Boost Performance with Standard Motor Products SK9 Fuel Injector! Review

I've bought them 3 times, the first time with no problems, but the second time (for the 4.0 Jeep engine I'm working on) I only got 11 o-rings (should be 12 be), so this is my third time ordering them, they're cheap enough so it's not a big deal, but still very annoying. The quality is good but their QC seems to be lacking because I only got 11 when I bought them for the second time.

Good o-rings. I had to search the internet a bit to find that they fit my '99 Volvo V70 but yes a good set of rings and the included fitting cone were appreciated.

O-rings had to fit both the top and bottom of the injector. The bottom fit was fine, but the top o-ring was too small. My engine is a 2001 SOHC 4.0 that has a slightly larger o-ring on top. I order a new injector from my dealer and solved my problem.

Purchased to replace the original Jeep Cherokee 4.0 in the late 90's. There was an installation tool in the box which definitely helped prevent tearing. I used transmission oil to lubricate them to make installing the o-ring and fuel rail assembly easier.

This was listed as one for my Ford. When the injectors didn't fit back into the manifold I checked the old ones and these, and sure enough, the original had the smaller bottom ones (a different color too). This has been found to be the case for several Ford applications. Any parts store will try to sell you the same size o-rings for top and bottom, not offset as it should be. Also the dealer won't sell you smaller o-rings, just the whole injector. I had to drive across town to a fuel injection…