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You have 2 basic questions. One about installing a pressure gage and one about a check valve in the fuel system. Your first question caused a bit of confusion because it was not clear you were thinking about installing a small gage on the fuel rail. Though many have done so, It really doesn not add a lot of value, and the install can be problematic.
There are two gages in the photo above. The blue-face gage is a fuel pressure test set about $40. The lower one is what many use as a permanent install. The permanent install can damage the aluminum fuel rail because you need a lot of torque to seal, and the schrader valve is removed. The assembly also vibrates and can fatigue crack. I would suggest you NOT install a small gage, It does not add troubleshooting value, and you have to put an eye on it, so the hood has to be up.
I suggest getting a good test gage and look for pressure drop.
Now the check valve question. To my knowledge there is no check valve on the fuel rail, and I did not see one called out in the fuel tank system parts diagram. There is a fuel pressure regulator on the fuel rail, and it may SERVE as a check valve, but probably only when the rail pressure is at or below the regulated pressure. Attached is the parts pages for the fuel rail FYI.
It is understandable whyC5-Diag misunderstood your question. It was written to suggest you wanted to solve a problem. You may want to reflect on your later remarks....
My suggestion is to get a FUEL TEST rig and ask here how to troubleshoot your system. You may actually find the problem (though it may mean a fuel pump which is not a fun project).
I agree with you about rethinking his last few comments. This is a great forum, made great by exchanging information. Accurate info. Sometimes people come across differently than intended, like a cell phone txt. There's no emotion in them, unless it's spelled out. I have also made contradictory statements in the past. Unintentionally, of course. I've found that the more quantitive, and accurate info you give, the better equipped the members are going to be who can help. One other thing that makes this forum great. VERY knowledgeable, giving people. Bill Curlee, C5 Diag, GCG, and many others are really good people. Actually, C5 Diag has a real good point on the cam sensor. My car had a broken wire on the cam sensor harness a couple years ago, and it started very hard. I thought it was excess fuel. The car would eventually start, which made me think leaky injectors were flooding it, as after 5 or 6 seconds of cranking, it seemingly cleared out and started. If you happen to be driving when a cam sensor wire breaks, it changes nothing. The car still drives fine, because the cam sensor only contributes its function at start up, to "tell" the PCM which cylinder is going to fire next, and thus the injectors are now going to fire in proper sequence. We are all lucky that guys like C5 Diag have so much equipment, and luckier still he, and others, are willing to share their knowledge.......
Last edited by grinder11; Sep 12, 2020 at 02:17 PM.
