Jeep Wrangler Forum

Jeep Wrangler Forum (
-   TJ Tech Forum (
-   -   TJ not starting good (

FloridaTJ 11-04-2012 08:29 AM

TJ not starting good
when i go out to start my jeep i usually have to just let it crank a time or two it seems as if its not getting spark but it has new plugs in it. i was told by a mechanic it wasnt the starter, so can someone help me with this problem??

chodge40 11-04-2012 08:38 AM

I usually have to turn key and let the engine light turn off then crank and it should turn right over!

FloridaTJ 11-04-2012 08:46 AM

ive tried waiting, it just never wants to fire up on the first try

brandon-99tj 11-04-2012 08:56 AM

Try turning the key from off to on (without starting it) 3or 4 time then start it. If this works it is probably you fuel pressure regulator.

FloridaTJ 11-04-2012 10:33 AM

wow i just did that and it started right up, lol first time its done that in a while!!!
do i need a new regulator or how exactly do i fix this?

brandon-99tj 11-04-2012 10:45 AM

Yup need a new fuel pressure regulator. I havent had time to change mine yet. You have to drop the gas tank and i believe the fpr sits right on top of the fuel pump....could be wrong on that but i know its right on top. Spose to be an easy install after you get the tank down.

Jerry Bransford 11-04-2012 10:54 AM

2 Attachment(s)
This problem is far more common in TJs than should be, that is for sure. Based on your symptom, it is easily fixed by replacing your fuel pressure regulator which sits outside of the gas tank on top of the fuel pump.

When the FPR leaks, it allows the fuel that is supposed to stay in the top-end of the engine (fuel rail that the fuel injectors plug into) for fast starts to instead drain back down into the gas tank. The extended crank time until the engine starts is how long it takes the fuel pump to get fuel back up to the engine. Turning your ignition switch on-off-on a few times to cycle the fuel pump before trying to start the engine will help shorten the start times until you can replace the FPR.

Once the fuel tank is dropped, it takes less than 5 minutes to swap the FPR which simply snaps in & out of the fuel pump. I'm holding a new FPR in the below pic, you can see the old FPR below on top of the gas tank.

RockAuto Auto Parts is a great source for them. Rock Auto's pricing and delivery times are hard to beat.

FloridaTJ 11-04-2012 10:54 AM

how much can i get one for? should i go with aftermarket or OEM?

Jerry Bransford 11-04-2012 10:59 AM


Originally Posted by FloridaTJ (Post 2959036)
how much can i get one for? should i go with aftermarket or OEM?

Have you checked out the Rock Auto link I gave above yet? OE is always best but when $$$ is low, you can get a decent replacement for $60-90 or so from Rock Auto. I have purchased at least three from them over the years. I think mine were usually made by Airtex. And of all the sources for parts I have used over the years, Rock Auto is #1 in my book for pricing and everything I need from a parts supplier.

Rock Auto lists it under Fuel Injection Pressure Regulator...

FloridaTJ 11-04-2012 11:12 AM

oh i didnt even see that, okay awesome!! thanks for the help. when i replace it ill be sure to post it

CapeCodET 11-11-2012 03:23 PM

I had the same problem so I decided to replace the pump as well since it's got 136,000 on it.

Just wanted to note that what takes 1.5 - 3 hours some places can take much longer if you've got a salt induced rusty undercarriage.

The four nuts in the back of the skid plate came right off. All three front ones just spun in place. I ended up having to drill holes in the floor to get to the heads of the bolts. Actually, only the center one had a hex head, the other two were carriage bolts that I had to drill out.

All times are GMT -5. The time now is 04:39 AM.

User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.