Fuel injector leaking from o-rings. OK to just replace o-rings? - Ford Mustang Forum
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post #1 of 4 (permalink) Old 08-18-2002 Thread Starter
xTroublex's Avatar
Joined: Jul 2002
Location: Tampa Bay
Posts: 21
Question Injector Leak

Thanks for your time today

I noticed one of my fuel injectors leaking to the point where there is a small wet section on my lower intake, not a puddle but it is wet where the injector goes into the intake so to get at them all I took the upper intake off, I also noticed a couple others that were slightly wet near the top of the injector / where the fuel rail and injector come together. Only one was really wet all the way to the bottom but at the same time none of them appear to act like my lawn sprinkler when the car is runnin. I was worried about creating a fire even with the slight leak, I have seen carbs backfire and look like a BBQ Grill so the last thing I want is to cook one of my favorite toys from a leaking injector.

I took the fuel rails off (they are not bent or out of shape) and removed the injector that I noticed leaking, the injector looks fine, it doesnt appear to be broken. The o-rings on top and bottom of the injector look fine, no cracks but that doesnt mean they dont need to be replaced. I have to LOL at how they go into the intake. Call me nieve and this is the first injected car I have worked on myself but I expected them to screw in not just depend on an o-ring and the fuel rail to hold the injector in place.

Anyway My question is since I feel the injector is leaking from the o-rings should I just replace the o-rings and put it back together or drop $200 on new injectors? I hate like hell to replace them since the car runs great and I plan adding some mods / 24lb injectors in about 6 months. I am still researching the project at the moment so I would like to avoid buying injectors right now if possible.

Any feed back or past experiences on this topic would be greatly appreciated,
Thanks again, Have a Good One

PS looking at the motor with no upper intake makes me want to bolt a carb on and go old school

'88 GT 302 TT
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post #2 of 4 (permalink) Old 08-18-2002
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Drop the carb, put your hands up and slowly step back from the fuel-injected engine.

Replace those o-rings. They may look ok, but o-rings can shrink over time. Make sure the bores are clean and free from any nicks. I use a very thin film of lithium grease on the o-rings.

Don't worry about the design. Most injected engines use the floating type design.

Tony Berger
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post #3 of 4 (permalink) Old 08-19-2002
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Like Tony said... without the stick.... An EFT o-ring kit is maybe $30.. you'll waste more in gas if you dont. when you pull them off, make sure you get both O-rings... some like to stay wedged and can cause problems... Lithium grease over motor oil.. oil will cause them to deteriorate over time.
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post #4 of 4 (permalink) Old 08-19-2002 Thread Starter
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Location: Tampa Bay
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LOL Tony, I checked myself and put the carb back on the shelf.

Ok went out and got the o-ring's earlier today, I plan on puting it back together on wed when I have some extra time. I will let ya know how it turns out.

Thanks again

'88 GT 302 TT
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