Question about 2004 Jeep Wrangler

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Location of fuel vapor leak detection pump 2004 jeep wrangler

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  • Jeep Master
  • 20,706 Answers

Try posting why you ask this first
my guess, dash CEL glows, driving,
guess 2, you get it scanned and it shows a DTC error you forgot to tell here, then assume its a bad part, named per above.
why?
first is to get the gas cap tight ( or new)
and then push reset on the scan tool.
then see if the undisclosed, DTC errors, goes away.
this is first. all cars 1996 to NOW.

unless building a EVAP leak down test system is fun. or easy.?? or guessing all parts in the system? why"
see TJ jeep here
posted over 300 times, read the EVAP chapter.
EVAP means in simple terms is GAS tank VENTING and Collection system. its a smog reduction system.
2003 is free to read.
http://www.morris4x4center.com/knowledge-base/index.htm?utm_source=cj#service
chapter 25 "emissions"
page 15 answers your question.

Posted on Dec 08, 2016

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Posted on Jan 02, 2017

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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


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.

Jan 20, 2015 | 2004 Jeep Wrangler

1 Answer

Code p1494 grand laredo cherokee 2001


Here is the definition.
You'll need a shop manual for the procedures.

P1494 JEEP Description The Evaporative emissions system is designed to prevent the escape of fuel vapors from the fuel system. Leaks in the system, can allow vapors to escape into the atmosphere. The leak detection system tests for EVAP system leaks and blockage.


During the self-diagnostics, the Powertrain Control Module (PCM) first checks the Leak Detection Pump (LDP) for electrical and mechanical faults. If the first checks pass, the PCM then uses the LD pump to seal the vent valve and pump air into the system to pressurize it. If a leak is present, the PCM will continue pumping the LDP to replace the air that leaks out. The PCM determines the size of the leak based on how fast/long it must pump the LDP as it tries to maintain pressure in the system.
Read more: http://engine-codes.com/p1494_jeep.html#ixzz2JDPIwqxm

Jan 27, 2013 | 2001 Jeep Grand Cherokee

1 Answer

Engine light stays on code p1494


P1494 code is a leak detection pump switch or mechanical fault, leak detection pump switch does not respond to input. The leak detection pump (if equipped) is located under the air filter housing on models through 2001. Check if the vapor and vacuum lines are securely connected to the leak detection pump or a diagonstic trouble code my be set like this. The leak detection pump switch may be bad and need replaced.

Sep 27, 2011 | 2000 Jeep Cherokee

1 Answer

I have a 2004 Jeep Wrangler. The Engine light came on. I had Auto Zone check the code for me. I don't remember the number, but they said that it was the Purge Valve. I had to buy the Purge Valve from...


Could be the P0445 - Evaporative Emission Control System Purge Control Valve Circuit Shorted
The EVAP canister purge volume control solenoid valve uses a ON/OFF duty to control the flow rate of fuel vapor from the EVAP canister. The EVAP canister purge volume control solenoid valve is moved by ON/OFF pulses from the ECM. The longer the ON pulse, the greater the amount of fuel vapor that will flow through the valve.

Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)

Possible causes
- Damage harness or connectors to the Purge Control Valve
- The valve circuit is open or shorted
- EVAP canister purge volume control solenoid valve may be faulty

When is the code detected?
- An excessively high voltage signal is sent to ECM through the valve

Try to remember this code number for additional details. Hope this helps, keep us updated.

May 31, 2011 | 2004 Jeep Wrangler

1 Answer

I have 2004 Jeep TJ with 4.0L and have a P1494 code and it's taking more fuel than usual. What is the problem with it


vacuum leak. you should have a leak detection pump. locate this in the rear and check hoses. sometimes the hoses split on jeeps. easy cheap fix if you can find it.

Jan 10, 2011 | Jeep TJ Cars & Trucks

2 Answers

Problem filling gas tank 98 jeep wrangler, nozzle keeps clicking off


It's very possible that your fuel tank vent hose is bloked or kinked.

Apr 15, 2010 | 1998 Jeep Wrangler

1 Answer

Fuel Odor on a 1998 Jeep Grand Cherokee


The evap system ( fuel vapor recovery system ) , if there is a leaky hose, can let fumes out that can be detected in the cab. If you "top off" the fuel at the pump you can spill fuel into the charcoal canister meant for fuel vapors only. the vapor recovery system is behind the left rear tire.

Usually if there is a hose leak a check engine light will come on.

If you TOP OFF, don't. If you don't, good. Hope this helps.

Apr 02, 2009 | 1998 Jeep Grand Cherokee

1 Answer

Check engine light code PO456


most likely the pressure sensor in the fuel tank for the evap system is defective.

Feb 25, 2009 | 2004 Jeep Wrangler

1 Answer

2004 Jeep Wrangler Solenoid


THE SOLINOID VALVE IS ONLY PART OF THE SYSTEM YOU MAY HAVE A LDP (LEAK DETECTION PUMP) PROBLEM INTERNAL LEAKS ARE HARD TO DIAG YOU MAY WANT TO BRING TO A DEALER.

Nov 26, 2008 | 2004 Jeep Wrangler

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