Does 1989 cherokee xj have a fuel pump fuse? - JeepForum.com
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Unread 09-10-2010, 07:38 PM   #1
bigislandhikers
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1989 XJ Cherokee 
 
Join Date: Jun 2010
Location: Michigan
Posts: 141
Does 1989 cherokee xj have a fuel pump fuse?

Relay seems to be ok. While changing filter verified that the pump doesn't work. Before changing out the pump I want to make sure there are no fuses that could be bad.

Thanks

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Unread 09-10-2010, 08:08 PM   #2
CKUPQ
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sounds like your ballast resistor died. I can't remember where its at but its a little chunk of porcelain on the fender that is inline with the relay.
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Unread 09-11-2010, 10:07 AM   #3
bigislandhikers
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Would the ballist resister effect the fuel pump? Isn't the pump 12v?

Mine is cracked, but it has been since I bought the jeep. Wasn't sure what it was for.

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BIH
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Unread 09-11-2010, 01:40 PM   #4
CKUPQ
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The ballast resistor is in-line with the pump. Its sole reason is to keep the pump "quieter". If you by-pass it you'll actually be doing yourself a favor because the pump will then be seeing 12V instead of 10 or 11V


Cliff notes: Remove it, it won't hurt your pump.
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99 XJ 3" Rusty's coils DT3000 front shocks, 3" S-10 bastard back, Homemade T-case drop, recovery points front and rear.
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Unread 09-11-2010, 03:01 PM   #5
bigislandhikers
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I have the old pump out. Can I hook it up to the battery to see it it works before I install the new one. If so which wire on the pump goes to positive and negative.

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BIH
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Unread 09-11-2010, 03:30 PM   #6
cruiser54
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You can, but remember what sparks and gasoline can do when combined. Check your ballast resistor for continuity while you're at it.
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Unread 09-12-2010, 12:20 AM   #7
compfreak530
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1988 XJ Cherokee 
 
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The ballast resistor is bypassed during first ignition.. so if the pump isnt comming on even during cranking its probly a bad pump. with the pump in hand just apply power to the two terminals. try both ways. wont hurt. if pump dosent come on then its bad. the ballast resistor is there to prolong the life of the pump by lowering the voltage to it. it dosent need to be at full power to supply more then enough juice to the engine.
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