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Fuel injector leaking


 
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90XJ4X4
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Joined: 15 Jul 2005
Location: North of Amarillo Texas

PostPosted: Mon Feb 13, 2006 8:41 am    Post subject: Fuel injector leaking Reply with quote

I smelled gas the last 2 or 3 times driving the XJ, looked under the hood and found the first 2 injectors leaking.

Have any of you experienced this?

If I need to replace them do I do all 6 (makes sense to me)?

19 lb. or up to 22 lb?

Any suggestions?
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ThePhantum
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Joined: 23 Jan 2004
Location: I knew it...I'm surrounded by Assholes!

PostPosted: Mon Feb 13, 2006 10:26 am    Post subject: Reply with quote

It's most likely the o-rings leaking and not the injectors themselves, so I would replace all the o-rings. Most auto parts stores sell o-ring repair kits. There's 13 all together: 6 on the engine side, 6 on the rail side and one for the regulator. You'll also need 2 quick connect hose repair kits for the inlet and outlet fuel line connections. You can get away with using the existing quick connectors, but for a few bucks more and the ease of replacing them, why risk another leak?

It will be a lot cheaper than replacing the injectors.

HTH
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90XJ4X4
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Joined: 15 Jul 2005
Location: North of Amarillo Texas

PostPosted: Mon Feb 13, 2006 8:29 pm    Post subject: Reply with quote

Thanks Phantum, I almost bought a set of injectors for 200 bucks. After reading your reply I went to Autozone and spent 9.99 on a o-ring kit.

Saved me a bunch. Very Happy
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1fox2go
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Joined: 01 Dec 2004
Location: Fishersville, Virginia

PostPosted: Mon Feb 13, 2006 9:35 pm    Post subject: Reply with quote

did it fix it?
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90XJ4X4
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Joined: 15 Jul 2005
Location: North of Amarillo Texas

PostPosted: Tue Feb 14, 2006 7:37 am    Post subject: Reply with quote

I have not installed the new o-rings yet. I'll let you know how it worked out when I am finished.
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dlocke
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Joined: 08 Feb 2006
Location: Maine

PostPosted: Tue Feb 14, 2006 10:17 am    Post subject: Reply with quote

Last week I won a set of Ford 19 lb. orange top fuel injectors on ebay for 22 bucks plus shipping. My understanding is that they make a great replacement for RENIX injectors and will not fail at the crimps (as they are not crimped). These injectors are common as they came stock on 5.0 Mustangs and lots of guys with stangs beef up to 24 lb. injectors.
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90XJ4X4
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Joined: 15 Jul 2005
Location: North of Amarillo Texas

PostPosted: Tue Feb 14, 2006 4:39 pm    Post subject: Reply with quote

Heres a link to Jeep injectors, http://www.fiveomotorsport.com/Injector_SetsJEEP.asp

I have had good results with ebay, how about you guys?
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90XJ4X4
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Joined: 15 Jul 2005
Location: North of Amarillo Texas

PostPosted: Thu Feb 16, 2006 9:33 am    Post subject: Reply with quote

I installed the new o-rings and now most of them are leaking.

I noticed that there was a bunch of carbon build-up in the manifold injector holes, that may explain why its leaking there. Its also leaking at the rail holes.

First thought...wrong o-rings but no, they are the same as the ones I took out.

Second thought...maybe too high fuel pressure in the rail?

I installed a 1000 amp battery and the leaking started right after the battery job, could that be related?

I am stumped, what should I do?
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ThePhantum
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PostPosted: Thu Feb 16, 2006 10:31 am    Post subject: Reply with quote

Is the rail torqued down properly? The bolts should be 100 in/lbs. Too little and the o-rings won't hold the pressure. Too tight and they'll be crushed and leak.

There's an access port on the rail to connect a gauge to...you won't get accurate reading with leaks though. Normal pressure should be around 45psi.
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90XJ4X4
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Joined: 15 Jul 2005
Location: North of Amarillo Texas

PostPosted: Fri Feb 17, 2006 9:04 am    Post subject: Reply with quote

I will go buy a guage and check the torque on the rail bolts. It may be a few days before I get under the hood again, its about to start snowing and I don't have a garage.
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90XJ4X4
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Joined: 15 Jul 2005
Location: North of Amarillo Texas

PostPosted: Mon Feb 20, 2006 3:23 pm    Post subject: Reply with quote

I went to NAPA and Autozone today, looking for a gauge to check fuel rail pressure. They were no help at all.

Any suggestions? Anyone ever made their own?

I figure the best thing to do first is to be sure my pressure is not grossly beyond 45lbs. If its OK I will tear it down again and put it back together very carefully, checking the torque and position of the rail bolts & holes (theres room for a little movement there.)
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LicKwiD
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Joined: 23 Jan 2006
Location: Bethlehem

PostPosted: Tue Feb 21, 2006 10:41 pm    Post subject: torque Reply with quote

Be sure you use the proper torque settings of 100 in/lb. not ft/lb. I made this mistake and kept cranking on those little weak bolts and the heads eventully snapped off and left me with the threaded end stuck in the manifold holes. Tried to drill them out with little success, and had to resort to buying a used manifold.
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90XJ4X4
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Joined: 15 Jul 2005
Location: North of Amarillo Texas

PostPosted: Thu Mar 09, 2006 7:07 am    Post subject: Reply with quote

I took the plunge and bought a set of disc-type injectors, Bosch D5B's (19 lb.). When I looked closer at the o-ring job I found that the old injectors were leaking, not the o-rings.

Heres the current situation, any help will be appreciated...

The engine runs great and I have no leaks. It is definately running rich though, and blows black smoke when I floor it.

The D5B's are supposed to be a fuel ECONOMY upgrade, not a fuel wasting upgrade. I disconnected the battery for 2 hours hoping for the ECM reset and better mixing of fuel/air but still run rich. The MAP vaccum hose was broken at the throttle body, fixed that and while it runs smoother, it still runs rich....any ideas?
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90XJ4X4
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Location: North of Amarillo Texas

PostPosted: Wed Mar 15, 2006 4:28 pm    Post subject: Reply with quote

No leaks, no smoke and getting 22 mpg... Very Happy
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