924Board.org

Dan924S · Joined: 04 Jan 2003 Posts: 26 Location: Boca Raton, Florida

I have yet to take open up the area above the filler neck, but before I do so I have a couple questions.

Is there a specific part that needs to be replaced? Whats the procedure?

Thanks

Also, anyone know any good porsche mechanics in the Ft.Lauderdale, Miami, or West Palm Beach areas with cost being the most important attribute?

CMXXXI · Joined: 05 Nov 2002 Posts: 1939 Location: Vicksburg, MS

The filler neck is a single-piece metal tube connected to the gas tank by a short length of large-diameter (2.5"-3") rubber hose. If you are smelling fuel inside the car then probably the hose has come loose or has a hole in it, there is a hole in your tank, the vent line has come loose or has a hole in it.

My '79 filler neck setup is different than a 924S (no fuel cap door), so I can't say for sure what is entailed to remove it. Can't be that hard though. Remove the rear carpeting and peel back some of the interior trim to gain access to the plastic shroud that surrounds the filler neck and connection to the tank. Take a peek to see if all the hose clamps are tight. There are probably 3-4 screws inside/behind the filler cap door that hold the filler neck to the body. Unless you have to replace the short length of hose, I can't see you having to remove the filler neck (unless of course the neck has rusted through, or the tank needs replacement - plastic, right?).
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'79 Eurospec 931

kabok · Joined: 25 Jan 2003 Posts: 179 Location: Ft. Collins, CO

In my case at least it was not the filler neck. It was actually the second hose. I think this one is the vent hose, connected to the main filler neck. Much smaller in diameter, maybe 3/4 inch. This hose is a cloth bound hose. The only problem is at least in my 77, 924 you can't take this smaller hose out without removing the whole tank, as the connection with the tank is hidden and can't be reached.

Zuffen · Posted: Fri Feb 21, 2003 9:09 am Post subject:

Much of the time the gas smell is the triangle shaped plastic tube under the car on top of the tank. The vapo comes up from the fuel filler neck cover or the gap in the rear seal by the key hole.

But the hose tightening is good plan.
_________________
Bob Dodd - 924turbo@cox.net
931 1982, 944 1982 euro, 924S 1988SE, 93 968 tip 06 Silver Cayenne S, 06 Black Cayenne S

I have Way too many cars, parts for the 931,944 and 951

Roger · Joined: 06 Jan 2003 Posts: 1235 Location: Cordova, TN

Never done it myself. Although I have seen posts and its not complicated. Just peel back the carpet and all should be clear.
_________________
1981 924 NA

Some people are like Slinkies. Not really good for anything, but you
still can't help but smile when you see one tumble down the stairs.

fredrikl · Joined: 03 Nov 2002 Posts: 73

Hi,

Having checked all visible hose clamps and hoses for leakage, I am now starting to suspect that the problem on my car (a 1982) is the triangular-shaped tube on top of the tank, mentioned above by Zuffen.

Zuffen, now the question is: is there any way of checking/tightening/replacing this tube without first removing the tank and transmission?

Best wishes,
Fredrik

Euro N/A 1982

Zuffen · Posted: Mon Feb 24, 2003 4:45 am Post subject:

NOPE

I have a gas tank I'll take a picture of which should give you guys an idea of what it looks like.

It is snowing today and we have about 8 inches on the ground from this morning
_________________
Bob Dodd - 924turbo@cox.net
931 1982, 944 1982 euro, 924S 1988SE, 93 968 tip 06 Silver Cayenne S, 06 Black Cayenne S

I have Way too many cars, parts for the 931,944 and 951

fredrikl · Joined: 03 Nov 2002 Posts: 73

Too bad... Just like I thought...

Pictures would be helpful, though.

Thanks,
Fredrik

positivesale · Joined: 12 Nov 2002 Posts: 126

i got my triangle shape white opaque plastic thing out by cutting through the trunk-then slipping it out. I am not sure what I would do if i had a brand new $100,000 car but on this one a saw and vice grips are my current tool.

I don't see cracks in the triangle. I blew into it with my mouth and held the other end with my thumb....no leaks.........put it back in tightened hoses on both ends. Possibly the smell is from the other end of the hose going into the tank, I don't know.

What I found though. was one hose with hidden leaks in it near the filler neck. TOPmost host, forced in bent awkwardly (by factory) Very bent hose, rammed right in there..bout 3 inches long. Sprayed water on the hose while blowing into another hose.
Procedure:
Pressure was upped in the tank by blowing into another hose with mouth. Then when spraying water on the hose I saw bubbles This hose leaked BEFORE the cap released pressure.

SO that is a good way to test for leaks, blow into a hose and spray other hoses with water....see bubbles all over near leaking hose

Problem is I still have smells so most likely other hoses have leaks that I missed, or a connection is loose on the hose that goes into the tank on the driver side from that triangle..NOTE: tank different on later models.Hose longer going to tank from Triangle (goes alllllll the way over to the driver side).Older tank goes to center according to PET (unverified)

I am losing hope in my fuel smell problem though-might be getting too many brain cells damaged while driving and while fixing this horrible mess.

(PS:Nowayinhellimremovingmytrannytopullthetank
David Frank gets mad when we cut/saw to access trannylink bushings bwahahahaha)
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82 931

Roger · Joined: 06 Jan 2003 Posts: 1235 Location: Cordova, TN

The gas smell can persist for awile. Raw gas smell is almos always the filler neck. If its an exhaust smell it could be your rear hatch seal.
_________________
1981 924 NA

Some people are like Slinkies. Not really good for anything, but you
still can't help but smile when you see one tumble down the stairs.

fredrikl · Joined: 03 Nov 2002 Posts: 73

My car is also haunted by this fuel smell problem. It usually appears on hot days, when the car first has been driven and then resting for 10 minutes or so.

I have an '82 Euro, with plenty of hoses and even a fuel expansion tank, so there are lots of opportunities for leaks. I have removed the filler neck cover, inspected all the hoses and tightened the clamps, but there has been no improvement. I was also suspecting the triangular-shaped plastic thing on top of the tank, but after reading the story above I doubt if it would be worth to check it.

Isn't there a typical place, i.e. a particular hose, fitting or clamp, where these leaks normally occur?

Best wishes,
Fredrik

dpw928 · Joined: 02 Nov 2002 Posts: 1860 Location: owasso, ok 74055

On Zuffens advise I just checked mine. Besides the filler hose and the 3/4" hose that connects to the filler tube, I have a small hose the runs to a check valve and back to the tank. Noticed that it was discolored on the lower section and upon removing the check valve it was obvious the hose was leaking. I couldn't just cut the end off due to the hose being molded to taper from about 5MM to 10MM where it connects to the check valve. I've spliced a new connection on, but I'm not sure if it will hold as the whole line seemed brittle. Anyone know the part number on the short line that runs back to the tank?

Dennis
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81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black