injector orings leaking?

[peakpower]

how can i tell if i have injector orings leaking or a leaking check valve on the hpop.my hpop resevoir keeps leaking down. It does smoke on the first start up of the day untill warmed up. is this normal for a cold engine. or is it my injector orings.Thanks

[Marty]

what color is the smoke?

[peakpower]

the smoke is blue ish/black.i was told today that i probally have a bad injector,but would this cause the hpop to leak down.i was thinking of upgrading the injectors anyways. but it would be nice if i new for sure the problem. thanks

[DirtyDiesel]

i had an injector o-ring leak on my truck and it drank just about as much oil as it did diesel. but it didnt smoke at all.

[djsdiesel]

What year is your truck. If it is 94.5-97. remove the fuel filter and drain the fuel out of the bowl. Then take a rag and wipe the inside of the housing. if it changes from a blackish to an aluminum color, your o-rings are leaking. This only works on a 94.5-97 because the fuel circulates back from the head to the filter on 99 and newer it doesn't If you have a 94.5 to 97 and havn't had your o-rings replaced most likely they are leaking. If you have a 99 and newer chances are they aren't leaking. The injector o-rings have been updated 5 or 6 times since the 94.5's the ones they use now seem to the ones that last. They have a pink o-ring in the center between the fuel and the oil gallies.

[DirtyDiesel]

dang dj sounds like youve done that a time or two

[djsdiesel]

I've probably changed over a hundred sets of injector o-rings, very common in those years. I've seen them so bad that half of the o-ring between the oil and fuel was gone.

[peakpower]

its a 2000 with a 175000 miles on it.if the injector orings are not bad then what causes the bluish smoke on 1st cold start up and what causes hpop to leak down. would bad injectors causes hpop to leak down or is that another problem.

[djsdiesel]

With 175,000 miles it could be a number of things, bad injector, I havent seen injector o-rings leak on a 1999 or newer, it is possiblle, How do you know the hpop is leaking down, is it the resevoir leaking down, there is a check valve in the resevoir, it could be low compresssion from dirt ingestion, You will probalby see a little smoke at start up. could have a bad glow plug not heating up one of your cylinders??

[peakpower]

i recently replaced glow plugs and relay.hpop resevoir does leak down,im trying to diag.either a bad check valve leaking or i was told the injectors leaking could cause the hpop to leak down also.i leaning towards the injectors but the truck still runs fine. it just has aproblem with the first start up of the day. slow to build oil pres unless i top off the hpop res. first.