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I had pick up a used reman injection pump few days ago,, so took OS of it,,put it on and put back together and she fired right up,, has all her power back,, but idle a little loopy,, not bad,, thats why I asked about adjustment of OS,,, but tomorrow will try the new info,, and again thanks,, you...

hey buddy thanks for help! it was OS (optical sensor),,, I do have ??? is there adjustment on the OS for reason,,

which would I need to replace the OS or the OS filter if need to replaes

no I didn't bypass os filter, will that help,,, we purge the hole system! fuel looks good see no water or any other contaminates,,have my fuel pressure guage hook to it and releasing pressure to watch for air through there, but was good,,it could be 5 psi hard to tell on mind,,

did not find no leaks anywheres!!!

ok it has about 4 psi of fuel pressure,, I unplugged the crank sensor and it didn't start

anyway to test the OS, if we have good fuel pressure,, oh what would be consider good fuel pressure on this,, thanks again for all the help

yes when you clear code and unhook scanner and start it, it throws the code again

we put a new fuel pump on it

ok we'll check it out,, but you don't think it would be the injection pump

Pmd has been relocated! the truck is really my brothers but I am trying to help him out, since I am the one mechanically inclined just not a diesel guy, he change filter and no he didn't drain water, said he drain where filter goes! the hummer is all stock except for the moving of the pmd. he is...

I have cleared codes a couple times and bleed the lines,, where is Optical filter harness

was going down road when notice a lost in power, figured fuel filter, so change it and it wouldn't start, fuel pump wasn't coming on, so put new fuel pump on, running again but still wont run over 2500 rpm, engine light is on check code, throwing on code twice one mil and one pend, code# p0251...