Have a 2000 ford explorer 4door xls 4wd automatic transmission.It has the 4.0 ohv After engine is warm it Vapor locks and won't run. Let it set and cool release air out of fuel line.Then runs fine?


Asked by Sep 01, 2015 at 06:37 AM about the 2000 Ford Explorer XLS 4WD

Question type: Maintenance & Repair

Until it's warm again then vapor locks  
again. I've pressure checked fuel pump,
new fuel filter, replaced map sensor and
new plugs??? Don't understand why it does

17 Answers


Try using higher octane fuel and add some system cleaner to the fuel tank...

1 of 1 people found this helpful.
Best Answer

Joemom@I've already ran injection cleaner through it and changed fuel filter. Because when issue first started acted like it wasn't getting fuel, or had a bad plug. Changed plugs and wires also. Changed mass air sensor also. This one has me stumped.


Vapor lock does not happen that much in newer cars. Try the higher octane fuel and continue to use the cleaner in the system. It may take some time to clean the deposits...

1 of 1 people found this helpful.

Joemom@ ty appreciate your input and time. I will try and see what happens. Ty again for your help


I just didn't understand why it only does it when the engine is warm.


One bottle of cleaner with not do the job, it has to be done on a on going basis.. Good Luck let me know how you make out...

1 of 1 people found this helpful.

Ty I will I know one isn't usually enough. I have already run 4 through it. But will keep it up and try the higher octane fuel.


Also try replacing gas cap.


Ty firebird338 appreciate your help and input. :)


You have a fuel injected engine with a pump located in the tank. Vapor lock is usually associated with carburetors and mechanical fuel pumps close to the engine. The fuel must be heated to a vapor in the line before there is a lock. Are you sure you have air/vapor in the fuel line?


OJ@ Yes I am sure it Vapor locked. I figured it out I lost the heat shield insulation that keeps the gasline that runs by the ehaust. That's why it was getting vapor locked. I know that it doesn't usually happen in newer cars etc because they are fuel injected...that's why I didn't understand what the hell was making it do this. Stumped me for a couple days. Figured it out today started and drove over 80 miles today with no issues. I appreciate everything and all the information it is helpful.


I released the air out of the line by opening the pressure release on the top of the motor it hissed. So it was vapor locked. Firebird338 the fuel system is pressurized, but in order for vapor lock to happen it happens after the sending unit. Usually because of a Cracked or heated fuel line. But I appreciate the thought.


If you getting Vapor lock which I don't think so with a newer, it happens when the engine gets hot and the fuel that is sitting in the line heats up and vaporizes and you need a liquid which is then vaporized as it enters the intake manifold. you can try to put some sort of insulation on the fuel line..


Joemom@ I did that if you read my comment above. I understand what causes vapor lock. I may be a chic but I have been wrenching on cars for 24yrs. Learned a lot being the only girl growing up with all brothers. Sometimes you have to go through the process of elimination. It was vapor locked. I know that...oh and yes it rarely happens in newer vehicle's since they aren't carburated. I appreciate your input and time.


My ford has a ovh motor the fuel line runs right by my exhaust the heat shield insulation that was there is gone. So I came to the conclusion that it was the problem. That's why it Vapor locked. Haven't had any issues since I replaced the heat shield insulation that runs by the fuel line that runs by my exhausted and then up to the top of my motor. I appreciate the insight and all the helpful information...while going through my process of elimination.


I've owned Explorers since 96, and your 2000 is the same vintage as my 96 and 99. I too once lost a heat shield. I lost the one near the exhaust which was attached to the side of the transmission to deflect heat away from the transmission. I did not discover it until I started to experience minor transmission problems. The shield is attached by two bolts to the side of transmission and is nothing more than a formed metal plate. If you see two threaded holes several inches apart your's may also be missing. Don't waste your time looking for one, Ford doesn't stock them any longer and junk yards tend to remove the thing (don't know why) when they remove the old tranny's and stock them for resale. I had to make one.


OJ@ thanks for the heads up on the transmission related issues it could cause. Very thankful for that information. Very helpful

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