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Old 04-26-2005, 19:01   #1 (permalink)
Wendy & John
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Fuel Leak: 86 Lincoln Mk VII 3.0 FI

RE: Fuel Leak: 86 Lincoln Mk VII 3.0 FI

Fuel odor comes thru heater vents when idling,
disappears when moving. I can not find any
wet spot anywhere under the hood or between
the fuel tank and the engine compartment.

One person says it may be a leaking O-Ring at
one of the injectors, but I can't see the injectors
because a cast aluminum intake plenum, shaped
like a giant rectangular mushroom, covers them.

Can anyone give me some hints:

1.) If I get the plenum off, how can I pressurize
the injectors to look for the leak.

2.) Why is a big plenum needed instead of a simple
small box between the throttle body and the maniford?

Thanks,

Wendy & John.
____________________________________________



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Old 04-26-2005, 20:01   #2 (permalink)
icouldv8@siomd.com
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Re: Fuel Leak: 86 Lincoln Mk VII 3.0 FI

On Wed, 27 Apr 2005 00:43:59 GMT, "Wendy & John"
<ardanswj@kilobar.net> wrote:

>RE: Fuel Leak: 86 Lincoln Mk VII 3.0 FI
>
>Fuel odor comes thru heater vents when idling,
>disappears when moving. I can not find any
>wet spot anywhere under the hood or between
>the fuel tank and the engine compartment.
>
>One person says it may be a leaking O-Ring at
>one of the injectors, but I can't see the injectors
>because a cast aluminum intake plenum, shaped
>like a giant rectangular mushroom, covers them.
>
>Can anyone give me some hints:
>
> 1.) If I get the plenum off, how can I pressurize
>the injectors to look for the leak.
>

jump pump relay
> 2.) Why is a big plenum needed instead of a simple
>small box between the throttle body and the maniford?
>


to "stack the air"



foctard


hurc ast
>Thanks,
>
>Wendy & John.
>____________________________________________
>
>


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Old 04-26-2005, 20:01   #3 (permalink)
Sharon K.Cooke
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Re: Fuel Leak: 86 Lincoln Mk VII 3.0 FI

It probably is an o-ring leaking on one of the fuel injectors on your 5.0 (302
cid is more at 4.9L, actually). The car is coming up on 20 years old. Just
replace all the injector o-rings. Not really something for a beginner to do;
take it to a reputable garage.


Wendy & John wrote:
>
> RE: Fuel Leak: 86 Lincoln Mk VII 3.0 FI
>
> Fuel odor comes thru heater vents when idling,
> disappears when moving. I can not find any
> wet spot anywhere under the hood or between
> the fuel tank and the engine compartment.
>
> One person says it may be a leaking O-Ring at
> one of the injectors, but I can't see the injectors
> because a cast aluminum intake plenum, shaped
> like a giant rectangular mushroom, covers them.
>
> Can anyone give me some hints:
>
> 1.) If I get the plenum off, how can I pressurize
> the injectors to look for the leak.
>
> 2.) Why is a big plenum needed instead of a simple
> small box between the throttle body and the maniford?
>
> Thanks,
>
> Wendy & John.
> ____________________________________________

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Old 04-26-2005, 22:01   #4 (permalink)
Wendy & John
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Re: Fuel Leak: 86 Lincoln Mk VII 3.0 FI

RE: Fuel Leak: 86 Lincoln Mk VII 3.0 FI

Wendy & John wrote:

1.) If I get the plenum off, how can I pressurize
the injectors to look for the leak.

2.) Why is a big plenum needed instead of a simple
small box between the throttle body and the manifold?

Sharon K.Cooke wrote:

Take it to a professional and replace all the injector
O-Rings. You have a 5.0, not a 3.0 .


icouldv8@siomd.com wrote:

Jump the pump relay to pressurize. The plenum is there
to "stack the air."
____________________________________________________


DOH! You spotted it. You are right. It is a 5.0, and I
mis-typed it. Thanks to both of you for the comments.

Wendy & John.




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