Question about 1994 Jeep Grand Cherokee

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I have a 94 grand cherokee put 2 fuel pumps in and both only lasted about 60 miles and quit workin what would be burnin them out?

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If the inside of the tank is clean and the pump is not being forced to drink garbage, the only things that can cause that is running with very low fuel, a poor ground or a breakdown of the power lead that appears as if the pump is bad but it just isn't getting sufficient voltage.
It is possible for a pump to fail if the charging system is overcharging, but generally that will cause other problems as well. Running volts should never go higher than 14volts.
It's also unlikely that you have just gotten a bad batch of does not often happen but it can.
Far more often it turns out to be one of the items I mentioned, so check all those first.

Posted on Feb 02, 2010

Testimonial: "thanx for your advice and i will try what you said to check for"

  • wavslav Dec 23, 2010

    I have a 1997 Gran Cherokee Laredo with the 5.2. I have had interminably engine stops, some lagging in acceleration and finally stopped all together. However not completely, I had it start then stop just as fast as it would start. Checked the relay and removed the CPS and then she started up again. Well it died a few days later on the same route in the exact same (within a meter) of where it did before. Well then I though water settled in the tank at night and thats the distance it takes for the tank fuel to pass the fuel line to the motor.
    Well I am in the process of rebuilding the fuel pump. I discovered during dis assembly some problems. 1. the tank and the filters were full of red corrosion or dirt. 2. The most troubling.... the red/positive lead connecting to the actual fuel pump module inside the tank was more than 3/4 broken. When I pulled on the lead it broke completely. Upon inspection of the break their was only a slight part of shiny fresh metal where the copper clip separated showing that only a tiny portion of the clip was actually connected. to the slide portion of the connection. Now this is where the positive lead gets crimped in the slide connector on top of the actual fuel pump module in the gas tank. This along with the dirty tank may have been my problem ( I am just now reassembling). Does anyone know if this connector separated entirely and then touched again could cause a spark and ignite the gas tank????
    It appears the lead was forced with too much pressure into the retaining clip plastic housing and tore a section of the neck of the copper crimp.
    I am reassembling tomorrow as it appears that the pump may not have been getting the amperage needed to operate. If that does not do the trick I will try a new pump and check the regulator. Its old but in great condition, love it for the price, hate it for the economy. If I knew how bad it really was I would have bought another Rover. Like my grand wagoneer, never miss a gas station, 1 year over 10,000 in gas, yes I drove a lot.

  • Richard Scordino Dec 24, 2010

    Never heard of any exploding but sparking inside a tank is definitely not a good thing. I have heard that an anti corrosion coating on the inside of some tanks breaks down and causes contamination. As far as economy from a GC, I had the identical engine in an 87 fifth ave and used to get 23mpg average.... add the computerized stuff and injection and you'd think it would get better (thanks EPA) . No two identical engines are identical...Take away the ability to fine tune them and that's what you get. Don't worry, pretty soon we will have government mandated sails on our cars!!! (and, they will tax you for that too!!)


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Much as i hate to say this. If you are buying aftermarket fuel pumps, stay away from carter. For whatever reason they have a huge comeback rating for jeeps. They dont seem to be built to spec.

Posted on Feb 07, 2010

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Where is the fuel pump at on a 94 cherokee 5.2

Posted on Feb 03, 2010

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I think your fuel pump MAY be failing, Luther. It may also be stopping because it thinks it's pressurized the fuel enough, though. Have someone check the fuel pressure and flow rate at the fuel rail with the appropriate gauge.

If your "Check Engine" light is on, also have someone get the error codes from your Jeep's computer with an first generation OBD scan tool - there may be another issue totally unrelated to the fuel pump.

You do understand that a '94 is really getting pretty old, right? After twenty years, it owes nobody anything. The Jeep's computer may be borderline dying... and you may not be able to get another GOOD computer to replace it. After twenty years, even new-old-stock computers off the shelf are pretty unlikely to work. Your Jeep may have driven its last miles - it's sad, but they DO have a much more finite life than the older (pre-1987) vehicles.

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Recall DateMAR 04, 2004

Model Affected2004 JEEP GRAND CHEROKEE




Potential Units Affected14621


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