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Have you done anything to it otherwise? Is the lift pump good? Have you switched to a spin on style fuel filter? Is the smoke coming out of each tailpipe equally?

On top of the IP. There is a piece of rubber fuel line, disconnect it and unscrew the valve with a 9/16 deep socket.

Its hard to say. What kind symptoms are you dealing with? I broke the glass ball out of mine and it runs and pulls better.

That may be the return valve you are looking at. It takes a 9/16 deep socket. It's a short little valve.

Well I took the fuel return valve and broke the glass ball out. Now its running perfectly. It was full of rust colored debris. I will source an injection pump asap though because it must be going bad if there's that much crap floating around in there. Hopefully it will hold up for a couple...

Yes I thought that. I ran it without the air filter and there was no difference. I looked in the intake with a light but I can't see anything out of the ordinary.

I see it as blue, but it isn't oil its definitely fuel.

The problem I'm having ; I noticed the other day that I was losing power, and smoking a lot as I pulled into the driveway. I have replaced the lift pump with an electric fuel pump. I converted to a spin on filter and replaced all rubber fuel lines up to the injector pump. The truck starts OK...