View Full Version : FI pressure gauge
11-13-2008, 07:21 PM
What do you guys do for checking the fuel pressure, do you have a gauge permanently mounted or do you have an add on fitting like the new cars have? I am using an aftermarket FI system and I think I only need to check the pressure at set up and then only for diagnosis, good day, Henry.
11-13-2008, 07:56 PM
My ramjet has a schrader valve on the fuel rail to attach a gauge. I though most rails had a place to put a valve. Just behind #4 injector.
11-13-2008, 08:43 PM
If your fuel rail doesn't have a Schrader valve, get one on it. But most have it.
Then buy a gauge to use when setting up and diagnosing.
I've seen some "permanent" gauges years back on TPI setups. I guess they screw right on to the Schrader valve. To me they looked like a potential failure point and fire hazard. You can only check the pressure when the car is motionless and out of gear anyway, there is no real practical difference.
11-13-2008, 08:45 PM
Thanks guys, good day, Henry.
11-14-2008, 08:56 AM
Aftermkt system.. Does it include an adjustable reg? If so, there's likely a 1/8"npt port on it. I use a 1/8" x -3AN fitting, and a cap.
The gauge I use, is made up w/ a line long enuf to get the gauge up onto the w/s,[I put it under the W/S wiper arm], so I can check the psi while driving. This allows me to verify the pump is performing at better than idle flow requirements. Once done, it comes off, and the cap goes on.. Done deal.
In the FWIW dept:
The line is covered w/ a length of clear fuel line, [hardware store stuff], installed B4 I put the hose together. This does 2 things:
1. Prevents scratches from the braid.
2. Insulates the braid, so it can't short against elec contacts, such as the alt...REMEMBER! Murphy is alive and well....
If for some reason you want to install a fuel pressure gauge in the vehicle please get yourself an electric gauge, don't run a fuel line into the passenger area...
02-24-2009, 08:39 PM
acardon, is the ramjet system from GM, I wonder if I can buy a fitting from them, I have been to a few auto supply stores and no one has replacement valves, good day, Henry.
02-24-2009, 09:31 PM
Yes, the ramjet is a GMPP engine. I have a list of GM parts that came with the engine, but the schrader valve is not listed seperately. It has the fuel rail listed as an assembly. The valve body is threaded into the fuel rail with what looks like a gasket type washer to seal it. You may be able to get the valve from a GM dealer seperately.
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