vehicle vapor locking

[rockhound]

92 should be fuel injected

Very unlikely it would vapor lock, how about a fuel pump going bad instead

I have built driven wrecked and wheeled xjs for years, never saw a fuel injected xj vapor lock,

Vaopr locking usually is in the carbs of a non efi vehicle, you should not have pressure in your tank though, is your charcoal canister clogged?

There is a vapor collection system on the older xjs. It is supposed to collect excess vapors and is part of the vent system to the tank. Not sure of its origin or usefulness, whne they clog up the do not vent properly, if i recall mine was on the firewall on the drivers side

[GilpinGuy]

I had hesitation problems with my old XJ and it was the fuel filter - I think it was mounted on the frame on the drivers side. I've had several Jeeps though...

Start with gas cap, then fuel filter, then go on to more complex (and expensive) stuff.

[blackford76]

Just
Empty
Every
Pocket!!

[SideShow Bob]

Does this only happen when you are low on fuel (1/4 tank or less) ?
If so you could have rust particles in your tank, and when fuel is low they are concentrated and clog the filter/strainer on the end of the pick up tube in the tank. Even if it is one of the plastic tanks this is a possibility due to buying cut rate gas or using older gas stations that still have the old steel storage tanks.

[wctriumph]

Most likely cause is fuel tank venting, this is somewhat of an issue if used off road and not properly prepped. Some vehicles have vented gas caps that will eventually fail. Also, as was stated earlier, contaminants in the fuel system will cause hesitation so replace all of the fuel filters. If you are finding large amounts of debris in the fuel you will need to remove and clean out the fuel tank. While you are at it, install a new fuel pump too.

[HoneyBadger]

Just
Empty
Every
Pocket!!

Ya know, I've heard a lot of people whine about this, but I guess my Jeep experience was unique.

Sorry to take the thread OT...

in 2008 I bought a 95 Grand Cherokee Laredo with 161k miles on it for $2500. I left it stock and just used it to get around town and [occasionally] head up Mt Herman road or Rampart Range Road to drive some jeep trails. No rock crawling or anything crazy, but I did some offroading that scared the crap outta me.. Almost rolled a few times, at one point I got stuck with just 2 wheels making contact: my front left, and back right; there was about a 4 foot deep pit outside the driver's door, so I couldn't even get out to survey the situation. Ended up getting through it and finding an alternate route back through. I got stuck on a tree stump once because I wasn't paying attention and had to be lifted off by a REAL off-roader who laughed at me in my Laredo... My wife was driving it and got hit by a red-light runner, which totaled it in 2011. It had 188k on it then and still ran fine. During the 3 years I owned it I never took it into the shop for more than an oil change or tire rotation. When it was totaled, the insurance company gave us $2700 for it. I never had a complaint, and I wish I still had it.


....And now back to your regularly scheduled programming: Possible vapor locking problems for the OP.

[rockhound]

Ya know, I've heard a lot of people whine about this, but I guess my Jeep experience was unique.

Sorry to take the thread OT...

Ended up getting through it and finding an alternate route back through. I got stuck on a tree stump once because I wasn't paying attention and had to be jacked off by a REAL off-roader who laughed at me in my Laredo... My wife was driving it and got hit by a red-light runner, which totaled it in 2011. It had 188k on it then and still ran fine. During the 3 years I owned it I never took it into the shop for more than an oil change or tire rotation. When it was totaled, the insurance company gave us $2700 for it. I never had a complaint, and I wish I still had it.

.

SORRY, but how did this help get you unstuck?????????

[HoneyBadger]

SORRY, but how did this help get you unstuck?????????

Awwww shiiiiiiiit....

[rockhound]

i have trail rescued plenty of other jeepers and have been rescued by a few also,

this method never occurred to me

[blackford76]

While you are checking fuel pressure, look at the injectors themselves. Specifically where the fuel rail hooks to them, and where they seat into the intake. The 'O' rings used to seal them were prone to failure. I would think that by now they have been replaced, but it won't hurt to look to see if any fuel is leaking past them.

Most likely a bad gas cap.