I have a freind with a 2000 XJ and it is heating the fuel line up by the exhaust manifold to the point that it is missing. It happens when he is going slow, such as 4 low, and upon start up after it has ran recently. He was told by a mechanic that this is due to hot fuel, anyone ever heard of this?? Let me know if you need more info!! Much thanks!!

 

I have heard of this but the solution was to insulate the fuel line and fuel rail. This was then covered by the reflective silver duct type of tape. I only read the story and never actually saw it or any pics. Hope this helps your friend COS.

 

My 2001 does this. They call it heat soak. I need to fix mine as well

This is the TSB on it from Jeep
1803103 - 4.0L ROUGH ENGINE IDLE AFTER RESTART FOLLOWING A HOT SOAK
Date: 09/05/03 (supercedes 1802702 dated 09/06/02)

Model Year(s): 1999-2004

Description: NOTE: This bulletin applies to vehicles equipped with a 4.0L engine. This bulletin involves the installation of a fuel injector insulator sleeve.

Details: Customers may describe a 20 to 30 second rough idle following the restart of a heat soaked engine. This condition may be most noticeable when the engine is restarted following a prior 10 to 20 minute heat soak in hot ambient conditions of approximately 32 C (90ºF) or higher. This condition may be consistent with short city stop-and-go driving trips and can be aggravated by the use of fuel with a high ethanol content. Depending upon various conditions a MIL may occur due to DTC P0303 - Cylinder #3 Misfire.

This condition may be caused by heat from the exhaust manifold that following engine shut down migrates to the area around injector #3 and causes fuel vapor to form within the injector. This in turn may cause a momentary misfire of cylinder #3 until the fuel vapor is cleared of injector #3. The insulator sleeve lowers the injector #3 temperature to a point below which the fuel will not normally vaporize.

If vehicle exhibits a rough idle, and if a misfire of cylinder #3 is observed following a 10 to 20 minute hot soak, perform the Repair Procedure.

Parts required:
56028371AA Ignition Wire Shield

Repair procedure:
1. Cut insulator sleeve, p/n 56028371AA, to make two (2) insulator sleeves about 25-30 mm (1 in.) in length. See diagram.
2. Install one sleeve around injector #3, with the slit on the upward facing side of the injector. Install the other sleeve with the slit on the downward facing side of the injector.
3. Confirm sleeve is flush to intake manifold surface around injector.
4. Check injector #3 wire and ensure that the injector is rotated to a 2 o'clock position (from driver’s side of vehicle).

 

Much thanks guys, I'll pass this along!! Later!!

 

Yes, it is heat soak, but don't waste your time with the insulation trick. Most people I have talked to that did it said it didn't work.

I'll tell you how I fixed mine:

1) Hood vents

2) Aux fan overide switch

When I am on the trail and then stop, I turn on my fan with my switch (while the engine is off) and it sucks in the cold air and pushes out the hot underhood air out of the vents. I only have to leave it on for a few minutes and that does the trick.

 

Thanks Tup, good to know!!

 

No problem. It drove me crazy for a few years until I got my switch wired up.

In the meantime I used to either keep the jeep running while stopped, or pop the hood and let the heat dissapate to prevent heat soak.

 

please explain more about the switch. sorry im a goog!