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Old 06-21-2010, 09:45 PM   #1
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Jeep Starts, No Crank - No Priming

1999 Jeep Wrangler 4.0L just died on me as I'm driving to the bar just shut off and slowly rev'd down - not like it was an electrical problem (like a dead battery or alternator). Now the Jeep cranks but it won't start. Also, I'm noticing that I cannot hear the fuel pump prime and that makes sense that essentially, no fuel is getting to the engine so it won't start

Where should I start? The fuel pump relay is fine (swapped w/ Horn). Fuses seem to be in good condition. I dropped the tank a little while ago and the connections still seem to be solid.

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Old 06-21-2010, 09:54 PM   #2
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I would make sure no fuel is getting to the injectors before you start replacing things. if thats no go, ohm out the wires from the relay to the tank. But after that i would replace the fuel pump. They are relatively cheap.

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Old 06-22-2010, 01:22 AM   #3
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Where's the fuel pressure test port located on the 99 Wranglers?
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Old 06-22-2010, 01:39 AM   #4
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Schrader valve on the fuel rail
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Old 06-22-2010, 05:52 AM   #5
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Do you have spark?
No fuel may not be the only problem.

If no spark too then it's not the pump.

Try swapping the ASD Relay (Automatic Shut Down Relay) with the horn relay.

And, check to make sure there is 12 volts on the relays in the box - use a test lamp and probe the sockets. Just look to see if a few of the relays have 12 volts.
If not, unsnap the upper portion of the relay box and check underneath for a bad connection. Corrosion in there is a killer.

Find out if anything else doesn't work, like dash lights, blower, headlights etc. The combination of several things that failed (or nothing else) really helps track the fault down.
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Old 06-22-2010, 10:38 AM   #6
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check for spark. sounds like the coil died.
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Old 06-22-2010, 03:19 PM   #7
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How can I check for spark? I've checked my other components. My blower hasn't worked for a while but everything else seems to be working properly. How do I go about checking if the coil died. I'm going to replace all spark plugs now since hthat needs to be done anyway.
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Old 06-22-2010, 03:49 PM   #8
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I had a pickup just stop running like that it was the Cap & Rotor on the distributor just cracked! It was a simple 5 dollar part and it was back up and running!
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Old 06-22-2010, 03:52 PM   #9
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Originally Posted by burton160w View Post
How can I check for spark? I've checked my other components. My blower hasn't worked for a while but everything else seems to be working properly. How do I go about checking if the coil died. I'm going to replace all spark plugs now since hthat needs to be done anyway.
The Oklahoma way is to put a screw driver in one of the spark wires and put it close to a part of the motor that is metal and have someone turn over the motor if you see it spark you know its working!
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Old 06-22-2010, 04:01 PM   #10
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Haha if it's good enough for OK it's definitely good enough for the Pineys. I'll try to check for a spark. But it's weird that the fuel pump doesn't prime.
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Old 06-22-2010, 04:06 PM   #11
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If you dont hear a prime when the car is put into on but not cranking it means you have a fuel delivery problem. check the pump relay and the pump itslef.
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Old 06-22-2010, 05:02 PM   #12
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Pulled the spark plugs and they're pretty corroded Bosch Platinums. Btw how do you guys get 'em out past that pump? That took me a good 10 minutes



That's about where my plugs stand. Lengthy corrosion and oxidation because before I bought the Jeep it did sit for a while. I should have done this a few months ago

A new development is that my gas tank is showing as empty. I have a full tank of gas. Hmm...

I'm headed to the store to pick up a fuel pressure tester kit (I wanted one anyways) and to look into fuel pumps. If I cannot return it if I find that's not the cause then I'll hold out for another day with some more tests. I'm also grabbing some good spark plugs.

The ASD relay is good. The fuel pump relay is good. I have a test probe and know how to use it to check for grounds, but I don't know how I can go about testing the connectors or the relay plugs.

Fuel pump is definitely not priming still, there is SPARK (and btw I did end up shocking myself to my sisters amusement ), and my distributor cap has some small corrosion, but I brushed that off. Inside it looks clean and dry.
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Old 06-22-2010, 05:23 PM   #13
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Put in the plugs called out on the underhood label, or the factory service manual. It does NOT call out platinums.

The reason I asked if it had spark is not so much to check the coil but some ailments lose BOTH spark and fuel, some just fuel, some just spark.

How do you know the ASD relay is good? A voltmeter test isn't good enough of a test. SWAP IT OUT!

Can you feel the fuel pump relay clicking when the key is first turned on? Put your fingers on it to feel it.

Can you feel the injectors clicking when cranking? Put your fingers on it to feel it.
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Old 06-22-2010, 06:17 PM   #14
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Originally Posted by burton160w View Post

Fuel pump is definitely not priming still, there is SPARK (and btw I did end up shocking myself to my sisters amusement ), and my distributor cap has some small corrosion, but I brushed that off. Inside it looks clean and dry.
bahahaha, I was reading through this thread and was too late to warn you about that. Been there and done that before too lol
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Old 06-22-2010, 06:32 PM   #15
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Better hope its not your computer thats what happened to mine but it fixed it for like 2 weeks then all the stuff came back. Im sending the computer back and they will fix it. If thats not the case idk what ill do.
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Old 06-22-2010, 07:18 PM   #16
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besides checking for spark, pull codes from ecu, a bad coil tends to show up as low voltage to a few sensors. or you could just plug in another coil, no need to remove old. just plug it in conect coil wire and try to start.
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Old 06-22-2010, 09:11 PM   #17
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How do you know the ASD relay is good?
I swapped it with the Horn relay. All 3 relays are good and working. The fuel pump relay also does click.

I swapped out the spark plugs and replaced the cables (two were corroded). The distributor cap isn't cracked, warped or busted so I left that alone besides a little scrubbing. There's no codes to pull, I'm not getting a check engine light. I went ahead and rented a fuel pressure test kit from AutoZone, I didn't realize these things were free to rent! It's all fancy schmancy. Well, I'm still getting 0psi when trying to start it.

How can I go about seeing if there is power going to the fuel pump connector? There's four wires, a ground, and three others and I don't know which one is the right one to check. Like I said, I'm also showing my tank on E (it's full), so I'm still going with that assembly being messed up.
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Old 06-24-2010, 08:30 PM   #18
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Problem Solved: For anyone who stumbles across this thread

It finally ended up that the problem I was experiencing was my fuel pump had finally crapped out on me. Since it is such a common Wrangler problem, I'll go through the steps I went through to diagnose the problem properly and how I checked it.

Initial Symptoms: I was driving to the bar the other night when my car died while doing 50. It didn't shut off like an electrical problem or a dead battery. It just lost all power and slowly coasted down. I had time to pull over, but it wouldn't restart after that. The Jeep cranked and cranked strong, but wouldn't start. Nothing else appeared dead. Checked the lights, radio, and I have no blower motor already

The Garage:
  • First thing I did was listen for a fuel prime. That helps to narrow it down to the fuel system, since it cranked but sounded like it was choking for fuel. To listen for prime, turn the key to the ON position, but not start. It's easier if someone else does it while you listen at the rear under the gas tank. It should be a faint wirring sound. Try then getting a rubber mallet and beating the skid plate while turning it on. Sometimes they have a habit of getting stuck and that helps unsticking them.
  • I had no priming, so that means a few things to narrow it down to. Either power is not getting to the pump or the pump is faulty. Start easy. I opened the hood and pulled open the fuse box in front of the battery. Then I pulled the HORN relay (if your horn has been working) and swapped it with the FUEL PUMP RELAY. Test the horn, if it doesn't work then the relay was faulty (replace). If it works, then the relay should've been okay. Swap it again with the ASD RELAY and see again if the horn honks.
  • Okay, so the relay wasn't the problem. So then I checked for spark from the coil-pack. This is deviating from the fuel-system problem, but it's good maitenence so I wanted to do it anyway. To check for a spark, pull off one of the botts from your spark plug (grasp the boot). Stick a screwdriver in it with a plastic handle. Have someone try starting the car, and touch it to something else metal ON THE ENGINE. You should see it spark. Don't do what I did and use a screwdriver with a metal handle. OUCH! :shock:
  • If it sparks, you should be okay on the coil-pack. I swapped out my spark plugs and wires anyways just because I needed to do that. I swapped with Autolites AP985 (get over it, they're platinum) and noticed my spark plugs had some bad corrosion and erosion from sitting so long. Good thing I replaced.
  • Then I wanted to check fuel pressure. I loaned a fuel pressure testing kit from AutoZone for free w/ a $150 deposit. Hooked up the pressure-gauge (like a tire gauge) to the Shrader valve (located on the fuel line on the opposite side of the spark plugs) and turned the car on. No pressure, so I knew gas was being pumped through.
  • So after this I was almost positive I'm looking at a faulty fuel pump. One more test. Go underneath the gas tank in the rear and on the drivers side you'll see two tubes (gas/flow) and a connector w/ four wires. Look above the rear of your back tire. That connector is for the fuel pump. I took two ground testers and clipped the aligator clips together (ghetto I know) and then used the needle-prongs to test the SOLID BLACK and the ORANGE wires on the female side while someone started the car. They both lit so I had power going to my fuel pump. Test the opposite BLACK/GREEN and the GREEN wire and they should light, that's your FUEL GAUGE wire.
  • I then went and dropped the gas tank (see my other thread here) and undid the wiring and tubes and removed the fuel pump assembly. Since I had JUST bought a full tank of gas, I grabbed a siphon filter and pumped out the gas into containers. Make sure they're clean!
  • I then ran a bench test, basically dunking it in a 5 gallon bucket of water and wiring it directly to my battery. No dice.
  • I then went to Car-Part.com--Used Auto Parts Market and the guys over at Tilghman Auto in Jobstown, NJ hooked me up with an entirely assembly (EVERYTHING) off a 2001 Wranger for $60 w/ a 90-day warranty and fast service. Thanks! Came home, tested out the pump the same way, plugged it back in. Struggled with that AWFUL locking pump locking ring. And reassembled and now we're GOOD TO GO!

Supplies:
  • Spark Plugs
  • Wires - $22
  • Fuel Pump - $60 for whole assembly + 90-day warranty
  • Siphon Pump and Hoses - $15
  • Fuel Pressure Tester - $150 DEPOSIT, Free @ Autozone
  • Jackstands - had 'em
  • Hydro-Lift - had it
  • 13mm sockets + 3/8" wrench for removing gas tank
  • Spark Plug Socket and extensions
  • Phillips and flathead screwdrivers

I had a friend keep telling me that I was just going to keep throwing money at it and was wasting my time, so this felt really good when it started up right away after replacing the pump. I couldn't be any happier
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Old 06-25-2010, 09:44 PM   #19
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Did you check the price on the new pumps? Just curious. My 98 TJ won't start either. It cranks really well but no start. I live in a neighborhood with a lot of noise so I have no hope of hearing the whirr of the fuel pump. The weird thing is the jeep was running great and then it wouldn't start. It died in front of my house so it could have been worse. My AC died first then the no start thing. Does anyone know which fuse is for the fuel pump?
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Old 06-30-2010, 05:06 PM   #20
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Lightbulb no fuel pressure

What is it with jeeps, I have the same problem but the fuel pump is brand new. My problem took about a week from onset to not starting at all. My father thinks it is the ECU. It should arrive tomorrow if it works I let you know.

Using a spark plug tester is faster than trying to get the feeling back in your hand after getting shocked.
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Old 06-30-2010, 09:16 PM   #21
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Btw how do you guys get 'em out past that pump? That took me a good 10 minutes
Wobble-head extension.

Great summary btw. I've been looking at a possibly fuel pump related problem and that write-up seriously eased my mind a little about the diagnosis.
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Old 07-01-2010, 12:14 AM   #22
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ok i will regret posting this for sure but im sure you all will enjoy my stupidity.... i went through h*ll and back removing/ replacing my #1 o2 sensor
so after pulling the battery cables and wiping the computer four or five times i get all that fixed and somehow i think i have messed up my fuel gauge, so on my way to work today my jeep rolls over and dies at 50mph in the EXACT same way that the op's jeep did. After checking everything i could think of i had spark and it would crank but i had no fuel pressure and couldnt hear the pump prime i thought oh crap dead fuel pump.... but no it wasnt that my gas gauge was reading wrong and i had run out of freaking gas oh yea i missed work and wasted 4 hours and it was out of gas ... enjoy
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Old 07-01-2010, 01:23 AM   #23
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so after pulling the battery cables and wiping the computer four or five times i get all that fixed and somehow i think i have messed up my fuel gauge, so on my way to work today my jeep rolls over and dies at 50mph in the EXACT same way that the op's jeep did. After checking everything i could think of i had spark and it would crank but i had no fuel pressure and couldnt hear the pump prime i thought oh crap dead fuel pump.... but no it wasnt that my gas gauge was reading wrong and i had run out of freaking gas oh yea i missed work and wasted 4 hours and it was out of gas ... enjoy
Oh lord I've been there many a time that's a huge pain in the ass and it's only really been because i was too lazy to go get gas. The SAD thing is that my Jeeps never seen more then 1/2 tank. I'm simply too poor. But THAT DAY, I thought lets fill her up for once! And two minutes later it dies with 19 gallons of gas that i mostly had to dump

It's simple to see if the fuel pump is actually working by checking the fuel pressure at the Schrader valve.
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Old 07-01-2010, 10:56 AM   #24
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after yesterday mine may never get under a half tank broke or not ill just run out and get a syphon hose and "borrow" from the hummer community they have plenty to spare im sure lol
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Old 07-02-2010, 12:24 PM   #25
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Ok, just got mine running it needed an ECM. Now if I can just get the fuel gauge to read empty and not 1/2 when I'm out of gas.
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Old 09-23-2010, 04:11 AM   #26
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I am going thru the same thing with my 93 YJ 4.0, ugh. 3 solid days now. My Jeep is stranded on the street 2 miles away from home. I'm still trying to determine if it's the pump or the ECU or a sensor.(fuses in box by battery and under driver dash all seem to test okay). Praying it's not the pump, since dropping the tank etc seems beyond me. If it's the 3 capacitors in the ECU, I can handle that. I turn the key to On, no familiar hum of the fuel pump priming. Just a click(I presume from the relay in the box by the battery). When I then turn key to try and start it, it cranks, sounds strong, just wont friggin turn over...almost seems it wants to when i first add a bottle of injector cleaner to the tank. No fuel is getting to the fuel rail. Spark? Not sure. I read and reread your method, but I still don't understand what you did. Plus, 2 years ago, i bought new plugs/wires/cap/rotor..but couldn't get ANY of the wires off the friggin' plugs, so I just shoved the stuff in my Jeep and never changed it. So not sure how to remove the wires in order to do any sort of spark test? Can i just pull them off the cap and test them from there?
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Old 09-23-2010, 05:37 AM   #27
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they do make a tool to remove em-shouldn't cost much. plyers looking thing with nylon ends to grab the plug boot. just grab, twist(to break free) and pull. could pull one off dist. and use one of your new wires to perform the test.
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Old 09-23-2010, 06:47 AM   #28
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my Jeeps never seen more then 1/2 tank. I'm simply too poor. But THAT DAY, I thought lets fill her up for once! And two minutes later it dies with 19 gallons of gas that i mostly had to dump
There you go that is what caused it...your jeep had a full tank of gas and didn't know what to do

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