This is my first post to this forum. I have 98 24valve that had a fuel leak on top of the fuel filter heater. I fixed the fuel leak, reprimed the filter and fired for two seconds then died. I cracked the injector lines to get the air out of the lines and have fuel to all of the injectors. The truck will still not fire, acts like it wants to start but won't. I have good fuel pressure to the pump and no codes until switching relays. Codes 1688 and 1689 came up only after playing with relays. Any help would be appreciated.

1st injector from front of motor correct ?

yes

 

Tried that. Got only a little fuel out of #1, not much. Still fuel out of #3 but not with the force I think we are looking for. If you think there is still air in the line I will continue to try. Runs off of starting fluid but the stalls out. I know that I was getting really yellowish color on the snow this winter when I would let it warm up. I suspected the pump for a while but wasn't sure. 

I finally replaced Injection pump. I used the instructions supplied from this site. The truck hasn't run this good in about a year. Thanks for all of the help.