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Chris
Chris, Shop Foreman
Category: Jeep
Satisfied Customers: 3172
Experience:  Jeep Certified Master Tech
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Yj: checked everything. Jeep 4.2 . Fuel seems to be vaporizing

Customer Question

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: 1 year ago.
Category: Jeep
Expert:  Tim Mohr replied 1 year ago.
Hi, y name is ***** ***** you checked the fuel pressure yet?
Customer: replied 1 year ago.
yes
Expert:  Tim Mohr replied 1 year ago.
what is the actual fuel pressure?
Customer: replied 1 year ago.
5 psi
Expert:  Tim Mohr replied 1 year ago.
and plenty of flow to the carburator?
Customer: replied 1 year 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..
Expert:  Tim Mohr replied 1 year ago.
so when its acting up, it will start and idle, but hen you push the pedal, it starts to chug and die?
Customer: replied 1 year ago.
Yes that is correct
Expert:  Tim Mohr replied 1 year ago.
and what have you done so far?
Customer: replied 1 year ago.
changed fuel filter, fuel pump and carb
Expert:  Tim Mohr replied 1 year ago.
ok, it sounds like its vapor locking, if you let it cool down, does it start and run good again?
Customer: replied 1 year ago.
yes we are getting their
Expert:  Tim Mohr replied 1 year 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?
Customer: replied 1 year 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
Expert:  Tim Mohr replied 1 year ago.
ok, has this only occured with the same tank of fuel?
Customer: replied 1 year ago.
No. It does not matter what fuel I use. Have even changed the octane rating of fuel. No help there.
Expert:  Tim Mohr replied 1 year 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
Customer: replied 1 year ago.
Thanks Tim. Don't feel bad. It has got us all confused. Maybe a stick of dynamite will help.

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