Fuel problem
#1
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Year: 2000
Engine: 4.0 I6
Fuel problem
Okay well there is a problem with the fuel pressure in my 00 cherokee
Symptoms:
takes 2 cranks to start
backfires - causes vacuum line to come off
misfires on random cylinders
The pressure to the fuel when the vehicle is off and on run is about 6 psi but when it is running it is 49 psi
what are potential causes?
-thanks
edit: The engine misfires whenever it is started... i need to rev it in order for it to not misfire.
Symptoms:
takes 2 cranks to start
backfires - causes vacuum line to come off
misfires on random cylinders
The pressure to the fuel when the vehicle is off and on run is about 6 psi but when it is running it is 49 psi
what are potential causes?
-thanks
edit: The engine misfires whenever it is started... i need to rev it in order for it to not misfire.
Last edited by Juh Juh Jinx; 11-16-2012 at 05:24 PM.
#2
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Year: 2001
Model: Cherokee
Engine: 4.0
Originally Posted by Juh Juh Jinx
Okay well there is a problem with the fuel pressure in my 00 cherokee
Symptoms:
takes 2 cranks to start
backfires
misfires on random cylinders
causes vacuum line to come off
The pressure to the fuel when the vehicle is off and on run is about 6 psi but when it is running it is 49 psi
what are potential causes?
-thanks
Symptoms:
takes 2 cranks to start
backfires
misfires on random cylinders
causes vacuum line to come off
The pressure to the fuel when the vehicle is off and on run is about 6 psi but when it is running it is 49 psi
what are potential causes?
-thanks
#3
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Year: 2000
Engine: 4.0 I6
Dude i just had the same problem and it turned out to be my fuel pressure regulator and its located on top of the fuel tank i got a 01 so yours should be in the same place and to check if yours is bad put a fuel gauge on it start it up let it run for a few minutes and shut it off and if the gauge dont hold pressure its the regulator and if it dose its the pump either way the both suck to change. Good luck on your problem.
#4
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Year: 1999
Model: Cherokee
Engine: 4.0
Okay well there is a problem with the fuel pressure in my 00 cherokee
Symptoms:
takes 2 cranks to start
backfires
misfires on random cylinders
causes vacuum line to come off
The pressure to the fuel when the vehicle is off and on run is about 6 psi but when it is running it is 49 psi
what are potential causes?
-thanks
Symptoms:
takes 2 cranks to start
backfires
misfires on random cylinders
causes vacuum line to come off
The pressure to the fuel when the vehicle is off and on run is about 6 psi but when it is running it is 49 psi
what are potential causes?
-thanks
49 psi with engine running is good.
Multiple cranks to get the engine to run is a sign that the fuel pressure in the rail has dissipated (see above). You can live with this until you figure out why the pressure is dopping off rapidly (more than likely a fuel pump module check valve).
The backfiring is telling you your too lean... fuel pressure problem? When does it backfire? Sounds like there's a fuel pump module in your near future.
"causes vacuum line to come off". What's this? Sorry, but I laughed at this.
Do you have a CHECK ENGINE light on? If so, is there a trouble code you can tell us about. You can go to O'reilly, Advance, or Idiotzone and they will read your code(s) with their code reader. Let us know.
#5
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Year: 2001
Model: Cherokee
Engine: 4.0
Originally Posted by Juh Juh Jinx
i will have to try it, thanks man!
#7
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Year: 2001
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Originally Posted by CCKen
Hope these aren't Airtex products.
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#9
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Year: 2000
Model: Cherokee
Engine: 98 4.0 I6
Originally Posted by jtm01xj
Why is it a bad product? Because ive had it in my jeep for well over a year and never had a problem with it
Originally Posted by freegdr
Im running one also mine came as a assembly from Napa around 100 bucks
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