Fuel pump fuse blowing immediately - JeepForum.com
 
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post #1 of 6 Old 01-27-2014, 04:48 PM Thread Starter
RenanMilk
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1998 XJ Cherokee 
 
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Fuel pump fuse blowing immediately

I've seen a few threads on this topic but none of them have the exact same symptoms as I.

My fuel pump fuse (#19 in the PDC) blows as soon as I plug it in, with the keys in the ON position. I tried a 20 amp fuse just to try and get home with no luck. I happen to have copper wire with me, so I tried using that instead of a fuse but my car still won't turn over. I've used copper wire before to get my car home but now it's not helping anymore. I checked the wire and plugs leading out from the pump. No corrosion or visible breaks/damage. I'm at my wit's end with this car. Any advice?

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post #2 of 6 Old 01-27-2014, 04:50 PM Thread Starter
RenanMilk
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Also, I tried inserting a fuse with the pump disconnected and the fuse still blows immediately on contact.
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post #3 of 6 Old 01-27-2014, 04:54 PM Thread Starter
RenanMilk
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Just did another test. I unplugged the fuel pump relay in the PDC and plugged in a fuse into #19 and the fuse didnn't blow.
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post #4 of 6 Old 01-27-2014, 04:57 PM Thread Starter
RenanMilk
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Swapped the A/C motor relay with the fuel pump relay since it had the same part number but #19 still blows.
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post #5 of 6 Old 01-27-2014, 07:38 PM
chris87xj
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Sounds like you may have a power wire shorting to ground between the relay and the pump.

***Chris***

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But I still wouldn't trade it for a Coupe DeVille."


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post #6 of 6 Old 01-27-2014, 07:57 PM
CrazyJeepMan92
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You Have a short to ground. Power takes the path of least resistance, and the fuse being your protection device blows when amperage is exceeded. trace the fuel pump wires looking for open copper wires. If you have a voltmeter near you (For S&G's) hook up the ammeter in series with the circuit, meaning pull the blown fuse out and put the ammeter wire pos and neg in two seperate holes. If the ammeter test wires and too thick to fit in the fuse holes use a paperclip and test off that. Doing this will give you the amperage which if exceeds the fuse rating (20A) mean short to ground. DO NOT PUT A HIGHER AMP FUSE IN! Like i said its a protection device which is protecting the fuel pump.

Trace all the wires making sure none are sliced or open. Use the volt meter again on OHMS, Disconnect battery (OHMMeter puts test with .5v so the battery will throw it off. Hook the Ohm meter up in series again and test for resistance. Remember when Resistance goes up amperage goes down and vise versa.

PM Me with any questions.

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