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90 S4 Fuel Leaking

Hi all,

I have a significant fuel leak coming from somewhere around the firewall side of the engine. See pictures which will hopefully help for reference.

Here's the story....

Car started at the beginning of the summer (May) without issues. After moving it around a bit and drive around the block the leak started as best I could tell.

I put the car on jacks and it has sat there since then. Haven't had a chance to look at it...various reasons unfortunately!

Had a look this weekend, but can't seem to see where the leak is originating.

The car start fine...let it idle for 30 seconds or so and the fuel is now significantly leaking where I have taken pictures of. I can only assume it is above this plate?

Any thoughts would be greatly appreciated.

Mat
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Old 09-18-2017, 10:39 AM
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Fuel return is under the air filter box. The "U" between the left/right side also possible.


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Old 09-18-2017, 07:56 PM
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Looks like a good leak. Time not to fool around but check it out. There is a fuel cooler against the fire wall and a number of fuel hoses which you might have to replace.
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1986 928S
32 valve engine
All stock, automatic, 539 Weissgold Metallic, 70K original miles, Hankook Ventus 2 tires.
Previously owned: 67 Vette, 427 L88 Stingray, 74 De Tomaso Pantera L
Old 09-19-2017, 04:53 AM
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Thanks. I did remove the air filter but as I suspected will have to keep going with the removal of times from the top side of the engine.

Have any pictures of what it looks like and what I might be looking for?

Thanks,
Mat
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'70 911T - my first - SOLD
'83 928S - fast becoming the daily driver - SOLD
'03 Ford Explorer Eddie Bauer - wife
'03 Cadillac CTS - daily
1990 928 S4
Old 09-19-2017, 01:50 PM
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Quote:
Originally Posted by Mat 71 View Post
Thanks. I did remove the air filter but as I suspected will have to keep going with the removal of times from the top side of the engine.

Have any pictures of what it looks like and what I might be looking for?

Thanks,
Mat
Is this your 83 model? If hoses are all original I would replace every one. I have an 86 which is different. You need to remove the air box to get at things.
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1986 928S
32 valve engine
All stock, automatic, 539 Weissgold Metallic, 70K original miles, Hankook Ventus 2 tires.
Previously owned: 67 Vette, 427 L88 Stingray, 74 De Tomaso Pantera L
Old 09-20-2017, 05:04 AM
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they are just rubber hoses - the ones with crimped on ends can be rebuilt - search forum for instructions - you can order replacement hose from our sponsor - a leak as bad as yours will be readily visible once you get under the air filter box - also check hoses back by fuel pump and injector lines - they are as old - i would not start car again until leak is fixed
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Old 09-20-2017, 08:55 AM
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NOTE you should have someone thats experienced with the 928 look at your car .

best bet replace the fuel lines in the engine compartment .

NOTE disconnect the battery.

dont keep starting the engine,
its a safe bet your ignition wires are also toast,
and it only takes one spark to light it off,
then your car will burn down the garage
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Old 09-22-2017, 02:13 PM
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I would suggest trying some leak trace powder after a thorough cleaning to help you isolate the leak.

The 928 fuel system is quite similar in components and layout to the 924 and 944. I have been building replacement fuel lines for the 911 and 924/944 models for many years.

This is part of what I offer for the front of 924/944 model along the firewall:



For these models the steel hardlines are cut at the floor and Metric compression ring fittings are used with crimped hoses, producing a correct, factory level repair.

A repair like this may be in order for your 928.

Please email me for info. NO pm's.

Len at Autosportengineering dot com

Old 09-26-2017, 11:11 AM
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I believe 928srus have hoses as well with clamps.
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1986 928S
32 valve engine
All stock, automatic, 539 Weissgold Metallic, 70K original miles, Hankook Ventus 2 tires.
Previously owned: 67 Vette, 427 L88 Stingray, 74 De Tomaso Pantera L
Old 09-26-2017, 11:31 AM
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Hi. Thanks for the responses...I appreciate it.

Someone asked if this was my old '83...it's not...it's the '90.

Might have some time this weekend to dig deeper as it is a long weekend here in Canada!

Thanks again. I will post if I find the culprit.

Mat
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'70 911T - my first - SOLD
'83 928S - fast becoming the daily driver - SOLD
'03 Ford Explorer Eddie Bauer - wife
'03 Cadillac CTS - daily
1990 928 S4
Old 10-05-2017, 09:15 AM
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Quote:
Originally Posted by Mat 71 View Post
Hi. Thanks for the responses...I appreciate it.

Someone asked if this was my old '83...it's not...it's the '90.

Might have some time this weekend to dig deeper as it is a long weekend here in Canada!

Thanks again. I will post if I find the culprit.



Mat
Hope you find that leak and I would not drive it until fixed.
I was just up in NW Ontario, flew into our lake with Rusty Myers in Ft. Frances. Had the entire lake to our group for 8 days, fantastic. Now headed to Lake Powell, Utah.
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1986 928S
32 valve engine
All stock, automatic, 539 Weissgold Metallic, 70K original miles, Hankook Ventus 2 tires.
Previously owned: 67 Vette, 427 L88 Stingray, 74 De Tomaso Pantera L
Old 10-05-2017, 11:42 AM
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Its been a while. Have you cleaned the area and found the leak?

Inquiring minds want to know.

Len


Last edited by BoxsterGT; Today at 04:48 PM..
Old 10-29-2017, 05:35 AM
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Thanks for checking in!

Have had no time to look in depth. Started snowing here in Canada so I have been replacing struts etc., on the winter beater which has been taking time and garage space!

Xmas holidays might be the time...I will post when I dig in!

Mat
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'70 911T - my first - SOLD
'83 928S - fast becoming the daily driver - SOLD
'03 Ford Explorer Eddie Bauer - wife
'03 Cadillac CTS - daily
1990 928 S4
Old Today, 04:34 PM
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