924Board.org

[endwrench]

Hey, I need to upgrade my fuel lines before I burn my car down! Anybody know what size the stock fittings are at the steel line (pressure side) on an NA in the engine compartment? what about the return side? Are these metric? Does anyone make an adapter so I can run AN fittings and lines? I'm horrible at plumbing and I don't want to buy a bunch of those expensive fittings I don't need. Thanks,

Todd
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'79 924NA. Rebuilt 9.5:1, MSDS header, Mega Squirt Injection, MJLJ-EDIS Ignition, 1.6L Whipple Charger and Intercooler, 10lbs Boost, 944 Trans, Custom HD Clutch.
"simsport" said....superchargers are better than turbos its official!....

[Min]

I was able to thread a an -6 fitting onto the return line, it seems to have sealed properly. I couldn't find a fitting for the pressure line. If I was you, I'd just cut it off and reflare it with a easier to find threaded tube nut of appropriate size.

Did you have a fuel fire?

Min
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Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting.

[-nick]

Hey Todd,
Are you talking about where the flexible lines screw into the metal lines? You can strip the old flex line off the barb and just hose-clamp on new fuel injection hose with good FI hose clamps. Works great for me. The 931 hose ID's are 5/16" feed, 1/4" return. I can't imagine the n/a would be much different.
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1980 931S
15psi boost, MS-II, EDIS, 951 IC, custom intake, Ford 5.0L throttle body, Forge BOV, WB o2, G31 w/LSD, 964 wheels, 968 rear sway, Bilsteins, 200# Welt. springs. A laptop, and a partridge in a pear tree.
1991 964 C4 Cabriolet

[endwrench]

Hey,

No fire, YET! Blew two lines since I put the new fuel pump on. Somebody up there likes me!

Not too worried about the return line (even though that is one of the lines that blew!) because there should be no real pressure there.

Re-flaring the existing lines seems to be impossible without pulling my SC so I dont think I'll be doing that anytime soon. Beside the fact the line is 10mm (.394") and I only have tools to flair 3\8" (.375"). Not sure how that would work out.

I may do as you said Nick and just clamp on some good line but I would like to keep the line 3\8" all the way to the rail if I can. I already have it set up for 5\16" line so this would not be a problem. It is kinda odd that Porsche used 10mm (~3\8") line from the pump all the way to the firewall then reduced it to 8mm (~5\16"). Your flow is no better than your smallest restriction point.

I guess when I think about it, my failure points were with the line itself rather than the unions so standard clamping shouldn't be a real problem. Thanks for the help.

Todd
_________________
'79 924NA. Rebuilt 9.5:1, MSDS header, Mega Squirt Injection, MJLJ-EDIS Ignition, 1.6L Whipple Charger and Intercooler, 10lbs Boost, 944 Trans, Custom HD Clutch.
"simsport" said....superchargers are better than turbos its official!....

[Min]

[andy 931]

i think they are m16 and m14 not sure of the pitch ill check tomorrow think its 1.5.
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1980 924 turbo blue/silver
1986 924s red
1988 944s black
1985 924 na blue

[endwrench]

[RC]

Hey Todd, been looking in to this myself and am quite sure Andy is correct here, at least on the return line. The supply line "sounds" right but havent had it off for a few years. It connects to a short piece of HP rubber hose to the fuel filter. Had this replaced and crimped professionally at a hose (hydraulic etc) franchise, Enzed.

The original early filters are M12x1.5 F out and the later replacement ones M14x1.5 F. Have fittings to both these threads to -6. Available here for $12. So supply line is no problem.

With the return line we need a M14x1.5 F fitting with I think a 45deg flare. This is not available off the shelf in OZ anyway. The -6 AN fitting is a 9/16 x 18 TPI (threads/inch) which is 1.41mm pitch. IIRC the flare is 37deg. Not sure of the thread angle offhand as I`m away from my data books and main computer at the moment but it wont be the same.

I have tried this fitting on the M14x1.5 return line and although it does screw in, it is sloppy. Haven`t applied any torque to it yet and tested the seal. The AN fittings are aluminium and probably may seal OK on a low pressure line.

Being somewhat a perfectionist especially considering the potential disaster, I am very interested in what you decide to do here. Am keen to purchase the correct adapter if it is available in the USA or one from you if you are able to cut both metric and imperial threads on your lathe. Hopefully though you will find the -6AN fittings seal satisfactorily.

Roger

[RC]

Todd, think i`m arse about here:

[endwrench]

Thanks Roger. My first intention was to get rid of the adater hose but I may keep it now. I already built an adapter that holds a 1\4" pipe fitting I can use to adapt to AN. I was just hoping to keep the line 3\8" the entire way but 5\16" should handle the HP I want to produce. Just being anal

Todd
_________________
'79 924NA. Rebuilt 9.5:1, MSDS header, Mega Squirt Injection, MJLJ-EDIS Ignition, 1.6L Whipple Charger and Intercooler, 10lbs Boost, 944 Trans, Custom HD Clutch.
"simsport" said....superchargers are better than turbos its official!....

[endwrench]

OK, pulled this from the dead for an updae of sorts. Not what some were hoping I'm sure. I'm not even sure what I did. I had adapted my original EFI fuel line to 1\4"pipe about three years ago and I really have no idea how I did it. This is what it looks like:


By endwrench

My hand is holding the flexible OE hose that goes to the OE fuel filter (remember this is NA) so the first fitting is part of that. The second fitting, I believe, is from the OE fuel filter that was on it. I think the third fitting is from the OE fuel line "from" the fuel filter. I drilled and tapped this piece for the 1\4" pipe fitting wich was originally a brass barb but is now an AN6 adapter. Doubt this will help anybody but I thought I would finish this thread.

Also note, this is not the most sanitary way of doing this. It works for my needs and does not leak but "trier beware ".

Todd
_________________
'79 924NA. Rebuilt 9.5:1, MSDS header, Mega Squirt Injection, MJLJ-EDIS Ignition, 1.6L Whipple Charger and Intercooler, 10lbs Boost, 944 Trans, Custom HD Clutch.
"simsport" said....superchargers are better than turbos its official!....