Fuel Injector Leaking - Easiest Way to Repair?

Rick351 on 06/11/2020 - 18:19
Last edited 06/11/2020 - 19:05 by 1 other user

Hey y'all,

So the other day had fuel leaking out my car and i noticed that there the fuel was leaking from the fuel injector(not sure what's called) out of the pipe whenever I hit the gas. I tightened the nut thinking yeah easy fix but still had the same problem occur. So I removed the nut to see if there are any visible holes, gaps between the thread(rail) and pipe and looks completely fine(110% sure).

What do your OzBargainers suggest I do to fix this problemo? Go to a wrecker and replace the pipe or…

Automotive

Comments

oscargamer on 06/11/2020 - 19:17

+1

The easiest way would be to take it to a mechanic.

The cheapest way would be DIY.

Does that help?
- Rick351 on 06/11/2020 - 19:40
  
  +1
  
  oscargamer my friend that was very helpful give yourself a pat on the back.
brendanm on 06/11/2020 - 19:56

+2

To start with, that's not "gas", it's diesel. You probably have to replace the injector pipe, as it is probably deformed on the end where it meets the rail.
AdosHouse on 06/11/2020 - 19:57

Most likely there is an o-ring just inside the mount. Decompress the fuel system, pull the pipe out and check.
- brendanm on 06/11/2020 - 20:12
  
  There is no o ring there. Also, the fuel system has zero psi in it with the engine off.
  - AdosHouse on 06/11/2020 - 21:02
    
    Well no easy fix then.
    
    Fuel system is different to my last car then, which if this is a diesel stands to reason since mine was a petrol. Forgetting to decompress the fuel lines, changing the fuel filter and copping pressurised fuel straight into the eye sucked a fat one.
    - brendanm on 06/11/2020 - 21:29
      
      Fuel in the eye is never very much fun :(
      - AdosHouse on 06/11/2020 - 21:33
        
        @brendanm: The double whammy was when I did that I reflexively tried to sit up which resulted in my head making friends with the underside of my car.
Rick351 on 06/11/2020 - 20:18

There is no o-ring/washer. Here is a photo i have just taken. Do i need to add a sealant on the thread?
https://ibb.co/jwGRkHn
- brendanm on 06/11/2020 - 20:24
  
  +2
  
  https://www.ozbargain.com.au/comment/9572974/redir
- pegaxs on 06/11/2020 - 21:36
  
  Pipe seat is deformed and chaffed. As brendan has said, replace the pipe.
  
  Do i need to add a sealant on the thread?
  
  Nope. That won’t help. Now how these type of connections seal.
  - Rick351 on 07/11/2020 - 08:37
    
    I did pull that pipe up when i had that photo taken. It looked normal the way it was sitting on the thread. I'm gonna go to a wrecker and replace the pipe. Hopefully🤞 that does the trick.
    - brendanm on 07/11/2020 - 08:55
      
      Is highly recommend getting a new one, not from the wreckers.
      - Rick351 on 07/11/2020 - 10:04
        
        @brendanm: Yeah just went to a wrecker in springvale, they don't have it. Where can i buy a new pipe? Online?
        Thanks
        
        MS Paint on 07/11/2020 - 13:19
        
        @Rick351: For your car?
        
        brendanm on 07/11/2020 - 14:15
        
        @Rick351: No one know what car you have, however there are lots of diesel places that sell injector pipes. Also the dealer, always worth asking as sometimes they are priced ok.
        
        Rick351 on 07/11/2020 - 15:45
        
        @brendanm: Toyota Hiace 3.0L diesel 2008
        
        brendanm on 07/11/2020 - 15:53
        
        @Rick351: Price one up from Toyota, baileys diesel, eBay etc. About $100 from a quick look.
        
        Rick351 on 12/11/2020 - 19:29
        
        @brendanm: Just replaced the pipe… same problem. What am i supposed to do? I've installed a few split systems(i'm a sparkie) and usually you whack some oil(not sure what it's called) on the thread and it prevents any leaks from occuring. The thread on the large pipe that the injector pipe goes to is 99.9% fine.
        
        brendanm on 12/11/2020 - 20:25
        
        @Rick351: Check the surface of the common rail that the pipe seals against. Is there some sort of damage there? Nothing is to be used on the threads or sealing surfaces. Did you get a new pipe, or used?
        
        Rick351 on 12/11/2020 - 20:30
        
        @brendanm: Brand new. Old and new pipe looks identical. No damage that i could see….
        
        brendanm on 12/11/2020 - 20:32
        
        @Rick351: There is a reason it's leaking, so take it off again and have a good look. Also clean it down well, and make sure it's leaking where you think it's leaking, and not something else running down.
        
        Rick351 on 29/11/2020 - 09:34
        
        @brendanm: There is a leak on the fuel rail that can barely be seen by the naked eye(literally) suprisingly… had trouble removing one of the bolts(damaged the head with the spanner not so bad) need to remove the orange thing(not sure what it's called) so i can remove the bloody bolt once i get the chance. Thought i'd provide you with an update in case you happen to come across a problem similar to mine(1 in a million) in the future…
Andey on 06/11/2020 - 21:16

+1

Brendan is right,
Best to fit a new pipe as they're considered serviceable items.
These usually come off when carrying out maintenance like valve clearances or manifold cleaning.
Many manufacturers recommend replacing diesel fuel rail pipes after they have been on and off a few times.
Replace all if not too expensive and wanting longevity.
Recommended to torque to spec, use crowfoot wrench at horizontal angle, 90 or 270 degrees to stay within torque range.
51722 on 06/11/2020 - 21:22

Agree with Andey and brendanm above. Not well versed in pipes / fittings, but looks like an inverted flare fitting. Doesn't need an o-ring and is compression sealed. Recommend getting new pipe.
- jackinyourbox on 06/11/2020 - 22:34
  
  I’m just putting it out there but it’s possible to Jb weld it.
  - brendanm on 06/11/2020 - 22:54
    
    No it's not, pressure in diesel common rail systems is about 30,000psi.
    - jackinyourbox on 06/11/2020 - 23:02
      
      -3
      
      It’s definitely possible. Appears to be a deformed flare. Jb weld as a seal then screw the nut back and wait 24hrs.
      
      It’s considered ghetto, dont know what this guys financial situation is but it’s much better than causing a fire under the “bonut”
      - pegaxs on 07/11/2020 - 08:47
        
        @jackinyourbox: Not sure if serious or trolling.
        
        The JB Weld could do more damage than the problem it is trying to fix. It could get into the fuel line, or cover the end of the pipe. The JB could cause issues with the threads at removal time and require the whole rail to be replaced.
        
        I wouldn’t recommend this even as a ghetto fix.
        
        jackinyourbox on 07/11/2020 - 10:16
        
        @pegaxs: No I’m not.
        
        I believe it’s the easiest repair. Yes, could get into the fuel line but it depends on the guy skill. The deformity is slight, the lines are lined with fuel, and JB weld isn’t that viscous. You got to be pretty incompetent to stuff the seal up.
        
        In terms of locking the nut in place and future repair difficulty, maybe. Address it when the time comes. It may never occur. Those items you are worried about are all consumable items.
        
        brendanm on 07/11/2020 - 14:17
        
        @jackinyourbox: Absolutely ridiculous suggestion. Even if that ghetto fix manages to fix it, doesn't get any junk in the injector, and actually seals, you have then made it so you can never get the line off. Then if you need to do any injector or fuel system work, you are up for a new common rail, as well as the pipe that you should have replaced anyway.
        
        jackinyourbox on 07/11/2020 - 14:51
        
        @brendanm: That’s not entirely true.
        
        It can come off quite easily with a bit of torsion. What you are creating is a custom gasket using JB weld. The actual secure nut is load bearing.
        
        Also “junk” could also get in anyway when the guy unsealed the fuel line regardless of my suggestion or yours.
        
        I only mentioned this unconventional solution because you guys previously deemed it impossible. Whereas in reality he should of just took it to a mechanic and payed for their services. Their biggest issue is fuel leaking in an hot engine bay and fires
        
        brendanm on 07/11/2020 - 15:05
        
        @jackinyourbox: It's diesel, it doesn't catch fire like that. JB weld isn't a gasket material.
        
        jackinyourbox on 07/11/2020 - 15:12
        
        @brendanm: Not small diesel leaks. Yes, unconventional gasket. Anyway, Ive put in enough of my input
        
        brendanm on 07/11/2020 - 15:35
        
        @jackinyourbox: Some would say too much.
        
        jackinyourbox on 07/11/2020 - 15:41
        
        @brendanm: Only because you keep saying “but, what about this”, “but then what about this huh?”. I thought it would of been rude to not reply.
        
        brendanm on 07/11/2020 - 15:43
        
        @jackinyourbox: I meant simply that you suggested using JB weld as a leak fix on a comment rail diesel full stop, not your subsequent posts.
        
        jackinyourbox on 07/11/2020 - 16:17
        
        @brendanm: I wasn’t going to mention it but JB weld is also metal set which is used in the military. It’s not unheard of to use it.
        
        brendanm on 07/11/2020 - 16:30
        
        @jackinyourbox: I'm well aware it's not unheard of to use in some circumstances. This is not the correct circumstance.
Willco88 on 06/11/2020 - 22:36

-1

Change injectors
- pegaxs on 07/11/2020 - 08:48
  
  The issue seems to be on the fuel rail, not the injector end…

Fuel Injector Leaking - Easiest Way to Repair?

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