[pzwerner]

Just got back Sun night from SCCA race at Gateway with my "new" 968, ( fastest lap of event, two poles, two wins !!! NOT with the 968 !!)). I usually have the cds on, but yesterday with everything off I hear a whine from the rear. It sounds like a blower,ect. I suspect it is the fuel pump. I really had not noticed it before, but maybe it has always been there. Doesn't change with RPM or MPH, it is a constant low whine. The car has 40,000mls on it, and I don't know if the filter has ever been changed. The car ran great the entire trip with no running problems. The 968 got about 28mph and the 180 ml trip took me 2.3 hrs.( just keeping up with traffic !!) Will a dirty filter cause the pump to be loud ??? I've run a couple of Techtron treatments since I bought the car in June. I bought the car with 37,000mls on a '93, so the car had little use and probably sat for a while between outings. From -previous experiance I know a Porsche needs to be driven OFTEN to stay in good running order, so I'n in the process of reduing everything. I'm planning filter change this weekend...



Paul Zwerner

Terre Haute, IN



PCA-30 yrs.

SCCA

Rennlist

356 Registry

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[flash]

not that it is in any way associated to the whine, but if you are in there changing the filter, there is a check valve there too, that seems to be an occasional issue that would be very convenient to change at that time

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[BruceWard]

Paul, the fuel pump is below the fuel tank. Changing the filter is less work than changing the check valve. But I would go ahead and do both at the same time. I did them at different times and it would have been easier to do them together.



Instructions, including pictures, are online at http://65.61.16.109/forum/topic.asp?TOPIC_ID=9386

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[flash]

pz - just sent you a pm

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[BruceWard]

Hopefully that PM says that Flash is flying to Terre Haute to change the fuel filter <img src="/forum/images/smilies/968/smile.gif" class="smilie" alt="" />



Although I would bet it says something really nice about me!

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[flash]

love to go there, but no - and no, nothing about you at all

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[BruceWard]

Well I lost that bet. Just did not understand why you said it privately otherwise.

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[flash]

because some things belong offline (like this conversation, actually)

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[Brian]

question for the smart people out there...

i've got a gassy smell in the cockpit first thing in the morning after the car has sat overnight.

i checked the connections at the fuel sender and set the black plastic cap over it nice and snug. i understand this is the most common cause for smell leaks.

i really don't think the smell is coming from the engine. i'm pretty sure it's coming from the rear.

could this check valve be the cause of a gas smell? i have a feeling there's a small leak somewhere in the fuel hoses in the rear or perhaps something isn't working quite right back there.

i've done the search on gas smells already, but i'm hoping for a simpler fix than replacing all my hoses!

there's never a smell once i get driving, just when it sits over night. (relief!)



thanks!

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[flash]

there are some hoses back there that may be unseated - i think somebody else just recently had and resolved this problem (roxy maybe?)

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[pzwerner]

Problem corrected !!!!! Changed out the fuel filter and the "whine" is gone... Pump must had to work too hard to get fuel moving !! I decided not to do the check valve since it wasn't giving me any leakback symptoms. Car starts fine hot or cold no matter how long it sits. I've got a spare valve, so maybe I'll replace it this winter just for something to do !!!!! ( After we rebuild the FC van Damien )...



Thanks for all the help... I'll be back with MORE question later.....



PFZ

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[astrojeff]

[quote name='Brian' date='Nov 2 2005, 01:04 PM']question for the smart people out there...

i've got a gassy smell in the cockpit first thing in the morning after the car has sat overnight.

i checked the connections at the fuel sender and set the black plastic cap over it nice and snug.  i understand this is the most common cause for smell leaks.

i really don't think the smell is coming from the engine.  i'm pretty sure it's coming from the rear.

could this check valve be the cause of a gas smell?  i have a feeling there's a small leak somewhere in the fuel hoses in the rear or perhaps something isn't working quite right back there.

i've done the search on gas smells already, but i'm hoping for a simpler fix than replacing all my hoses!

there's never a smell once i get driving, just when it sits over night.  (relief!)



thanks!

[right][post="12014"]<{POST_SNAPBACK}>[/post][/right][/quote]



Brian, Did you fix your gas smell? I'vd had this problem since I bought the car in 1993. Never did get it fixed completely. I have had hoses replaced and, recently the expansion tank replaced. I think it is coming from the tank, since I only notice it when the tank is at least 3/4 full. If I keep it to 1/2 or less I don't smell it. My service shop just tested the fuel ventilation system with some type of smoke that they injected, but could not find the leak.



I think that I will have to drop the gas tank, but apparently I have to remove the transaxel to do this. I would like to get rid of the problem, as it is quite annoying.



Jeff

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[frank moran]

[quote name='astrojeff' date='Mar 29 2006, 04:34 PM']Brian, Did you fix your gas smell?  I'vd had this problem since I bought the car in 1993.  Never did get it fixed completely.  I have had hoses replaced and, recently the expansion tank replaced.  I think it is coming from the tank, since I only notice it when the tank is at least 3/4 full.  If I keep it to 1/2 or less I don't smell it.  My service shop just tested the fuel ventilation system with some type of smoke that they injected, but could not find the leak. 



I think that I will have to drop the gas tank, but apparently I have to remove the transaxel to do this.  I would like to get rid of the problem, as it is quite annoying.



Jeff

[right][post="18220"]<{POST_SNAPBACK}>[/post][/right][/quote]

I had a similar annoying problem and it was the filler neck broken away from the tank, on curves or when filled it leaked badly. To see the area I'm referring to, you have to remove the right side rear carpet and you will see a cover with some screws and 2 nuts, remove this and you can see the filler hose and the tank . Others have said the sending unit in the tank leaked, this is under the rear carpet covered by a silver cover, peak in there, possibly leaking. Mine was loose also but not leaking. Yes you have to drop the trans to remove the tank.

PS the tank is plastic.

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[Etnier]

It's also remotely possible that the previous owner fell victim to a stupid car stereo installer, or something of the sort. I had a CD changer installed in a 944 and the crew drilled right into the tank.



Wouldn't hurt to peel back the carpet and look for holes...

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[ether_joe]

[quote name='pzwerner' date='Nov 5 2005, 03:25 PM']Problem corrected !!!!!  Changed out the fuel filter and the "whine" is gone... Pump must had to work too hard to get fuel moving !!  I decided not to do the check valve since it wasn't giving me any leakback symptoms.  Car starts fine hot or cold no matter how long it sits.  I've got a spare valve, so maybe I'll replace it this winter just for something to do !!!!!  ( After we rebuild the FC van Damien )...



Thanks for all the help... I'll be back with MORE question later.....



PFZ[/quote]



PFZ - I am getting a similar whine - as you said, it's almost not noticeable so much so that when I've tried to point it out to other 968ers locally they don't notice it.



I'm going to change my fuel filter and see if that also cures my issues.



right on thanks for the heads up. <img src="/forum/images/smilies/968/rolleyes.gif" class="smilie" alt="" />

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[Brian]

jeff-

i replaced my fuel filter and check valve.

the check valve is a bear to get out! when i had the fuel pump out, i cleaned it up the best i could.

also removed the sender and greased up the rubber gasket (not sure what use since gasoline will clean off the grease!).

the problem has definitely improved a ton. since i live in mich, i haven't really driven it enough through the winter to say that the smell is truly gone.



i also had someone recommend that i get my fuel injectors serviced. they are on the opposite end of the car, but perhaps they're leaking a tad and the smell is hovering in the car. my gas milage doesn't seem high enough. would go together.



the other thing i considered was replacing the three hoses in the rear by the fuel pump/filter. that's probably my next course of action if the smell doesn't go away. these parts are just so darned expensive!

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