90 S4 Fuel Leaking

[Mat 71]

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

[Damstrom]

Fuel return is under the air filter box. The "U" between the left/right side also possible.


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[harborman]

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.

[Mat 71]

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

[harborman]

Originally Posted by Mat 71

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.

[honerboys]

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

[Mrmerlin]

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

[BoxsterGT]

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

[harborman]

I believe 928srus have hoses as well with clamps.

[Mat 71]

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

[harborman]

Originally Posted by Mat 71

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.

[BoxsterGT]

Its been a while. Have you cleaned the area and found the leak?

Inquiring minds want to know.

Len

[Mat 71]

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

[Mrmerlin]

Mat your a turkey, Happy Thanksgiving!

[Mat 71]

Well, finally got around to this on the weekend! Turns out it was easier than anticipated which was good!

Got some new fuel line and all is good!

Pic attached of the culprit!

On to the next project!

Thanks for the help to all who chimed in.

Mat

[Mrmerlin]

Mat that engine needs an intake refresh the other fuel line also needs to be replaced,
the crank sensor looks like its ready to crumble