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You can borrow my gauge if you want. Seals via metal insert (no rubber o-ring), similar to how the cap seals with a metal ball.
Shoot me a PM with your address if you want me to send it to you.
Rich
Thanks.. i just got the new guage today, but turns out, it is NOT the same NPT size i need. i was expecting the same size that came on the 928M guage. now , i need a NPT 1/8 to whatever the next size or two up is ( i have no idea what the gauge i have is) if i can get a step up, i can use the fittings i have.
Originally Posted by dr bob
The tube gets glycerin only if there’s an isolating diaphragm. Used with corrosive fluids that would eat through the tubing. Otherwise it goes into the case to dampen vibration in the tube and limit fatigue failure from same. The fact that needle movement is also dampened is a fringe benefit. By your picture, the case has the dampening fluid in it just fine.
Try pushing a little air directly into the gauge, separated from the adapter. Unless the tube weld to the socket has closed up, pressure in the tube will try to unwind and move the needle.
Did you drop the gauge?
just tested the new guage. it responds to air pressure, exactly to the levels the air compressor says. the big gauge is dead. dont know what killed it, but its dead. maybe when glycerin leaked out, it also rusted or something. i dont know. any ideas of how to fit the small gauge to the larger fittings I have?
Mark, we recommend the fuel rail gauge only be used for diagnostic purposes and not left on the engine when you are done. You probably know that, but I'm just reminding others who may be reading this thread.
Although they are commonly glycerin filled and shock resistant, you don't need another excuse for a 928 engine fire.
Mark, we recommend the fuel rail gauge only be used for diagnostic purposes and not left on the engine when you are done. You probably know that, but I'm just reminding others who may be reading this thread.
Although they are commonly glycerin filled and shock resistant, you don't need another excuse for a 928 engine fire.
yep, totally agree.... tell me, and its been since 2008 when i got this through Murf, but why do i have 2 adapters? the brass one should fit the fuel rail. it even has space cut out, non what appears to be the 12mmx 1.5 thread side.........(and the part that goes on the gauge seems to be 1/4NPT) the chrome part fits in the 12mm 1.5 side of the brass piece with the female side fitting on the fuel rail. i dont recall why so many pieces, but i do remember leaks no matter how high i tightened... i think thats why i have two of the brass parts....... help!!
I have a new gauge but it has a 1/8 NPT. if i get a step up adapter to 1/4NPT it will fit on the gauge and then fit the brass parts.
i have no idea of the failure of the big gauge.... no matter what i do, no pressure makes the needle move. the new gauge is very sensitive.
yep, totally agree.... tell me, and its been since 2008 when i got this through Murf, but why do i have 2 adapters? the brass one should fit the fuel rail. it even has space cut out, non what appears to be the 12mmx 1.5 thread side.........(and the part that goes on the gauge seems to be 1/4NPT) the chrome part fits in the 12mm 1.5 side of the brass piece with the female side fitting on the fuel rail. i dont recall why so many pieces, but i do remember leaks no matter how high i tightened... i think thats why i have two of the brass parts....... help!!
I have a new gauge but it has a 1/8 NPT. if i get a step up adapter to 1/4NPT it will fit on the gauge and then fit the brass parts.
i have no idea of the failure of the big gauge.... no matter what i do, no pressure makes the needle move. the new gauge is very sensitive.
Our fuel rail gauges are supplied with a brass fitting that we have made just for this application. It has a NPT thread taper on one side for the gauge and is metric threaded from the other side for the fuel rail. A recess has been added to the fuel rail side to hold the supplied o-ring in place while you screw it on.
Your pictures almost show you have one of each (Murph's and our) gauge adapters. What is your question?
so, that answers part of my question. but why did they send two adapters and what is the chrome one for?
i just dont remember. i did remember the leak and the o ring i still have on the fuel rail for the brass fitting
the threads of the metric fitting (like 12mm 1.5) seem to be cut a little too loose. maybe thats why it leaked and thats why they sent a second brass fitting. not sure.
Originally Posted by Carl Fausett
Mark,
Our fuel rail gauges are supplied with a brass fitting that we have made just for this application. It has a NPT thread taper on one side for the gauge and is metric threaded from the other side for the fuel rail. A recess has been added to the fuel rail side to hold the supplied o-ring in place while you screw it on.
Your pictures almost show you have one of each (Murph's and our) gauge adapters. What is your question?
I found an adapter for a 1/8 NTP female to 1/4NTPmale. this allowed me to use the smaller gauge, but it also allowed me to fit the fuel sample port too. anyway, it fit on that silver adapter snuggly and onto the rail. found another issue that the vacuum port was not connected near the RRFR. so , reconnected that and the fuel pressure dropped from 50psi to 40psi during idle. (of course, this doesn't matter much for WOT operation)
I also found that its not an issue as the fuel pressure doesn't change from cold to warm up. also the fuel pressure didn't decay much . 30 mins, still at near 40psi.... so, no issues there.
10-30-2018, 03:41 PM
anyway, it fit on that silver adapter snuggly and onto the rail. found another issue that the vacuum port was not connected near the RRFR. so , reconnected that and the fuel pressure dropped from 50psi to 40psi during idle. (of course, this doesn't matter much for WOT operation)