Question about 1988 Honda Prelude

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Leaks at the filler neck - 1988 Honda Prelude

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There is a small diameter hose that is used for a vent when you fill-up. It is probably disconnected from the main tube (open to the atmosphere). It will fail emissions inspetion aand appear like a leaking gas cap seal.

Posted on Sep 25, 2009

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Posted on Jan 02, 2017

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Hello, and welcome to FixYa. Please allow us to assist you.

You have a verry common condition; we see this quite often.

The codes you mention are usually caused by one (or a combination) of the three things that follows.

1. You do not have the 'factory' fuel tank cap fitted to the car; 'Aftermarket' fuel caps do not seal properly, and the leak of thefuel fumes under the cap will light the light.

2. The o-ring that seals the cap to the fuel filler neck is worn, or otherwise compromised, which will also allow the fumes to escape and light the light.

3. There could be rust on the filler neck tube, which would not allow a tight seal between the cap
s o-ring seal and the filler neck.

I would recommend replacing the fuel cap with a factory replacement, and inspect the filler neck sealing surface for rust buildup. If you see rust, a replacement filler neck will be in order.

Thanks for choosing FixYa fo assistance today.

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there is a small filler neck in frt. of the trany , with red cap on it. Brake the cap , there will be a plug under.
Proccedure : engine on idle , take of plug at the bottom of trany oil pan(with engine on idle!!!!! , if engine off , fluid will leak out) , use transfering pump to pump oil in to filler neck untill it starts leaking from bottom plug , wiat till it only drips , put bottom plug back in and torque it. Now you can shut engine off and seal filler neck.
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I have fuel leaking from the filler neck. Is this


sounds like the fuel tank is building up pressure because of gas expansion. See if the fuel vent line is bent or kinked, if this is o.k change your fuel cap.

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your best bet is to replace the fuel filler neck. the entire fuel system is a calibrated emissions system, meaning any changes to the specific setup may set a check engine light. you should be able to purchase a new fuel filler tube at your local dealer, not sure if parts stores carry those kind of parts. but you can try them too.

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