jwyatt8171

Anyone sell just an adapter? I have a 100 psi filled gauge already. Just need an adapter to go to 1/8" npt thread.

Speedtoys

Your fire.

But..Roger used to sell those, not sure if he still does.

Red Flash

My opinion is that nobody should use those things. I think they are a fire hazard. But maybe that's just me. One sees plenty of them when one looks around...

Ducman82

I'm sure the guys that took their gauges off due to all the car fires will have some laying around. best to leave it off and test as needed.

69gaugeman

This.

If you really want to know use a specially designed pressure sensor and a gauge in the cockpit.

joehelendetroit

928mototsports out of Wisconsin sells the fitting.

jwyatt8171

I could just run some poly tube inside the cab to a gauge, right? LOL JK

I just need to see my fuel pressure to set my FMU correctly. Then it will most likely come off. I don't like the look of the fuel rail without the cover on it.

I will call Carl to see if he will sell me just the adapter without the gauge.

Speedtoys

..which will use the same adapter.

ROG100

Stopped selling them - I sleep better at night 8>)

dr bob

If you plan to use it for testing only, more power to you. There have been several fires reported from failures that resulted in fuel spray in the engine bay. That's why you aren't getting guidance on the fittings.

jwyatt8171

So, without the adapter wha do I use? I see fuel pressure test kits, but will the fittings be right for the porsche?

ROG100

Just buy another fuel rail nut and drill 1/8" NPT.

dr bob

It's not quite that easy. The original fitting depends on a steel ball bearing to mate up with the flared end on the fuel rail, providing the seal. The threads are straight onto the rail, so there's no sealing available from them. Some foilks have put layers of Teflon tape on the rail threads, hoping that would be enough to seal. It might be "good enough" for a quick pressure test on a cold engine, but not suitable for longer-term use, like using it to support FMU tuning under extended load.

I drilled and tapped a stock cap to accept a very common GM fuel pressure test connector, and use a commonly-available gauge on a short hose when I need to check fuel pressure. The GM fitting uses a 1/4-28 straight fitting, and I added an o-ring where the hose now butts up against the cap. Inside the threaded rail cap, a 1/4" brass tubing ferrule sits over the stub of the fitting that passes through the cap, effectively replaceing the ball-bearing duty while allowing fuel to pass through to the gauge port.

Theoretically, since the ball bearing does the original sealing at the flared end of the rail, you could easly drill & tap your existing rail cap, then install it again with the original ball seal after testing is done. Theoretically. For me the cap was cheap and an easy add-on to a parts pick-up from 928 International, plus it gets used on others' cars a lot more often than on mine, so having a dedicated piece in the gauge kit made more sense for me.

69gaugeman

You should NOT just tap the cap nut. You must seal on the flange inside, hence the ball bearing inside.

There are many ways to do this. I took a fitting from my fuel line test kit and drilled out the cap to accept it. Sort of like a ferrule. It has a quick change end that seals so I can just pop the fuel pressure gauge on whenever I need too.

Speedtoys

What you need is a fuel rail that has been modified to have a 1/8" NPT port on it, for such a pressure analysis device.

..I have one..