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Unread 01-21-2011, 07:51 AM   #1
DT5150
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1983 CJ7 
 
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CJ W/ TBI 350. Fuel Pump Location

i'm wondering if the postion of the fuel pump could cause running issues. mine spits and sputters and doesn't idle consistantly. also lacks some top end power. my fuel pump (from howell, along with the wiring harness) is mounted back by the tank, in front of it, up high. there's that thin little crossmember there where the forward edge of the fuel tank skid and the fuel tank itself bolts up. that's where it's mounted. height wise, it's about even with the top of the tank, maybe slightly above. i think i read somewhere that most guys mount theirs along the frame rail, beside the transfer case, protected by the skid plate. think my running problems could be caused by where the pump is mounted? everything else has been checked and tested, and i mean everything. i'm running out of ideas here...

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Unread 01-21-2011, 08:56 AM   #2
1986cj
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Everything I have ever read or seen has been to mount it as low as you can, even Howell's install manual says to mount is along the frame rail by the skid plate.
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Unread 01-21-2011, 10:07 AM   #3
DT5150
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it's been a while since i looked at howell's paperwork, but that's what i thought too...
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Unread 01-21-2011, 10:11 AM   #4
bajaviking
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I don't run a Howell but my pump is located on the inside of the framerail. I would get the pump down low in a well protected spot.
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Unread 01-21-2011, 10:14 AM   #5
Alby63
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The inline pumps are designed to push fuel so they can't draw it from the tank very well. They rely on the natural siphoning to prevent them from running dry, thats why they need to be as close to the tank and as low as possible. I have mine mounted to the bottom of my tank skid plate. I cut the front off an old snapper mower and made the pump it's own skid plate. Try clamping the pump to the bottom of your skid plate, extend your fuel lines and see if that cures your problem. In my pic, it's the red plate.
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Unread 01-21-2011, 11:07 AM   #6
DT5150
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interesting...
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Unread 01-21-2011, 04:28 PM   #7
Redmanchew
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Mine is mounted up on the front of the crossmember in front of the tank. I had it orginally under the xfr case skid with one of the fuel filters. when i started having starving problems i moved it back to the crossmember and have not had a problem with it since. (plus i can get to it and the filter much easier) the only other problem i had where i thought it was starving turned out to be that if you go from -6 hose (3/8") to the 5/16" fitting on the tank ( i used a clamp insted of brazing on an -an fitting) it would suck air so i had to reduce it down to the 5/16". THat and i crushed the line on top of the tank between it and a body reinforcment. When i dropped the tank you could see the flat spot in it.


Just a few ideas..
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Unread 09-24-2011, 07:44 PM   #8
TiffanysCJ5
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i have a '81 cj5 that i recently purchased... and i cannot find the fuel filter...!! i've checked all inside the frame... Nothing. Any suggestions?
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Unread 09-24-2011, 07:59 PM   #9
madjeepist
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did you look in the factory location? under the hood about 8" from the carb?
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