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Unread 07-18-2010, 03:00 PM   #1
dagr8tim
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Leaky Injector

I suspect I have a leaky injector. I am basing this on the fact that up until the last week or so, I had to do the flip the key trick to pressurized the fuel system for it to start. Also, the longer the Jeep sits since the last time it was run, the harder it is to start. If it's only off for afew minutes, it starts with no problems. At the time I assumed it was the check valve in the gas tank.

For the past week, it's been taking more key flips to get the jeep started & there's been a longer crank time. When it starts, it runs rough for about 30 seconds like it's flooded.

I've got a 2nd set of injectors in my parts XJ and a new set of felpro injector o rings. I plan to start the Jeep an use a set of vice grips on the gas line to prevent fuel from leaking back into the tank to test if it's leaking from an injector. There doesn't appear any external leaking.

My question is how to I diagnose which injector is bad if it is leaking from an injector?

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Unread 07-18-2010, 03:07 PM   #2
abnormal
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with the engine running look real close at each injector, you will see tiny bubbles and fuel seeping out. But you should smell it if its leaking. I had a bad injector and it barely leaked but you could smell it 10 feet away.
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Unread 07-18-2010, 05:45 PM   #3
kbad
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hey man....did you check your cps?....do you smell gas around the injectors when running/giving gas?....if leaking, it may be just bad o-rings.....but should replace all o-rings while at it!.....make sure to dab some oil on the o-rings before so they don't rip..... good luck!
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Unread 07-18-2010, 06:49 PM   #4
dagr8tim
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Quote:
Originally Posted by kbad View Post
hey man....did you check your cps?....do you smell gas around the injectors when running/giving gas?....if leaking, it may be just bad o-rings.....but should replace all o-rings while at it!.....make sure to dab some oil on the o-rings before so they don't rip..... good luck!
I had thought about the CPS, but it's only when it's overnight cold. Plus, the jeep has no problem cranking, it just doesn't fire.
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75 CJ5 with a badly chopped CJ7 Tub - Pandora
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Unread 07-18-2010, 07:12 PM   #5
kbad
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okay then....if no leaks at injectors.... then how about the iac, is it gunked up?...... and how's your whole fuel system? from tank to injectors what is new/old? specifically, is your fuel tank stock?....how about the vacuum system, any leaks or gunked up lines?.....specifically, the 'egr' solenoid?....
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Unread 07-19-2010, 08:17 PM   #6
brevard95
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just pull out fuel rail with injectors attached, turn key on to pressurize, look for leaky injector. I guess its possible to only leak when hot, but I kinda doubt it. How fast does rail loose pressure on cold engine if you key on, no start engine, and key off. I would guess, don't loose more than 5 lbs in 5 min.
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Unread 05-31-2012, 12:37 PM   #7
wrangler1988
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did u ever resolve this? im having the same issue.
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