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Unread 06-21-2015, 10:39 PM   #1
TestBedOne
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Fuel Filter

I'm finally getting to replacing the fuel filter which was very much original to my 92' YJ (154,000 Miles). I got a Crown fuel filter and noticed it had no markings about which side went to the engine. Does it matter which side faces which way? How do I know its facing the correct direction?
I

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Unread 06-22-2015, 01:07 AM   #2
ZombiePopper
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If there's no markings then there's a good chance it won't matter. Some are a one-way only and some don't matter.
1 way is to slap it on and if you're not getting fuel then flip it over.
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Unread 06-22-2015, 03:03 AM   #3
Drednot
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Actually, it does matter.
While it will work either way, it is designed to flow from the outside of the filter to the inside just like an oil filter.
It gives a functionally larger surface area to catch the sediment and last longer before clogging up.


Is one side bigger than the other? That's usually the inlet.
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Unread 06-22-2015, 07:35 AM   #4
mike134
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I agree with drednot. And I think it is supposed to be marked. Align the crimping on the can in the same direction as the arrow above.

Glad you're changing your filter! this can really save you a lot of fuel pump trouble...
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Unread 06-23-2015, 05:37 AM   #5
TestBedOne
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Thanks guys! I took it back off and sure enough I had it facing the wrong way. But now I know how to put it on if its not labeled by checking the nozzle sizes. Now I should be getting nicely filtered fuel into the 4.0L, I need that baby to last!
Thank you!

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Unread 06-23-2015, 07:13 AM   #6
mike134
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awesome, thanks for posting the solution!

That old oil filter is pretty disgusting on the outside. I wonder how it looks inside. you might be able to feel the difference at high rpm!
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Unread 06-23-2015, 07:19 AM   #7
TestBedOne
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Quote:
Originally Posted by mike134
awesome, thanks for posting the solution! That old oil filter is pretty disgusting on the outside. I wonder how it looks inside. you might be able to feel the difference at high rpm!
I still have the old filter kicking around. Want me to open it up and see?
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Unread 06-23-2015, 10:45 AM   #8
mike134
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hah. I'd be very curious! The original filter and hoses were not meant for ethanol. I wonder if that has any effect. I bet the hoses were eaten away and you'll find a lot of hose material in there.
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Unread 06-23-2015, 12:04 PM   #9
Drednot
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Quote:
Originally Posted by TestBedOne View Post

I still have the old filter kicking around. Want me to open it up and see?
Yes. I always cut my filters open to see what they caught.
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Unread 06-23-2015, 02:56 PM   #10
ZombiePopper
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Well,
Ya learn something new everyday!
I've used unmarked universal fuel filters (same size inlet/outlet) thrown on anyway and never had an issue/problem before,
Go figure.
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Unread 06-23-2015, 07:57 PM   #11
JrTjK
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good post. Are you sure the filter wasn't marked? I've yet to see a Crown one that didn't say Inlet or Outlet on them by the nozzles, faint, but usually there.
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Unread 06-23-2015, 08:21 PM   #12
mike134
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Quote:
Originally Posted by JrTjK View Post
good post. Are you sure the filter wasn't marked? I've yet to see a Crown one that didn't say Inlet or Outlet on them by the nozzles, faint, but usually there.
I thought the crowns were black... this one is blue... was it form a reputable source?
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Unread 06-23-2015, 08:50 PM   #13
reeveskd
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This is like science class: I would also be VERY interested to see the inside of a recently-cut-open filter. The more the better; it's like some kinda X-Files thing. So kool.
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Unread 06-24-2015, 01:01 AM   #14
DirtKar
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It's kinda hard to tell from the pic, is that your frame that looks like it is rusted away to nothing?
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Unread 06-24-2015, 03:16 AM   #15
Drednot
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Quote:
Originally Posted by reeveskd View Post
This is like science class: I would also be VERY interested to see the inside of a recently-cut-open filter. The more the better; it's like some kinda X-Files thing. So kool.
Couple other cut a ways
90 XJ fuel pump
Pump rollers
89 trooper injector
74 CJ coil
dscn6192.jpg   dscn6195.jpg   dscn9668.jpg  
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