As with any step forward, there's always some new challenges. Let's take yet another look at the 6.9/7.3 most famous Achilles heel...the injector return line cap and o-rings system. With the lack of "lubricity" from the older fuels, the o-rings and return caps have been a problem point where any servicing under the hood that brings you to "accicentally" contact the return line and cap system, would result in the return lines to start to leak. At worst, you'd have fuel leaking all over. If you have been buying the return line kits or injectors from "Typ4" a newer synthetic rubber o-rings was added to the kit. The upside is the newer o-rings didn't degrade as quickly compared to the older ones. But the newer o-rings have their own issues too. The material is a much less pliable "rubber" and didn't stretch as easily. Also, the o-rings was very sensitive to getting nicked from the sharp edges of the injector threads. It took a while, like five or six trucks to where I figured out a system that works simply and consistently with the newer o-rings. a two inch long segment of PVC hose with a diameter wide enough to go over the injector threads and the other end of the tube is slit so the hose can take up the orings and expand them to easily get installed over the main body of the injector. Here's a quick tip....when using the hose, resist the urge to stack o-rings on the PVC hose. Left stretched on the hose, the o-rings will take a set and will not return to original sizing. pics are worth a 1000 words, so here they are.......
Lastly, i spray the o-rings with a silicone lubricant so the plastic caps easily snaps over them without much fight.
that is all...
Lastly, i spray the o-rings with a silicone lubricant so the plastic caps easily snaps over them without much fight.
that is all...