Where's a good link for testing fuel pressure?
04-12-2023, 05:44 PM
#1
Three Wheelin'
Thread Starter
Where's a good link for testing fuel pressure?
Can you expect to rent / borrow a fuel pressure tester at your flaps?
How hard is it to access that port?
How hard is it to access that port?
04-12-2023, 06:33 PM
#2
Three Wheelin'
Not all cars have the pressure port and its not consistent on the 996 near as I can tell.
In some cases you use a interposed T, basically you disconnect the feed line,
and a t goes in the feed line and rail that has a extra port for the gauge.
If your just testing the pump, it can be done on the gas tank end by disconnecting the
feed and hooking a gauge to the pump output. You only turn it on for 10 seconds to see peak pressure.
Oreillys has the gauge for rent, (free if you return it after use.. ) its their loaner tool program.
You may need to buy adapter fittings since the Porsche stuff is a bit unique.
In some cases you use a interposed T, basically you disconnect the feed line,
and a t goes in the feed line and rail that has a extra port for the gauge.
If your just testing the pump, it can be done on the gas tank end by disconnecting the
feed and hooking a gauge to the pump output. You only turn it on for 10 seconds to see peak pressure.
Oreillys has the gauge for rent, (free if you return it after use.. ) its their loaner tool program.
You may need to buy adapter fittings since the Porsche stuff is a bit unique.
04-12-2023, 08:42 PM
#3
Three Wheelin'
Thread Starter
Called O'Reilly's. They do have them. I read someone said it's a standard Schrader type valve access port. it was kind of deep and they needed extra threads so they used an air conditioner pressure gauge with deeper threading from Harbor freight. Should be passenger side on the fuel rail. Tried to do a search but didn't get any good hits.
Last edited by Otto Bonn; 04-13-2023 at 12:49 PM.
04-12-2023, 11:40 PM
#4
RL Community Team
Rennlist Member
Rennlist Member
The port is on the passenger side fuel rail near the middle and is covered by a brass cap.
It’s fairly easy to access.
You want 48psi while idling and 55psi when engine is shut off.
It’s fairly easy to access.
You want 48psi while idling and 55psi when engine is shut off.
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04-13-2023, 12:54 PM
#7
Three Wheelin'
Thread Starter
Thanks Tex.
Easy to access in the car? Pictures usually show engine out and then it looks really easy.
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04-13-2023, 01:05 PM
#8
RL Community Team
Rennlist Member
Rennlist Member
04-14-2023, 11:25 AM
#9
Three Wheelin'
Thread Starter
04-14-2023, 11:52 AM
#10
Racer
04-14-2023, 07:43 PM
#11
Three Wheelin'
04-14-2023, 08:29 PM
#12
Three Wheelin'
Thread Starter
What's up with the 993 part number you show in the photo? Is that for the valve or the pressure regulator?
04-14-2023, 08:37 PM
#13
Three Wheelin'
FWIW, I believe the Schrader in the fuel line is a "hydraulic" rated part, its o-ring is fuel rated.
That being said, when I check fuel pressure I remove the Schrader so my relatively large gauge gets a full volume
My gauge also has a bleeder valve so once I'm done checking I can bleed pressure off and remove the gauge with virtually no fuel spill..
I never remove a gauge from a hot motor whether the valve is in or not.. No car-be-que for me....
That being said, when I check fuel pressure I remove the Schrader so my relatively large gauge gets a full volume
My gauge also has a bleeder valve so once I'm done checking I can bleed pressure off and remove the gauge with virtually no fuel spill..
I never remove a gauge from a hot motor whether the valve is in or not.. No car-be-que for me....
04-14-2023, 09:39 PM
#14
Racer
04-16-2023, 01:45 PM
#15
Three Wheelin'
Thread Starter
FWIW, I believe the Schrader in the fuel line is a "hydraulic" rated part, its o-ring is fuel rated.
That being said, when I check fuel pressure I remove the Schrader so my relatively large gauge gets a full volume
My gauge also has a bleeder valve so once I'm done checking I can bleed pressure off and remove the gauge with virtually no fuel spill..
I never remove a gauge from a hot motor whether the valve is in or not.. No car-be-que for me....
That being said, when I check fuel pressure I remove the Schrader so my relatively large gauge gets a full volume
My gauge also has a bleeder valve so once I'm done checking I can bleed pressure off and remove the gauge with virtually no fuel spill..
I never remove a gauge from a hot motor whether the valve is in or not.. No car-be-que for me....
Good advice. I didn't know there was such thing as fuel rated Schrader valve. How do you find those? Probably a good idea to replace as long as you're depressurized. That O-ring can't last forever.