Cost To Replace A Fuel Pump on a 1999 Cherokee? -
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post #1 of 6 Old 04-18-2011, 09:40 PM Thread Starter
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Cost To Replace A Fuel Pump on a 1999 Cherokee?

My jeep specialist is asking for around $800 to replace my faulty fuel pump.

The cost is around $350 for an OEM (Chrysler) fuel pump, plus labor.

Does that sound too high? He's recommending that I just live with the slow cranking until it gets really bad. However at some point its going to be replaced, so I wanted to know what I can expect to pay.

Any ideas?


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post #2 of 6 Old 04-18-2011, 10:49 PM
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Cost me $100 (Autozone part) and couple of hours (free). You sure it's your pump? Can also be the fuel filter that's clogged up, a bad relay... Cheap stuff first.
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post #3 of 6 Old 04-18-2011, 10:57 PM
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What do you mean by "slow cranking"? Does it crank OK and just takes time to fire, or does it turn over slowly?

You can get the pump and filters off Ebay for like $110 for the Bosch pump. It is easy to drop the tank and install the pump/filters if you have any mechanical ability - if the gas tank is under 1/8th full you could probably drop the tank without syphoning , replace the filter and pump, and reinstall in about 2 hours...3 hours if you go slow.
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post #4 of 6 Old 04-19-2011, 05:49 AM
It's the crank sensor!
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Is your problem the "extended crank time" explained below? If so, then yes....your mechanic is correct in that you can perform the "poor mans prime" every time before you start it if you want. That will speed up your start time and make for less stress on your starter.

The check valve problem is VERY common and failure of that valve, does NOT mean that the actual fuel pump is failing. The problem is so common that I have the below information in a "cut and paste" document and pull it out whenever there is a thread that involves this.

If you are going to replace it, I always order Bosch fuel pumps as they are very high quality with the lowest return rate. About $300 for this assembly for yours. The OEM Jeep pump should be fine as well. For a 1999, the fuel pump assembly is one unit that contains the pump, regulator, filter, sending unit. As mentioned, gas tank has to be removed to replace this.

The check valve is located on top of the gas tank and is part of the fuel pump assembly on 95.5-2001 vintage 4.0 XJs. When the check valve starts to fail, it reduces fuel pressure to a point where an extended crank is needed to start the engine. It is a very common failure. I experienced it on my 99 at around 75K.

A good (and simple) way to troubleshoot this problem is called “the poor mans prime”

1. Turn key to ON position (do not crank the engine!)
2. The fuel pump will energize and run for a couple of seconds
3. Turn key to OFF position
4. Repeat above a two more times
5. NOW crank the engine over

If the engine starts quickly and cleanly after performing this procedure, you may have the check valve issue. If it starts and runs poorly for a few seconds, it could also be a leaky fuel injector resulting in the bleed down and the stumble upon startup is the engine clearing the excess fuel that has leaked into the cylinder because of the faulty injector.

Also be aware that a bad battery can give you this symptom. Sounds strange but it definitely does happen. Have battery load tested if you have any questions; your XJ does NOT like low available battery voltage. Be sure battery connections and posts are CLEAN.

Some troubleshooting tips for extended crank times:

Hook up fuel pressure gauge on the schrader valve on the fuel rail

Start engine and bring to normal operating temperature.

Observe test gauge. Normal operating pressure should be 49.2 psi (plus or minus 5 psi)

Shut engine off.

Pressure should not fall below 30 psi for five minutes.

If pressure falls below 30 psi, it must be determined if a fuel injector, the check valve within the
fuel pump module, or a fuel tube/line is leaking. An adaptor tool/hose included with the fuel pressure gauge can help you with this. Consult gauge manual for more information on this but here is basically how it works:

*Turn the engine off and immediately clamp the fuel line at the adaptor hose. Watch the pressure gauge and see how long it takes to lose pressure.

*If the pressure remains at 49 psi for an extended period of time then the problem is in the tank - possibly the check valve. If the pressure falls below 49 psi fairly rapidly then the problem is probably a leaky fuel injector.

You can limp a check valve problem along indefinitely if you wish as it doesn't mean the fuel pump itself is going bad. Normally, the check valve is replaced as an entire assembly as you have to drop the gas tank to access the assembly. Fuel pump assembly consists of fuel pump, regulator, check valve, filter. If you do replace the fuel pump assembly, purchase a high quality OEM style unit. Some cheap aftermarket assemblies don’t hold up and fail prematurely. I specifically seek out Bosch fuel pumps as they are the best in the business. Stay away from Airtex, as IMHO, they have a bigtime reliability problem.

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post #5 of 6 Old 04-19-2011, 07:09 AM
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You could also lift up the carpet and cut a small access panel in the cargo area. Then when you're done, silicone the piece of metal back down and lay the carpet back over it. That way you won't have to drop the tank.

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post #6 of 6 Old 04-19-2011, 07:48 AM
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That is a complete rip off IMO dropping the tank in a Jeep is not difficult at all and should not require that much cost in labor. I work at a shop and I just checked the Labor Guide and it calls for 1.8 hours of labor to replace the fuel pump. So unless they charge $250 an hour for labor that does not make any sense.

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