Thank you RiffRaff for including the O-ring and the rubber sleeve; mine was disintegrating as I removed the return line. Installed the gold spring and definitely notice that the truck is running smoother and quieter. I did sprout a small leak at my drain valve though so definitely keep in mind, increasing the pressure will certainly find any seals or O-rings that are not in good shape. Thankfully RiffRaff has the fuel bowl kit which is next up for me.

Was super easy to install both O-rings were correct. My stock spring still had tension but was a little too short. Truck runs good. Can’t tell the difference but at least I know it’s in there.

Simple install- truck idled smother & seemed to run quiet. happy with purchase!

Seems more responsive now. Engine is stock with 6 position tune and 210,000 mi. now.

The best service

Easy to install, black spring yielded me right at 65 psi post-fuel filter. Helped to quiet idle and injector clatter

Great kit, has everything you need

I was skeptical that a tiny part could make a difference. I have a 2000 7.3 with 215,000 miles. I thought it ran well before this upgrade. Now, it is a different truck entirely. It has more power and better sounds overall. I used the gold spring. It's easily installed, but watch dropping the parts in the valley. I had some diesel on my fingers, and the housing and spring went flying as I was pressing to install the screws. Luckily, I was able to find them.

Have my 7.3 a new life. Better throttle response and faster to start. I think my old springs we very tired after seeing how much better it runs.