[awhite4557]

I used the same Russell Quick Disconnect Fuel Fittings for my fuel rail when I installed the fuel lines in my 5.3 swap. Shortly afterwards, I started my PU and the preasure line came off when the pump preasured up. The plastic retainer clip stayed on the fuel rail and the fitting came off spraying fuel all over my engine. Luckily, my engine was cold. If this had happened while I was driving, it could have caught fire. At first I thought the fitting just wasn't seated correctly and re-installed it. It re-installed fine and re-seated correctly and did not come back off since I added a zip-tie to ensure it didn't come off. I was going to just replace the preasure fitting with a new one and when I checked the LS1 website, I came across a post listing this same problem. It appears this is becoming a common occurance with mostly the preasure side Russell quick Disconnect fitting.

I found out that Russell has a new style fitting that has a screw on c-clip retainer and will not come off. The fitting part numbers are 644120 (Summit #RUS644120) for the 3/8 preasure side and 644110 (Summit #RUS644110) for the 5/16 return line.

I called Summit and at that time, they did not have the part numbers in their system. They called Edelbrock and got the part numbers and I ordered both fittings and have replaced the ones I originally installed.

You may want to consider replacing the fuel rail preasure fittings with the newer style to prevent this from happening. Here is a photo of the new fitting.