New fuel pump or what - JeepForum.com
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post #1 of 17 Old 07-24-2010, 10:09 AM Thread Starter
turkeybuzzard
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New fuel pump or what

My fuel pump looses its prime after sitting a few hours. I have no pressure at the fuel rail. Will I have to replace the pump or is there a valve that can be replaced instead? I know I will have to drop the tank to fix the pump and I am dreading it. This is on my 97 tj. Is an after market pump ok?

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post #2 of 17 Old 07-24-2010, 11:06 AM
TheBoogieman
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Quote:
Originally Posted by turkeybuzzard View Post
My fuel pump looses its prime after sitting a few hours.
Explain what you mean by that.Dropping the tank isn't that bad.
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post #3 of 17 Old 07-24-2010, 11:33 AM Thread Starter
turkeybuzzard
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Little or no pressure in the fuel rail. Hard starts.
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post #4 of 17 Old 07-24-2010, 11:36 AM
TheBoogieman
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Have you tried the turn the key on for 30 seconds or so trick to see if it starts quicker?
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post #5 of 17 Old 07-24-2010, 12:15 PM Thread Starter
turkeybuzzard
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Yes if you turn the key four times and wait some it will crank faster. I just got my tank down and am looking at my pump.
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post #6 of 17 Old 07-24-2010, 12:18 PM
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I think he means starts quicker!Leaving the key of for a few seconds before trying to start allows fuel pressure to build up in the rail.
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post #7 of 17 Old 07-24-2010, 12:55 PM Thread Starter
turkeybuzzard
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When I turn key on I hear the pump humm, turn key off and turn key back on again hear the pump humm. If I do this 2 more times yes it will start quicker. Has been like this since I had it. If I just try and crank it you wind on it for then let off and then you wind on it some more and it will finally crank up.
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post #8 of 17 Old 07-24-2010, 12:56 PM
Jonny Jeep
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You can replace the combined fuel filter/regulator on top of the tank, held in place with a metal clip. The regulator is supposed to hold pressure when the engine is not running. I replaced mine several years ago because of a long crank problem.

From $45 on ebay...


5210053 Pressure Regulator SMP # PR318 AIRTEX # 5G1211: eBay Motors (item 360271876015 end time Aug-11-10 12:05:57 PDT)

http://cgi.ebay.ca/JEEP-CHEROKEE-G-CHEROKEE-WRANGLER-FUEL-FILTER-REGULATOR-/370377727383

Online factory service manuals and parts lists - http://www.jeep4x4center.com/knowledge-base/index.htm
If it doesn't work properly, look for the service manual link at the bottom of the page.
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post #9 of 17 Old 07-24-2010, 01:23 PM Thread Starter
turkeybuzzard
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I don't have time to get the regulator, got it tore down now. Thanks. How can I tell what size tank I have? They make 1 for 15 gallon and 1 for 19?
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post #10 of 17 Old 07-24-2010, 01:24 PM
cntryboy97
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how difficult is the regulator replacement (the one shown on the ebay link)? I also have the long crank problem and I wonder if I should replace the fuel pump & the regulator. Thanks

97 Wrangler Sport 4.0L.
3" BDS Lift, 4.11 gears, Tera Disco's, Rusty's Air tube, Rusty's adj. track bars, Class III Hitch, "Generic" Hi-Lift, 33 MT's on 8" black wheels, CB, etc. etc. etc
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post #11 of 17 Old 07-24-2010, 01:32 PM
Jerry Bransford
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The fuel pressure regulator is the usual cause of slow starts after the TJ has been sitting for a while. It has a check valve inside that is there to prevent the fuel from draining back down out of the fuel rail that the fuel injectors are seated into. When the check valve fails or starts leaking, it allows the fuel to drain down from the fuel rail and back into the tank instead of staying up top like it is supposed to for a fast engine start.

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post #12 of 17 Old 07-24-2010, 03:42 PM Thread Starter
turkeybuzzard
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The tank was easy to drop, a lot easier than I thought. I had a jack and one helper. I am trying to find out what size tank I have in my jeep but am having no luck.
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post #13 of 17 Old 07-24-2010, 05:30 PM
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Quote:
Originally Posted by turkeybuzzard View Post
The tank was easy to drop, a lot easier than I thought. I had a jack and one helper. I am trying to find out what size tank I have in my jeep but am having no luck.
Hav you ever ran it out? What is the most fuel you have ever put in it?
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post #14 of 17 Old 07-24-2010, 05:39 PM Thread Starter
turkeybuzzard
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Never did boy mostly drove it, I have it back and am trying to fix some things.
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post #15 of 17 Old 07-24-2010, 05:43 PM
Jerry Bransford
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I'd bet it's the 19 gallon tank since you have the 4.0L. It's my impression that only the more stripped own models, especially like without a/c and with the 2.5L engine, came with the 15 gallon.

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anti-drainback valve , fuel pressure regulator , check valve

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