locking.check and see if the gas lines run by anything that gets very hot. I worked a 2005 ford truck that was doing the same thing. I had to run the gas lines on the other side of the frame. Good luck

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Most run at 200-210 degrees so the temp you stated is fairly normal....Vapor lock generally is associated with mechanical pumps that put out 5-8lbs of pressure...the electric pump in your car puts out over 40 when needed and unless you're running in the desert, it's doubtful that it's locking.You need to do some testing to determine exactly what pressures you have at the fuel rail, if you are getting good spark etc. in order to determine what's going on there. Don't work blind...get a manual like chiltons or haynes that can give you specifications and test procedures...It's cheaper in the long run than just throwing parts at it 'till the problem goes away!!! If the engine is balky or slow turning the problem may not be fuel or ignition but may turn out ot be a worn out starter...That's why testing is so important!!! If you have any questions about any specific tests, don't hesitate to ask. Good Luck!!!!

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You didn't say whether your engine is a 4.0L v6 or a 4.6L v8 but if you have an excessive amount of air blowing back into air box and vehicle is running good otherwise you may have a stuck open PCV valve causing it to pull to much vapors from engine crankcase.
If it is a 4.6L it will be located in the valve cover itself.
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