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Bad Fuel Rail, Spraying Gas everywhere after -FRUSTRATED!


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Fired up the MJ today for the first time after installing new Injectors, putting the rail back on, figuring out where all my Vac lines were supposed to go...

 

As soon as it fired up it started spraying gas everywhere... I was rushing to turn the engine off before I had a BIG problem, but it sure appeared to be coming from this seam highlighted in red...

img4882s.jpg

 

Is this just a bad rail or is there something (additional) that I screwed up...since it seems I'm better as screwing crap up than I am fixing it...

 

FRUSTRATED

Wade

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Was it fine before? Did you "man handle" it to get it off the injectors? Are you sure its fully seated on the new injectors??

 

If yes, maybe time for a trip to the PnP for a new one...

 

CW

 

I don't think I was overly rough getting it off, had zero issues before, and am fairly certain the injectors are seated well into the rail and in the engine...and from what little bit that I saw it was spraying there at that seam and not any of the injector connections.

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that looks like where the fuel pressure regulator attaches to it... try getting a new fuel pressure regulator... bout 15 bucks IIRC. looks like the seal between the rail and the regulator

 

might be able to just get an o-ring for it.

 

If this is the same thing, RockAuto wants almost $70...

 

1989 JEEP COMANCHE PIONEER 4.0L 242cid L6 MFI (L) : Fuel/Air : Fuel Injection Pressure Regulator

STANDARD MOTOR PRODUCTS Part # PR21

 

PR21_FULL.jpg

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Pretty sure it's just the o-ring Wade. Pull it out and bring it down to your friendly Advance Auto or similar - they'll have a suitable replacement. Or you can get the complete o-ring kit from the dealer (injectors and regulator), p/n 83503637, about $14.

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Pretty sure it's just the o-ring Wade. Pull it out and bring it down to your friendly Advance Auto or similar - they'll have a suitable replacement. Or you can get the complete o-ring kit from the dealer (injectors and regulator), p/n 83503637, about $14.

 

It *might* have just been the o-ring untill I beat the crap out of it with a rubber mallet...I'm thinking I need to schedule a trip to the local PnP to see if I can get a new assembly...That's not easy and will probably be a couple weeks before I can fit that in (I'm about 45 minutes to the closest PnP and with the kids and stuff it's a pain)...

 

So I guess a few more weeks of a 'dead' MJ... Glad my TJ is doing good...

 

Sw2

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It *might* have just been the o-ring untill I beat the crap out of it with a rubber mallet...I'm thinking I need to schedule a trip to the local PnP to see if I can get a new assembly...Sw2

 

Oh - didn't know you baptised it w. the BFRH. :eek: Yeah, the rails (I think) are just silver soldered at the joints - wouldn't take much beating to spring a leak. Prolly best to get a new old one at the yard..........

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It *might* have just been the o-ring untill I beat the crap out of it with a rubber mallet...I'm thinking I need to schedule a trip to the local PnP to see if I can get a new assembly...Sw2

 

Oh - didn't know you baptised it w. the BFRH. :eek: Yeah, the rails (I think) are just silver soldered at the joints - wouldn't take much beating to spring a leak. Prolly best to get a new old one at the yard..........

 

Well, I did it sometime after I posted the thread and the question and after it started spraying more and before I read your reply... so when I posted the pic, it was probably just the O-Ring...but being the stubborn, pissed off and frustrated dude I am, I took out some frustration...

 

I'm getting tired of messing with this thing and still have to worry about the leak under the dash before my rainy season starts... I haven't even started taking the dash apart yet...maybe breakout the BFH to make that a quicker job too! :fs1:

 

SWII

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Wade, would it cheer you up if I took a pic of where my floor used to be ;) I have to pic some parts up from the jeep place near me that i won on ebay this Monday, I can see if they have an extra rail around for cheap and ship it out to you if they do. Save you a long drive :dunno: LMK

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Wade,

I gotta post my experience with the same thing...

 

Last winter before I moved out of my ex's place, I had the same thing happening to my 90 MJ. I changed the o-ring, and it was still doing it...gas everywhere.

 

I found a replacement through the "Wanted to buy" section on JU. The guy said the motor on his 89 XJ siezed up the week before, and that the fuel rail was never an issue. I think I paid around $20 for the replacement rail, complete with the regulator. Once I got it and hooked all the injectors up, the same dang thing was happening. I got frustrated and just let the MJ sit in the driveway for the next 3 months, as I had no idea what to do.

 

Cut to January of this year. I moved out and had to drive the MJ to the new place. I thought for sure it was going to catch fire on the drive, but when I got it to the new house and popped the hood, there wasn't a spec of gas anywhere.

 

The only thing that I can think of is that since my fuse panel was eaten so bad by DOT 3, it was somehow causing the fuel to run in to the rail at full blast the entire time? I'm not sure if that is a correct assumption, but that's the only thin I can think of. Since the electrical problems were intermittent, that was the only explanation that I could think of.

 

Obviously take all of this with a grain of salt, as my 90 is just sitting with no harness right now... :cheers:

 

Aaron

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SW...there's like a .06 cent O ring in there that you need to replace.

 

But if you went bonzaii on it with a mallet, odds are yer gonna need more than just the O ring..... :no:

 

;)

 

Jeff

 

Well, it was a rubber mallet, and I can't see that's it's actually bent or deformed, but the gas sure shot out at a different angle (basically shooting toward the front wall of my garage a few feet in front of the MJ), so I assume I f'ed it up.

 

maddzz1, thanks for the offer mate, but this will at least give me an exuse to give to the wife for a Pik-n-Pull day in the near future.

 

LoTGoD, I don't know that I've had any specific identified electrical issues, but I know my fuse box under the drivers side dash has been subject to drippage since my cowl area leak is right above there.

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.....as my 90 is just sitting with no harness right now...

Aaron

 

Not to stray off topic, but you STILL haven't gotten your harness yet??????

 

If you just need the engine-side, I can run down to the pick-n-pull (going there tomorrow anyway) and pull you an XJ one. No MJ's in there currently....lemme know.

 

Jeff

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  • 2 weeks later...

Back on Topic... Dropped in new Fuel Rail from P-n-P, and other than a nearly dead batter that I had to jump (will likely need a new battery also), it fired right up, no fuel spraying all over the place, and in very drivable condition again!!! YEAH!!! :banana: :banana: :banana:

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Glad you got 'er done SW2. :thumbsup:

 

Now the hope is to get the rust spot under the dash patched somehow on Sunday and get my Interior started to go back in. The spot is "bigger" than I remember it....ick!

 

EDIT...Opps, I forgot I need to try to get it smogged so I can DMV the thing...I'm past due on my tags since it wasn't running.

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i wish i had seen this earlier, rockauto was wrong on their price. that was the price for an HO regulator.

 

the renix piece is ~20 bucks at most local auto parts stores.

 

No worries, I got the fuel Rail with the nice regulator attached for like $15 at the overpriced P-n-P..

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