Hi. This is my first post. I have a 1994 k3500 with the 6.5. I just got done with replacing the heads, injectors, and glow plugs. The truck fires right up but feels like it has a miss on one cylinder. It also rolls white smoke. Even when the truck warms up it stays white. The exaust smells like taw fuel. It is not losing coolant. Is an injector stuck open or what would cause this? Thank you.

 

Yes it sounds like an injector/injectors have you run injector cleaner through the system?

 

The injectors were rebuilt and pop tested by a local diesel shop. I have less than fifty miles on the truck since the rebuild so far. Would you still recommend the injector cleaner?

 

Is there an easy way to determine which injector is acting up?

 

Yes loosen injectors one at a time and listen to any changes and a can of Seafoam will do wonders and lube that IP as well.

 

After checking the injectors over they are fine. I put some clear hose on and am getting air in the fuel. Is there a likely culprit? I do not see any fuel leaks anywhere in the system. Would the air leak have to be before the lift pump?

 

sounds like a weak or bad lift pump to me maybe a low pressure hose deteriorated in the tank. IP is cavitating probably.
do you have a gauge for fuel pressure?

 

The lift pump is working. I can bleed fuel and truck stays running just the same. What should the pressure be? How low would it have to be to cause an issue? I get air in the fuel even at idle, i don't have to be on the throttle for the issue.

 

9-13 PSI is the only spec I see for lift pump pressure. The injection pump should be putting out 1700 PSI.
here is a PDF for the bleeding procedures.

bleeding 1994 chevy.pdf


there are some chevy guys on the forum maybe they will help.

 

Sounds like you need to get new fuel rated hose a drop the tank enough to replace the supply and return hoses then you will want to do the same to the IP and FFM (Injection pump and Fuel filter manager)there is a O ring in the bottom of the FFM now would be the time to replace it can get it a a local parts house you will have to take it in to match it up it is less than $2
and 12 volts from a battery to the G terminal will engage LP to aid in bleeding fuel system.

I tried to load a diagram of the ALDL port but it screwed up, But the lower left terminal is G.