Quote Originally Posted by westerncorvette View Post
So we got our truck running good but one issue we encoutered was that we keep having to prime the system to get it to fire. It seems like its draining back into the tank. Once its running it runs fine.

Any thoughts? Should there be a checkvalve somewhere as there wasnt one in the 02 Duramax fuel sending unit we installed.

Thanks

Les
Drainback issues are usually due to a leak somewhere in the fuel supply line/filter and/or perhaps excessive vacuum in the tank (bad cap vent).

Jim