Question about 2004 Jeep Wrangler

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On a 2004 Jeep Wrangler 4.0 it take about 30 sec to start I put a fuel gauge and it takes a while for the fuel to reach 45 psi I have to cycle the key on n off about 4 times then it will start after i

2004 Jeep Wrangler I can find a furl filter could it be inside the tank

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Is this a double post, i just posted a huge full answer
just a while ago, on gc.
for same pressure..
the pump check balls bad,or fuelpumpreg inside.
or the injectors leak
last poster too, said awhile, 1s, 1min, 1hr what is while>
spec. is 1/2 min leak down or longer.
so>? but keyon 4 times, is fail

unplug injectors, (elect) is pressure 49 +-5 psi? and holds.
now, bingo.
leak down fails now.
yes the filers are all in tank
yes, the injectors can leak

un connect fuel rail hose, to rail block it.
hold pressure now
yes, bad leaking injector
no,, pump assy bad. assembly, why takes bench tests.

Posted on Jan 21, 2015

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Bad fuel pump

Posted on Jan 21, 2015

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Posted on Jan 02, 2017

short shadey

jeff r

  • 421 Answers

SOURCE: 1988 jeep wrangler no fuel

check your fuel pump relay and your ignition switch those numbers you gave for voltage are not right, please recheck that you have a ground and 12volts at the pump while cranking please rate -jeff

Posted on Sep 04, 2008


  • 1 Answer

SOURCE: 1996 Jeep Country Wagon. Replaced fuel filter and

My 99 Jeep Cherokee keeps shuting off when I am taking right turns. If anyone can point me in the right direction that would be awesome. I am really stumped.

Posted on Jun 23, 2009


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SOURCE: 1994 Jeep Wrangler starts fine runs for a few minutes then dies.

I'm not sure if your Jeep has this or not, but you could check with your local Chrysler dealership. Some vehicles have a sock filter in the gas tank to filter any debris before it is delivered to the engine. What sometimes will happen is, you vehicle will start and run until debris clogs the sock filter and it will die. After the vacuum on the fuel line is gone the debris will fall free from the sock filter back to the bottom of the gas tank. Then when you restart the vehicle it picks up the debris again and clogs you filter again. This happen to me once and I have to remove the tank and clean the debris out and install a new sock filter. Good luck.

Posted on Jun 23, 2009


  • 1 Answer

SOURCE: 2007 Jeep Wrangler x will not start. put new fuel pump but still

2003 4.0 lt jeep rubicon hit a big bump and it stalled cranks over fine but not firing checked all fuses, ok. fuel pump not on , connect direct and it works but not with key. starts for couple secs. when put fuel in throd body. any idea why not starting?

Posted on Aug 04, 2009


Justin Case

  • 1498 Answers

SOURCE: 1991 Jeep Fuel Control Issue

Hey Mudkicker,

Who ever thought of putting an electric fuel pump inside a tank of gas........

Check your other gauges for accuracy. They do that when a ground is loose.

Check the wiring from the fuel tank along the longitudinal frame for frays and shorts. Plugs are secured.

Under the hood, passenger side, check the fuel pump relay. Switch it with one of the others to test it.

Bring the vehicle to an auto parts store. Ask them to break out he code reader. Check for diag codes

Comment me back

Posted on Aug 26, 2009

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1 Answer

95 jeep wrangler 2.5L fi.very long crank time before engine starts.this system requires rpm signal before it will power up fuel pump.

Key on engine off , what is the fuel pressure ? When you turn the key to the on position ( not start ) the PCM will turn the fuel pump on for two or three seconds for system prim , then it needs a RPM signal (engine cranking) . In side the fuel pump module is a check valve that keeps pressure in the fuel lines , if weak will allow fuel to drain back to the fuel tank . This will cause long crank times . Put a fuel pressure gauge on the vehicle an see what the pressure is key on , does it come up to 40 psi ?

Oct 06, 2016 | Jeep Cars & Trucks

2 Answers

On a 2004 Jeep Wrangler 4.0 it take about 30 sec to start I put a fuel gauge and it takes a while for the fuel to reach 45 psi I have to cycle the key on n off about 4 times then it will start after i

a while? 1sec, 1min 1hr?

filter, packed,
where is gage sensor on rail.?
ever get a full tune up?:
the fsm is free here.
tj unlimited?
2 systems dead head or loop and is key to diagnosis.
looking now.,
49.2psi is spec, +-5 page 2 (so pump is good) but?/...
it is loop but no fuel pump reg at rail.
that is rail pressure not anywhere else.
at 44 you key off the pressure must hold for 1/2 min. or you fail
leak down test, (injector leaks or check ball in pump)
if the check ball fails it will take many key on to get full pressure
2 or 3 second pump runs, each key:?
see why?> unplug injectors see if leak down passes/?
all filters and socks in take, below pump

so it fails leakdown
the only way to find this is to block rail input. line,
if it still leaks tank drops
if it stops the injectors leak (for all those reasons)

the tank regulator has its own loop return feed back
so the rail really is a dead head, with one line there.

Jan 20, 2015 | Jeep Cars & Trucks

1 Answer

I have a 1998 jeep wrangler sport and it is having starting problems. i usually have to crank, release, then crank again to get it to start. it always ends up starting, but it takes a few tries. it occurs...

You can mount a fuel pressure guage to the engine fuel rail at its bicycle valve bleeder, with tof see if it has pressure when you first turn on the key to start. You may be able to hear the fuel pump running by listening at the fuel tank fill cap that you would remove for that moment. By turning on ignition to start, not run, you are energizing the fuel pump to bring up pressure that should happen in several seconds. So, check if it gets to normal fuel starting pressure, maybe 45 to 60 psi. Then turn key all the way to run, to get car engine running and watch the fuel pressure to see if it stays pretty constant at that 45 to 60 psi. Turn engine off, and watch how long it takes for fuel pressure to drop, and it should not happen fast but instead over 15 minutes or more. That might indicate your fuel regulator valve isn;t working right.
Is it possible your starting system is the culprit, say some battery cable loose that may make starting hard or eventually quit until you tighten these cable ends at battery and starter.

Aug 03, 2017 | 1998 Jeep Wrangler

1 Answer

Jeep wont start on first turn of key, will start on second turn.

this is jeep the check valve in the fuel pump will not hold presser and sometimes you have to cycle the key to pump up the pressure to start

Jan 05, 2011 | 2004 Jeep Wrangler

1 Answer

What should the fuel pressure be for a 2003 jeep wrangler

1. Connect fuel pressue gauge, start engine
2. Observe test gauge. Normal operating pressure should be 339kPa+/- 34 kPa (49.2 psi +/- 5 psi
3. Turn vehicle off.
4. Pressure should not fall below 30 psi for 5 minutes

i have these directions plus more about if want in pdf format, need email address to send if want

Feb 04, 2010 | 2003 Jeep Wrangler

1 Answer

Oil pressure gauge goes up when car started, but then down to 0

u Have a problem with the oil sending unit. The sensor is located beack right side of the engine block. Take out the switch and make sure u have good oil PSI. Should be 6 psi at idle and around 50 at 4000 RPM. If the presure is ok replace the switch they are very cheap about 20 bucks. Please rate.

Aug 10, 2009 | 1998 Jeep Wrangler

2 Answers

2007 Jeep Wrangler x will not start. put new fuel pump but still will not start. Feul pump does not kick on when key turns>???

check to see if their is any fuses blown or change out the fuel pump relay and also check to see if the ground to the fuel pump is getting a good connection these things should solve your problem.Good luck

Jun 23, 2009 | 2003 Jeep Wrangler

1 Answer

1998 wrangler efi system

FUEL PUMP WILL PUT PRESSURE IN FUEL RAIL FOR YOU. sounds like fuel pressure in the fuel rail is losing pressure usally caused from fuel pump starting to go out. check pressure with fuel gauge. screw it onto the fuel rail connection turn the key forward (do not start ) then turn key off presure should hold around 16 psi. if the gauge starts to drift back down then the fuel pump is going to go out ( sometime)

Sep 03, 2008 | 1998 Jeep Wrangler

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