Fuel leak after replacing injectors

[bigblockburb]

I have a 1997 GMC Suburban 2500 with the 454 L29 motor. Its a strong engine but way more of a b*tch to work on than the 5.7 ‍

I replaced the fuel injectors with the supposedly upgraded bosch injectors (stock ones had 8 holes, these ones have 4 holes??) I bought a refurbished set of 8 from ebay, and right away I noticed a split gap in one of the upper rings that go into the fuel rail, but i thought no big deal, its still got an o-ring below to seal it.

Put the fuel rail and injector+pressure regulator assembly back together and installed it,and jumped the fuel relay to test for leaks, no leaks from injectors or fuel rail. I started it up after reassembly (after fixing a disconnected ignition module couple crossed plug wires) and it ran strong and smooth and seemed to have fixed my stumbling, misfiring engine.

I didn’t notice til the next morning that there is a fuel leak, but only when it starts up, and then it stops or at least slows down when running. When i turn the key on and prime the pump is when it leaks most.

To me it can only mean either a leaking fuel line that I didn’t tighten all the way, leaking injector fittings that go into the rail, or a leaking pressure regulator, which i replaced brand new from ACDelco, but I would like another opinion on what seems most likely to be happening here.

 

[bigblockburb]

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Here is the split that Im talking about, thats the end that goes into the fuel rail. It was the only one like this and I put it up front so that it’s visible from the outside. But it doesn’t seem to leak. Could it still cause problems?

 

[bigblockburb]

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Here is a picture of the fuel lines, they are a huge pain in the ass to reach with the whole manifold installed so I can’t very easily test to see if its loose and it’s basically impossible to see without a endoscope. Does the back one look loose? Its not sunk as deep in as the top one judging by the thread count

 

[Komet]

You're going to have to get closer to pinpointing the leak to know for sure.

If you can't get a visual, put a glove on, prime the rail, and start feeling it up until you have a wet finger.

 

[Minn95Dually]

Last time I did that it got me into trouble.

 

[Schurkey]

"Prime" fuel pressure is higher than running fuel pressure, unless the throttle is whacked-open enough to kill manifold vacuum. No wonder it leaks more at prime.

Fix the O-ring you know is damaged. See if you can get tools on that flare fitting to check for tightness--or--watch for leaks there at prime.

 

[bigblockburb]

I ended up taking it all apart and it was the stupid acdelco fuel pressure regulator that was leaking no matter how I installed it, so i just reinstalled the old one, no more leaks