924Board.org

[Dave951M]

Ok, before anybody says it, I did use the Search function and after wading through 13 pages of hits, none had and answer for what I'm looking for.

I was attempting to install a new fuel filter today (and flush the fuel system) and the fittings on the fuel dizzy side were frozen solid. There was no filter on the car as it sat for quite a while with the engine out. I drained the old fuel at the tank by removing the line from the intank pump and letting it just drain out. Put in some fresh and repeated. Jumpered the intank pump and while it makes noise, there's no fuel at the filter location. With both pumps running, presto, fuel. So, I'm fairly sure the intank pump is toast. Now for the issue at hand, the fitting on the fuel dizzy side of the fuel filter broke off the line (corrosion for sure) when I attempted to remove it. I'm thinking of replacing the entire stretch of line up to the connection in the engine bay with braided stainless or something that will hold the pressure. Has anybody actually done this and where did you get the metric fittings? AN fittings are easy to find, but does anyone have a line on adapters? Sorry to be a bit long winded here, but the realtionship between the problem child and PO has really POed me as I find more issues and have to deal with them.
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Dave951M
86 951 Guards Red (Gone but not Forgotten!)
82 931 Guards Red (under construction)

[Chrenan]

I'm watching with interest, I've had no luck. North American suppliers have a slim selection of metric fittings.
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1987 951 - M193 Version for Japan

[dpw928]

Dave,

IIRC the fittings are the same as on the CIS equipped 928's so you may be able to get good used parts from www.928intl.com which will adapt.

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

[Dave951M]

In doing some research through my sources, I think I"ve found some AN to metric adapters. Anybody sure about the thread pattern of the fuel filter? I think it's 14x1.50. If so, I think we have a solution for the crusty fuel line problem. There are some alternatives out there to braided steel that are much less expensive, work just as well, hold the same pressures, and most importantly, weigh less than steel. This stuff is in use by race teams and I'll post what I find out tomorrow if I know what the thread pattern is for the fuel filter.
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Dave951M
86 951 Guards Red (Gone but not Forgotten!)
82 931 Guards Red (under construction)

[Smoothie]

Those thread adapters that come screwed and glued into the 931.110.149.01 fuel filters are M14x1.5 at their male end and M16x1.5 female end.
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"..it's made in Germany. You know the Germans always make good stuff."


'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

[Dave951M]

I take it that the 14x1.5 end is on the side towards the fuel dizzy. So it would require a 14x1.5male/AN adapter there?
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Dave951M
86 951 Guards Red (Gone but not Forgotten!)
82 931 Guards Red (under construction)

[Smoothie]

No, the aluminum filters themselves have M14x1.5 female threads. The M14x1.5 male ends of the steel adapters that come with the filters are glued and screwed into the filter. These filter-attached adapters' M16x1.5 female ends are what the car's fittings screw into. As far as I can tell from your description, one of your M16x1.5 fittings broke - that's one of the flared fittings (male) that's on the line, right?
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"..it's made in Germany. You know the Germans always make good stuff."


'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

[Dave951M]

Actually, the fittings were frozen together and there was a crack in the line that the PO had patched over with some hose that was clamped onto the line. In attempting to carefully loosen the fittings from each other, the line didn't feel quite "right" for a solid line. I removed the hose sheathing it and found the crack. After finding that, I've decided to replace the entire section of line from the filter to the dizzy.

That's why I'm looking at replacing the entire line and using fittings that will adapt AN to metric. From what I've seen of the filters, I can't determine a difference between the 931 filter and more common (and less expensive) VW/Audi filters. Unless there is an integral check valve or something else special to it, why should we pay $32us for a filter v $12us for a comparable VW unit when the only real difference is the fitting because someone at Porsche decided to use that particular size? The filter on my son's Scirocco is also for CIS, why is it $12 v $32? As I'm seeing it, by changing to where I can use a common VW unit, I'll save $20 with each filter change. With my penchant for PM, the change will pay for itself in about 2 years, not to mention replace aging, corroding OE lines. The only real change I can see between filters is the area of the filtration element. With a comparable diameter filter from a VW with CIS, I can't see how it would make a difference anywhere but my wallet.
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Dave951M
86 951 Guards Red (Gone but not Forgotten!)
82 931 Guards Red (under construction)

[Dave951M]

Update-

Aeroquip 6AN flare to metric 14x1.5 (male) Part number- FCM2240 $8.50

1 needed on the fuel filter to adapt to AN6 hose.
maybe a second one on the other end to connect to the fuel dizzy.

AN6 hose-Startlite $9.50/ft Braided steel- $4.50/ft Socketless hose-$3.50/ft.

AN6 straight hose fitting FCM1012- $6

Projected parts needed- 2 FCM2240, 8 ft hose, 2 AN6 flare ends (female) FCM1012- cost would work out to about $74 in braided steel. Would also look mondo cool too.


What size fitting is used on the other end of the line going to the fuel dizzy?
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Dave951M
86 951 Guards Red (Gone but not Forgotten!)
82 931 Guards Red (under construction)