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Old 03-18-2014, 09:24 AM   #1
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Clogged fuel filter

Last night when I got off of work, I started my 97. Took a good 2 to 3 seconds for it to start. Then I drove to a gas pump not even 500 feet away. As soon as I turn it off, I tried to restart the engine but it wouldn't start. So I had a tow truck guy come by and try to jump it. Connected one of those jump boxes. He said that the battery had a 13 volts (which is good he said) and the starter is fine. Then he jumps into the drivers seat, turns the key while pressing the gas. After a few pumps, my baby starts. He said that more than likely the fuel filter was clogged and if that happens again, press the gas. Would a clogged dirty filter be the problem? Is there anyway to clean it other than replacing it?*

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Old 03-18-2014, 09:35 AM   #2
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That's not from your TJ's fuel filter being clogged... that diagnosis is a knee-jerk reaction from someone who isn't really up on modern Jeeps or modern vehicles that no longer use the small easily clogged fuel filters of yesteryear. The TJ's fuel filter is positively huge, big enough that it is not likely to clog without someone having dumped a big load of dirt into the gas tank. The factory considers it to be a lifetime fuel filter.

When you say it isn't starting, is the starter motor cranking the engine but it's not starting or is the starter motor not cranking the engine at all?

Does your engine take a long time to start after sitting overnight?

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Old 03-18-2014, 10:09 AM   #3
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It was cranking but not turning over. I can post a video tomorrow after leaving it off over night.
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Old 03-18-2014, 10:46 AM   #4
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turning over and cranking are the same thing but i assume it cranks briskly but does not start at first, likely low fuel pressure due to defective check valve back in tank letting pressure drop in rail or could be a leaking injector so check rail pressure and verify pressure falls with key on then off then put a non destructive clamp on rubber portion of hose to fuel rail and see if pressure still drops with key on, then clamp, then key off if clamp stops rail pressure drop it is injector if pressure still drops it is check valve in tank
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Old 03-22-2014, 05:00 PM   #5
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Quote:
Originally Posted by Digger84 View Post
... put a non destructive clamp on rubber portion of hose to fuel rail and see if pressure still drops with key on, then clamp, then key off if clamp stops rail pressure drop it is injector if pressure still drops it is check valve in tank
Digger, can you explain where exactly to clamp this? I've got a gauge on the rail currently, and was just trying to determine how to rule out injector vs check valve. 40lbs at key on, 50lbs running, key off and it drops to 0 after 25 minutes. (I assume it should hold longer?) The 6" section of rubber just before the rail inlet seems to be a sleeve over a hard line, I fear if I clamp there it may crush?
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Old 03-22-2014, 05:38 PM   #6
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My bet is it is dropping pressure from a leaky check valve in the fuel pump assembly.
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Old 03-22-2014, 05:49 PM   #7
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I'm leaning towards the same, but if there's a simple way to rule out one or the other before dropping the tank, I'd love to try it.
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Old 03-22-2014, 05:56 PM   #8
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I've had enough of them that I wouldn't bother chasing it any further, I'd replace the fuel pump. Over the past 17 years, I've installed 5-6 fuel pumps for the same reason which is very common. I just replaced the fuel pump on my '04 for the second time last week after the original Spectra Premium I installed 3.5 years ago failed with the same issue. I used a good quality Bosch fuel pump this time.
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Old 03-22-2014, 05:59 PM   #9
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Definitely knew to go with Bosch, thanks. I'll start shopping soon, suggest a source?
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Old 03-22-2014, 06:19 PM   #10
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Definitely knew to go with Bosch, thanks. I'll start shopping soon, suggest a source?
Actually yes I do. I normally buy such items from RockAuto Parts Catalog but they were out of stock of the Bosch fuel pump. Desperate since I had a wheeling trip coming up in a week, I checked eBay & found the Bosch I needed for only $120 brand-new including "expedited" shipping from a Florida company called Herko. I ordered it Saturday morning through eBay & then sent a follow-up email directly to them begging for them to get it shipped Monday. They shipped it Monday & I actually received it Wednesday, a day ahead of when they promised it. And it was the real thing for only $120, way below even Rock Auto's price. Herko was great, they really came through for me though I was very skeptical of them before I received it.
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Old 03-22-2014, 06:30 PM   #11
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Sweet! Thanks again Jerry!
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Old 03-22-2014, 06:36 PM   #12
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I'm thinking this one would be the right model for your 2001... Brand New Bosch 67658 Fuel Pump Module for Jeep Vehicles 1997 2001 | eBay
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Old 03-22-2014, 07:08 PM   #13
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I checked that one out, cross referenced with rockauto, part numbers don't jive. Rockauto says bosch 67655, you had linked a 67658, which Herko's compatability check says no-no for my '01. I haven't found the 67655 through Herko though.

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