I have this fuel pressure gauge I found looking through my brother's stuff. I believe he uses it on his 93 vette. It screws on nicely to my Shrader valve (94 5.7 Z28), but there's obviously something missing - there seems to be nothing within the connection that pushes on the valve to release the fuel. Is there an adapter I need to get? Or a new gauge?

 

i have a liquid filled gauge up to 60psi, and i needed to removed the needle in the shrader valve and i have an adapter that screws onto the shrader valve, the gauge screws into the front of the adapter, and then there is a cap to seal off the top of the adapter...here are some pics...





hope this helps...

 

khojo16:
Can you please post a part# and vendor for the adapter you're using.
Thanks

 

lol i figured someone was going to ask that...lemme try to dig up the info on it...i bought it a while ago and dont remember off the top of my head

 

Thx... Just to be sure, the "needle" part of the valve is the part that pushes down, releasing fuel from the valve? How do I remove it?

 

i know i bought it from ls1speed.com, but im not 100% sure on the part number...
here is a link to the fuel rail T fitting they offer:
http://www.speedinc.com/cont.cfm?cid=C0000057

it looks a little different than mine, but maybe they just have the wrong picture up on their site..my contact was tom and his email is:
tom@ls1speed.com
and here is the note he put in the email about the part i have:
Note:
New Fuel Rail Adapter for NOS feed or Fuel Pressure gauge
1993-2008 Camaro Corvette Trans Am TBSS GTO LS1 LS2 LT1

 

there is a tool to remove the "needle" and yes you are talking about the right part of the valve..there is a tool called a valve core wrench, very small tool, and you can use it to remove the core/"needle" in the schrader valve

 

khojo16:
Is the LT1 schrader valve equivalent to a -4AN fitting? (or is it -6AN?)

 

-4AN

You can use a common tire valve core tool to extract the valve core... nothing special required.

Be carefull when attaching anything to the Schrader valve. The fitting is only swaged on the hard line, and will break off very easily. There are instructions for using a braided SS line to attach a pressure guage or pressure sensor. "Search" on the "Fuel and Ignition" forum... I know I've posted my writeup many times.

 

Injuneer:
"The fitting is only swaged on the hard line, and will break off very easily."
Thanks for the warning ... I was assuming the branch was brazed or soldered on. I think I'll cut into the 3/8" metal line just after the plastic fuel line connection and put in a quality 3/8" compression tee to gain access.

 

Not necessary. Look up ("search") my suggested method of making the connection, using a -4AN 90-deg swivel fitting such as the NOS #17585. It screws on easily, the "swivel" feature allows you to aim the fitting in the correct direction without over-tightening it, and the 90-deg bend gets the whole mess aimed away from the cowl.

Using a short hose after the swivel fitting allows you to put the guage where you want it, in a readable position, away from the heat and vibration of the engine.