Question about 2002 Jeep Grand Cherokee

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Acts like old fashion Vapor Lock - 2002 Jeep Grand Cherokee

Posted by Hoyt Elrod on


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But is NOT.
EFI never does that, for many reasons.
High pressure system.
Pump in rear.
runs in a loop and will not build any air there or gasses.
my guess you mean?

  1. What engine option , size and cyl count.
  2. Does it misfire (rough and violent misfire, is that)
  3. Does it bog, ? hot or cold engine or both?
  4. Does the cluster waring CEL lamp glow running?
  5. Did you SCAN it? yet, and for sure running?
  6. did you do the 60,000 mile tune up yet? (repeats)
  7. Engine compression good, and fuel pressure at spec.
  8. by now ,it's found. i bet. but. if not ,tell the story. we can find them all.
Stalling? Vapor lock does stall engines. (carbs)
lost engine power, same.
is the lose of power up hills and for sure wide open throttle?
lost power only with fast right foot and recovers.???

these questions find cause fast.

Posted on Mar 29, 2014


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doubtful that vapor lock is an issue on a fuel injected car. it was something that happened on old vehicles, and you just don't hear about it any more. It doesn't happen because of the high fuel pressure in the fuel lines of fuel injected vehicles. If the vehicle is cranking and won't start, it might be a fuel issue--getting no fuel because of a fuel pump issue. But not vapor lock.

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98 olds bravada. Acts like fuel vapor lock. New pump 1 year new filter 1 month. When it happens outdide temp over 103 and will restart after a few mins.

Do you hear cooling fan coming on ? After you shut the vehicle off the fans will still run for up to seven minutes if hot !

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Just did tune up on explorer but still acts like it is not getting fuel sometimes especially when warmer outside

"Tune up" doesn't deal with fuel issues. Fuel pumps do get old, and then have less capacity. When it's warm out, you need more fuel pressure to control vapor-lock.
To check, measure fuel pressure and confirm it's up to proper level.

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What is vapor lock?

Vapor lock is when a fluid in a closed system, such as in a hydrolic system, gets get hot enough to boil and produce vapor which unlike a fluid can be cimpressed thus rendering hydrolic systems inoperative. Fluids act as a solid when pressure is exerted on to them but in their gaseous state (vapor) they can be compressed and the pressure needed to move pistons is instead absorbed by the gas rather than applied to the pistons.

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Vapor locks

It could be a vapor lock but not likely. Since the introduction of fuel injection vapor lock has been eliminated.
You need to figure out if you are loosing fuel pressure or spark when it will not start back up. Could be a fuel pump relay or ignition module among other things. Even a problem with the vent for the gas tank.

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My 95 taurus will act like it is vapor locking on hot days. This only happens during the summer when I do more than just drive to work and back. I have had two certified mechanics look at it and change...

I would forget the vapor lock theory. It ran okey for years,so why not now
Vapor lock goes back 35 years to carburators and road race cars.
Do you ever get a Mil Light on dash or stored codes?
What tests were done to warrant O2 Sensors?
Did you have any overheating issues,or just thinking so?
Don't overlook an old and partially blocked converter. You haven't said what your drivability issues, really are!
Fuel systems aren't really to heat sensitive or know when summer is here.
You need to think simple, Ignition,fuel filter,pump could be partially plugged and working, but not much volume.
Tape a fuel pressure gauge to windshield and go for a drive.

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1 Answer

Acts like vapor lock

when they went to fuel injection the fuel that was not used returned to the tank thus cooling the fuel and ending vapor lock, my question is did you do a fuel pressure test? and di you do a fuel leak down test? and the first thing I would do is change the fuel filter. with ethanol in the gas it kills the filter. I have to replace mine every three months they just plug up from that junk. Other than that the only other thing would be a coil breaking down when it gets hot the coil shorts out when cool it starts so check those things first. be sure fuel pressure is 50 to 60 PSI and does not drop below 30 PSI for at least a minute, if it does the fuel pump check valve is bad, also the fuel sock could be bad as well.

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Is it vapor locking or not? All else shows okay.

vapor lock just doesn't happen on newer cars that are fuel injected like yours, it was carburetor equipped cars that vapor locked

Jun 25, 2009 | 1989 Oldsmobile Cutlass Cruiser

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