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Old 04-12-2014, 05:30 PM   #1
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Starting issue!

So first start of the day is perfect. But after it starts up and gets warm when you turn off the engine and let it set bout ten minutes or so it takes it bout 25 to 30 seconds turning over before it will start PLEASE HELP!

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Old 04-14-2014, 06:56 PM   #2
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Bump!

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Old 04-14-2014, 07:06 PM   #3
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I had the same problem. I posted a thread on here about it and people told me it was the neutral switch. They told me to take off the neg lead switch for 10 minutes and reconnect and try
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Old 04-15-2014, 07:00 AM   #4
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A little diagnosis on your part would help us. Start with the basics, what are you not getting? Fuel or spark?

Per your post it appears to be a heat/heat soak condition. Something is getting hot and breaking down. Once it cools it works again. After finding which item is missing, fuel/spark, I'd go down the list of likely culprits. Such as relays, fuel pump, CPS sensor, etc.
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Old 04-15-2014, 08:39 PM   #5
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I think it may be a fuel issue when it's hot I can turn it off a start it rite back up and it does fine but when it sits a little bit while hot is where the issue is. I don't think it's a spark issue it's kinda like a vapor lock but not sure how to stop that
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Old 04-21-2014, 01:43 PM   #6
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I think it may be a fuel issue when it's hot I can turn it off a start it rite back up and it does fine but when it sits a little bit while hot is where the issue is. I don't think it's a spark issue it's kinda like a vapor lock but not sure how to stop that
Sounds like my current problem.....what a pain in the butt!!!
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Old 04-22-2014, 09:26 PM   #7
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I agree completely someone told me it could be that fuel pressure regulator on the end of the fuel rail
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Old 04-22-2014, 09:41 PM   #8
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I agree completely someone told me it could be that fuel pressure regulator on the end of the fuel rail
Ya that's probably it. It's tested at fuel rail. It's in the tank. Basically when it's working fuel pump builds pressure and you drive. You turn off your Jeep and the regulator holds pressure keeping fuel in the fuel rail. Go to start it again and it fires right up. It goes bad you park. Go in the store for 5 minutes come out it fires right up. Let it sit over night and the gas all drains back into the tank. You have to turn it over along time to start. Or leave the key in on for a while before you crank the starter. This will run the pump too.
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Old 04-22-2014, 09:58 PM   #9
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Mine has been like that since I removed the tank 4 times when I moved the tank up 4" for better ground clearance. Cycle the key a couple times to build pressure before you try to start it. It is a jeep!
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Old 04-22-2014, 09:59 PM   #10
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Mine has been like that since I removed the tank 4 times when I moved the tank up 4" for better ground clearance. Cycle the key a couple times to build pressure before you try to start it. It is a jeep!
Or fix it crazy lol.
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Old 04-22-2014, 10:01 PM   #11
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Or fix it crazy lol.
Too many other important upgrades! Fuel pump is $300. That can buy 1- 37" tire or most of one.
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Old 04-22-2014, 10:20 PM   #12
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Mine has been like that since I removed the tank 4 times when I moved the tank up 4" for better ground clearance. Cycle the key a couple times to build pressure before you try to start it. It is a jeep!
Or you could just leave it On. Cycling or turning it on off will just make the fuel pump run less. I would turn it to on and wait then crank. I would just start from scratch in the morning and start cranking and counting one one thousand two one thousand until it starts then I know how long fuel takes to go up. Then the next days I would turn my key to on then count one one thousand and so on until I get to my starting time then crank the starter.
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Old 04-23-2014, 06:53 AM   #13
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When the key is turned to the run position the fuel pump runs for a preset 2-3 seconds regardless of fuel pressure. After that you must either crank the engine or cycle the the ignition switch to engage the fuel pump. You can sit there all day with the key in run position and build no more pressure than the initial 2-3 second prime.
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Old 04-23-2014, 08:41 AM   #14
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Not 100% 0n 4 cyl but for the 4.0 no regulator on rail on TJ as regulator is in tank

The previous model wrangler the YJ last produced in 1995 did have a pressure regulator on the rail and a return line to the tank but 4.0 TJ only a feed line to rail and regulator back in the tank

Based on my experience with a kill switch that precludes any elec power getting to fuel pump, with a correct functioning TJ fuel system even after sitting a parked for week or two there is sufficient residual rail pressure to start and run for a few seconds
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Old 04-23-2014, 09:12 AM   #15
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it's kinda like a vapor lock but not sure how to stop that
Bar magnets along your fuel rail/line can help prevent vapor lock... But isn't there a backflow preventer to keep the rail full of fuel? Should remain pressurized.... But you have no prob in morning so I'd say heat soak. Any time an electrical component gets hot resistance skyrockets
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Old 04-23-2014, 09:20 AM   #16
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I know I can't hear my fuel pump cycle, but try having some one beat on the tank with a hammer whilst some one turns it over. If it is an intermittent fuel pump issue you can rattle them into obedience.
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Old 04-23-2014, 09:51 AM   #17
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So first start of the day is perfect. But after it starts up and gets warm when you turn off the engine and let it set bout ten minutes or so it takes it bout 25 to 30 seconds turning over before it will start PLEASE HELP!
I have the same problem with my 02 TJ. First start is fine. Once it gets hot I can turn it off and right back on again but if it sits for 5+ minutes or so, I try to turn over for a few seconds turn key back and turn it over again and it starts right up. Havent run in to any problems with it other than its annoying, but would be nice to know what the fix is.
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Old 04-23-2014, 08:11 PM   #18
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[QUOTE="All Terrain TJ;10089873"]When the key is turned to the run position the fuel pump runs for a preset 2-3 seconds regardless of fuel pressure. After that you must either crank the engine or cycle the the ignition switch to engage the fuel pump. You can sit there all day with the key in run position and build no more pressure than the initial 2-3 second prime.[/QUOTE

Didn't know that. Thanks man.
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Old 04-24-2014, 12:43 PM   #19
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This is the regulator that is on my fuel rail
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Old 04-24-2014, 12:59 PM   #20
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And this on top of my tank
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