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Yj: checked everything. Jeep 4.2 . Fuel seems to be vaporizing

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checked everything. Jeep 4.2...
checked everything. Jeep 4.2 . Fuel seems to be vaporizing or no fuel. Starts and idles good. just dies when you try to move it. Help please.
Submitted: 2 years ago.Category: Jeep
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Answered in 1 minute by:
6/18/2015
Jeep Mechanic: Tim Mohr, ASE MASTER TECH replied 2 years ago
Tim Mohr
Tim Mohr, ASE MASTER TECH
Category: Jeep
Satisfied Customers: 16,197
Experience: 30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL
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Hi, y name is ***** ***** you checked the fuel pressure yet?
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Customer reply replied 2 years ago
yes
Jeep Mechanic: Tim Mohr, ASE MASTER TECH replied 2 years ago
what is the actual fuel pressure?
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Customer reply replied 2 years ago
5 psi
Jeep Mechanic: Tim Mohr, ASE MASTER TECH replied 2 years ago
and plenty of flow to the carburator?
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Customer reply replied 2 years ago
After it starts this the problem I don't know but it will run good for maybe two hours or so and then it start acting up. It run good all the way to Cedar City . !90 miles from me then it started acting up..
Jeep Mechanic: Tim Mohr, ASE MASTER TECH replied 2 years ago
so when its acting up, it will start and idle, but hen you push the pedal, it starts to chug and die?
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Customer reply replied 2 years ago
Yes that is correct
Jeep Mechanic: Tim Mohr, ASE MASTER TECH replied 2 years ago
and what have you done so far?
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Customer reply replied 2 years ago
changed fuel filter, fuel pump and carb
Jeep Mechanic: Tim Mohr, ASE MASTER TECH replied 2 years ago
ok, it sounds like its vapor locking, if you let it cool down, does it start and run good again?
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Customer reply replied 2 years ago
yes we are getting their
Jeep Mechanic: Tim Mohr, ASE MASTER TECH replied 2 years ago
ok, then its vapor locking, and vapor locking is caused by either a bad fuel pump, which you have ruled out, or one of the lines from the pump to the tank is too close to the exhaust, and is heating up, or too much ethenol in the fuel, have you checked the lines from the pump to the tank, and seen if one is too close to the exhaust?
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Customer reply replied 2 years ago
They are running down the left side from factory and across the front of the motor and are about a foot or so from the exhaust. The line from the pump is a rubber hose across the valve cover to the carb
Jeep Mechanic: Tim Mohr, ASE MASTER TECH replied 2 years ago
ok, has this only occured with the same tank of fuel?
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Customer reply replied 2 years ago
No. It does not matter what fuel I use. Have even changed the octane rating of fuel. No help there.
Jeep Mechanic: Tim Mohr, ASE MASTER TECH replied 2 years ago
then without being there, I dont know what else to try, I will open this back up to other experts and see if they have any new ideas,Tim
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Customer reply replied 2 years ago
Thanks Tim. Don't feel bad. It has got us all confused. Maybe a stick of dynamite will help.
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