Fuel pump? - JeepForum.com
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post #1 of 29 Old 09-23-2017, 04:55 PM Thread Starter
tymaoaretae
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Fuel pump?

I had just put my trackbar back in this morning after replacing the bushings to solve my death wobble. That appears to be solved now, but while test driving, the Jeep suddenly just died in the middle of the road. It started right back up, but it died again every time I let it idle (so at every traffic light). I just barely made it home, and I had it running, and as long as I kept my foot on the gas and kept the rpms around 2-3K, it would keep running, but if I let it idle at all it would sputter and die. Now it won't start at all. Doesn't seem to be an electrical issue, it'll crank all day long. I notice that when I turn the key on, but don't start it, the fuel pump sounds like it's repeatedly starting and stopping, and the fuel pump relay is clicking on and off repeatedly.

Should I replace the pump, the relay, both, or neither and test something else first? There doesn't seem to be a valve on the fuel rail to check the pressure. Thoughts? Thanks.


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post #2 of 29 Old 09-23-2017, 08:58 PM Thread Starter
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And now after letting it sit for about 4 hours it started right up again and has been idling just fine for the past 20 min. I'm afraid to take it anywhere until I actually figure out and fix the problem though.

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post #3 of 29 Old 09-23-2017, 09:13 PM Thread Starter
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Quote:
Originally Posted by tymaoaretae
And now after letting it sit for about 4 hours it started right up again and has been idling just fine for the past 20 min. I'm afraid to take it anywhere until I actually figure out and fix the problem though.
Of course as soon as I say that it starts dying again. Seems like as long as I keep the rpms up it will keep running, it'll stumble every so often but it won't die. If I let it idle it dies almost immediately. No codes, no rough running, but something's cutting out.

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post #4 of 29 Old 09-23-2017, 10:34 PM
sdjp
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For the starting issue you may want to check and replace your neutral safety switch and crankshaft position sensor. I had intermittent starting issues and these were the culprit.

I'm having the keeping it running issue myself; same as you I have to keep the rpm's up to keep it alive. For me I'm also having dead battery problems even know the battery is only a few months old and I keep it on a tender when I travel. I only have a winch and LED lights hooked up to it but will check for parasitic draw. Interested to see what you find.
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post #5 of 29 Old 09-25-2017, 11:23 AM Thread Starter
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Well I've gone ahead and just ordered every sensor, new fuel pump, new relays, new IAC valve, new NSS, etc. Every possible thing it could be. Going to just start replacing one at a time until it works and keep the rest as spares. I'll probably start with the crank position sensor. It sounds from what I've read and experienced that that is the most likely culprit, but in case it's not, I don't want to wait for parts to arrive one at a time.

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post #6 of 29 Old 09-25-2017, 11:42 AM
Jeeples
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There is a Schrader valve on the passenger side fuel rail, it's a bit buried but you can reach it with the fuel pressure tester that's available for rent from AutoZone, which is the tester I used when diagnosing the failed fuel pump in my wife's '03 4.7 a little while back.

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Quote:
Originally Posted by wjjeep19 View Post
It is what Jeeples has *PARTIALLY* stated.
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post #7 of 29 Old 09-25-2017, 11:44 AM
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Check all your connections at the battery, PDC, etc, and have the battery load tested. Every Chrysler I've had has done that when the voltage gets too low during starting.

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post #8 of 29 Old 09-25-2017, 11:58 AM Thread Starter
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Quote:
Originally Posted by Jeeples
There is a Schrader valve on the passenger side fuel rail, it's a bit buried but you can reach it with the fuel pressure tester that's available for rent from AutoZone, which is the tester I used when diagnosing the failed fuel pump in my wife's '03 4.7 a little while back.
Thanks, I expected to find one but I looked all around the fuel rail on both sides and didn't see one. I'll take another look at the passenger side tonight.

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post #9 of 29 Old 09-25-2017, 12:07 PM Thread Starter
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Quote:
Originally Posted by festerw
Check all your connections at the battery, PDC, etc, and have the battery load tested. Every Chrysler I've had has done that when the voltage gets too low during starting.
It's possible I guess, but doesn't seem likely. My battery/starter/alternator/ground cables are all relatively new and 0 gauge, with all new terminals. My starter and alternator are also relatively new. I'd rule it out entirely except that the battery is the oldest component in that loop, so perhaps it is starting to go, though I would imagine it would have trouble turning over and eventually give up like a weak battery usually does. It doesn't seem to have any trouble spinning the engine and the voltage looks fine on a multimeter. I guess I might as well bring it in to get load tested. Thanks.

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post #10 of 29 Old 09-25-2017, 12:52 PM
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In my experience with the crankshaft position sensor, it will completely "kill" the jeep. It'll crank and crank and crank, but will not start.

2004 WJ Laredo, 4.0, 197,xxx miles and counting, 3:55 gears, D30/D35c. Stock for now
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post #11 of 29 Old 09-25-2017, 01:17 PM Thread Starter
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Quote:
Originally Posted by RoysJeep
In my experience with the crankshaft position sensor, it will completely "kill" the jeep. It'll crank and crank and crank, but will not start.
That seems to be what eventually happens once the engine warms up. It'll start again after it cools down and then once it warms up again it'll start dying and then fail to start at all. Let it cool down and then it'll start again and run fine until it warms up.
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post #12 of 29 Old 09-25-2017, 02:23 PM
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Quote:
Originally Posted by tymaoaretae View Post
That seems to be what eventually happens once the engine warms up. It'll start again after it cools down and then once it warms up again it'll start dying and then fail to start at all. Let it cool down and then it'll start again and run fine until it warms up.
I pretty much had the opposite issue. Drove to work completely fine, and came out after work to a WJ that wouldn't start. I literally had my jeep for a month when the crankshaft position sensor failed.
However, I'd would replace it for peace of mind. Not sure where its located on the 4.7 but on the 4.0, its on the back of the motor, on top of the bell housing.

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post #13 of 29 Old 09-25-2017, 02:28 PM Thread Starter
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Quote:
Originally Posted by RoysJeep
I pretty much had the opposite issue. Drove to work completely fine, and came out after work to a WJ that wouldn't start. I literally had my jeep for a month when the crankshaft position sensor failed. However, I'd would replace it for peace of mind. Not sure where its located on the 4.7 but on the 4.0, its on the back of the motor, on top of the bell housing.
It's just above the starter on the 4.7, and I have a replacement on the way. My working theory is that my sensor works until it warms up and then it starts flaking out.

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post #14 of 29 Old 09-25-2017, 07:21 PM
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I do hope the changing of your crankshaft position sensor goes a whole lot better than mine did. I did eventually get it out after 3 days
Of torture. Let us know how it goes.
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post #15 of 29 Old 10-05-2017, 09:17 PM Thread Starter
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Quote:
Originally Posted by Rattit00d
I do hope the changing of your crankshaft position sensor goes a whole lot better than mine did. I did eventually get it out after 3 days Of torture. Let us know how it goes.
Took me 5 days, and it didn't solve the problem.

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