Design Engineering Fuel Rail & Injector Cover Kit

My fuel rail was leaking so decided to replace it and saw this product and figured it to be a good idea. I’ve never had heat soak/vapor lock issues with my 4.0L but hopefully with this product I’ll never have to deal with it. Right from the box you can tell the heat shields are quality. The kit is definitely a bit pricy but well worth it because I didn’t have to modify any of the heat shields for my 02’ WJ. Instructions were clear and installation was a breeze. The only awkward part was putting the heat shields on the injectors but it all worked out. Overall, definitely worth it if your 4.0L runs hot and not to mention it looks pretty neat when installed.

Well guys it finally happened. We finally got our first hot enough day in Memphis, Tennessee to require A/C and test out my new fuel rail/injector insulation. The install went okay, I put it on a while ago while it was still cold outside. The injector o-rings it came with are a perfect fit. The injector wraps are a so-so fit. The manifold shield I did not use since my factory shield (they're identical) is still intact. The fuel rail fits like a glove once you figure out where to cut the damn thing to make it POSSIBLE to wrap around the rail. Cut a hole for your schrader valve if equipped. But when it's all said and done? It looks great and fits tight. So it's gotta work, right? UPDATE: July 7, 2019, Everyone I have to admit I was wrong when I first wrote my review. I removed the unnecessary bickering and have to apologize to DEI, you guys did a good job after all. I don't know why I previously had symptoms of heat soaking on a ~70* day with this first installed but now that we are well into the 90's I haven't had ANY issues whatsoever. A/C on, hot humid days stuck in interstate traffic, stop and go, very little airflow through the radiator, yet when I get home and shut the Jeep off, change clothes, and head back out for the gym; no vapor lock. I don't have any active fault codes and the only thing I've done to the engine since this install was I also replaced a faulty Throttle Position Sensor. Perhaps the failing TPS gave me SIMILAR symptoms to vapor locking that were affected by excessive heat while still driving and I just thought this insulation kit was to blame. I don't know, but I do know that I was wrong. I'm running harder and hotter than ever in Memphis traffic and getting absolutely NO vapor lock on any cylinder. So this kit is doing great and I wouldn't hesitate to go wheeling in a desert somewhere. I'll continue to update this if anything changes but for now, I highly recommend this kit! I had to come back here to eat my words so I can keep my feedback as accurate as possible. Plus, it's terribly simple to install. I'll add pictures soon. Thanks again!

I use my Jeep XJ to tow a small boat, so I am all too familiar with heat soak issues. I would leave it running on the boat ramp so I didn't have to shudder and shake, barely making it up the ramp. So far this kit solved the problem. I also added hood vents to keep the engine bay Temps down, but I'm sure this kit is enough to stop the heat soak problems. All the fuel rail brackets and holes lined up perfectly, except for the pressure regulator, but one cut with some scissors fixed that. My factory heat shield was totally destroyed, see photo, so the new one looks great. Top of the engine looks much better. I found it best to install the injector wraps after the fuel rail was re-installed. It was too difficult to line up the injectors with holes and connect the electrical connectors with the wraps installed. Overall a nice product. I will definitely save some fuel/wear and tear by not leaving the jeep running during stops.

Overall I was very satisfied with the product. I installed it on a Jeep 4.0 engine while replacing the fuel rail and injectors. Biggest frustration was installing the heat shield. It is fragile and a little tough to install without removing the wiring harness. In the end I did end up removing the throttle body to fit the shield adding to the time of the install. The fuel wrap cutouts were a little misaligned due to the release valve. When I cut around the release valve area it fit like a glove. With a little bit of modification, It is a great product and worth the hassle of installation. So far I haven’t had the same issue of the 3rd cylinder heat soak issue that is typical with the Jeep engines.

I have ran 2 kits. The cheaper kit you get on Amazon or eBay and this kit. The cheaper kit falls apart over 2 years. Heat shield if some sort of cheap material. The DEI is new and I am giving it a go. Right out of the box I can tell it's got better material and the main heat shield has a foam barrier and not some rubberized inner like the cheaper kits. The reflection kit is also nicer. As with any Jeep project, save the money for the nice kit. This kit comes with injector o-rings. I didn't use them as I had a set already available, but as an FYI.

This is definitely a well put together product, it fits REALLY well, almost too well, and it works. I was having a slight misfire issue in my XJ when I shut it down while hot and while wheeling and started it again without letting it cool down. This product seems to have helped with that a bunch. It didn’t completely fix that issue, but I’m sure there’s other aspects to that problem as well, it is a Jeep after all... The fit on the parts is really good, they definitely got their measurements right. The wrap on the fuel rail itself, though, is almost too tight. It was a little difficult to get it over the ports for the injectors on the short side by the fuel input. With some patience, it was certainly doable but some extra tolerance would have been nice. Overall, I’m very happy with it and I’m glad I did it. I was hesitant, but it’s been worth the money.

Spendy? Sure. Quality? Very much. I put this on a 1997 Cherokee 4.0, and I can say that vapor lock, hard hot start and the stumble on acceleration just after a hot start are greatly reduced. If it isn't, run alcohol free fuel, and replace the fan clutch. Cherokees are notorious for cooling issues when everything isn't perfect.

Fits almost perfect, anyone with a little sense can make it work. Great quality and keeps everything important a little bit cooler.

WELL PACKAGED TO PROTECT ITEMS BEING BENT LEAFLET SHOWS HOW TO INSTALL PROPERLY ALL ITEMS ARE OF QUALITY

Fast service

Queda perfecto

Installed in a 99 Grand Cherokee. No mods needed for the fuel rail wrap. Super handy it came with new injector O rings. Absolutely recommend it to others than want to keep heat away from the fuel system.

Well made