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3.2 Carrera: Measuring Fuel Pressure?
Guys,
Sorry for the dumb question, but is there a standard diagnostic port available for tapping in a fuel pressure guage on the 3.2 Carrera fuel system? Where is it? Need to verify I'm seeing appropriate fuel pressure at idle to diagnose this low idle/stalling problem 
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Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition 
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11-26-2005, 05:01 PM
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abit off center
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On the Fuel rail at #1
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______________________ Craig G2Performance Twinplug, head work, case savers, rockers arms, etc. |
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11-26-2005, 05:16 PM
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Thanks Cgarr. Is a "special Porsche" fitting required, or any standard type fuel pressure guage will fit?
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Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
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11-26-2005, 05:28 PM
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Irrationally exuberant
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Quote:
-Chris
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'80 911 Nogaro blue Phoenix! '07 BMW 328i 245K miles! http://members.rennlist.org/messinwith911s/ |
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11-26-2005, 05:41 PM
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If I'm thinking of the same port there is a cap that unscrews at the end of the rail. Be careful as there's a ball bearing in there to seal. It'll fall out when the cap come off. It appears to be a standard metric thread but I'm not sure of size. Wait....let me go to the garage.......here.....
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Warren & Ron, may you rest in Peace. Last edited by RickM; 11-26-2005 at 05:54 PM.. |
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11-26-2005, 05:49 PM
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Here's what 89911 did. Not sure where he tapped in....
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Warren & Ron, may you rest in Peace. |
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11-26-2005, 05:52 PM
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M12X1.5 It's not the same as the fuel line fittings, even though the cap looks the same size.
89 911 ran a hose for the fuel tap to the fuel presure gauge. j.p. Last edited by jpahemi; 11-26-2005 at 05:56 PM.. |
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11-26-2005, 05:53 PM
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Great info! Thanks
 Is it a Male 14 x 1.5mm fitting? I'm told fuel pressure should read ~2.5bar (with vacuum on FPR connected) and ~2.8bar with vacuum line disconnected? EDIT: Oh, thanks Jp!
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Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
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11-26-2005, 05:54 PM
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Quote:
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Warren & Ron, may you rest in Peace. |
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11-26-2005, 05:55 PM
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Nice having the gauge there all the time. Might have to look at this mod.
JoeA
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2013 Jag XF, 2002 Dodge Ram 2500 Cummins (the workhorse), 1992 Jaguar XJ S-3 V-12 VDP (one of only 100 examples made), 1969 Jaguar XJ (been in the family since new), 1985 911 Targa backdated to 1973 RS specs with a 3.6 shoehorned in the back, 1959 Austin Healey Sprite (former SCCA H-Prod), 1995 BMW R1100RSL, 1971 & '72 BMW R75/5 "Toaster," Ural Tourist w/sidecar, 1949 Aeronca Sedan / QB |
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11-26-2005, 06:45 PM
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Yeh I like the idea of having that guage there permanently.
Can you just confirm whether I should be buying a 1/8" NPT gauge or 1/4"? My local auto shop has both, in stock.
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Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
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11-26-2005, 07:35 PM
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Quote:
I don't think a pipe thread would fit. |
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11-26-2005, 09:26 PM
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re: male fitting.... ???
just to be clear...the part "on the car" is a male fitting...and the "gauge part" ( replacing the "cap" that hold the ball bearing in-place) is female....correct ??? - Wil
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11-28-2005, 08:47 AM
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This sex stuff is confusing to me (and I'm 52), but the part on the hose that goes to the Gage would be convex (maybe male) and the part on the rail the ball goes into is concave (female).
Now if you look at the threads the internal threaded part is attached to the hose to the Gage and the external threads (male) are on the fuel rail. |
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11-28-2005, 10:39 AM
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Why can't one just screw in a mini fuel pressure guage directly onto the test port on the fuel rail (i.e: no hose)?
Is it a 1/8" fitting? The brass fitting on the guage I just bought is a 1/8" NPT. I'm hoping this will just screw into the port on the fuel rail 
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Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
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11-28-2005, 02:33 PM
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Merv:
It's a 1/8 NPT male for the gauge; the issue is finding a conversion fitting that has 1/8 NPT female with a 12X1.5 convex female fitting at the other side. I had one guy send me this fitting, but unfortunately it seems to be a custom part. The fitting is straight, from which I installed a 1/8 NPT elbow to the back of the gauge. j.p. |
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11-28-2005, 02:43 PM
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 I had my garage put one on when I was running a MAF that was tempermental with fuel pressures. It's an easy addition, just use some high pressure fuel line (stainless cable looks nicer) and use the proper connections. Make sure you use a glycerine filled gauge also to dampen the vibration. Originally I had a non filled VDO guage that failed quickly. You'll also want a fuel pressure regulator to make the adjustments. |
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11-28-2005, 03:17 PM
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Thanks for confirming guys
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Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
Last edited by WydRyd; 11-28-2005 at 05:19 PM.. |
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11-28-2005, 03:18 PM
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I just screwed a pressure tester to the test port and called it a day. I decided to leave it on there and have had no problems. I think I had a machine shop make one fitting for me. The car is in storage for the winter but I might have pictures at home on my pc. It is avery nice addition to have when troubleshooting etc..
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1973 arctic silver widebody 3.2 1979 sc white Targa(soon to be Talbot yellow) 2002 silver Audi allroad |
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02-01-2007, 11:54 AM
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The one I mounted to my car didn't have the oil/liquid filled display and over time, vibration killed my gauge
 I'm going to fit a new one on soon as it is a great diagnostic tool to have and can remain in place permanently 
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Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
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02-01-2007, 12:20 PM
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1969 and 1986 Porsche Targa and Coupe 1720cc and 3
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1985 Porsche 911 3.2 (Still in the stable)
1993 BMW 740 IL (Sold)
1985 Mercedes 380 SL (Sold)
1992 Harley Davidson Fatboy (Sold)
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