87 GMC Sierra R3500 7.4L TBI vacuum diagram

[DieselSJ]

Originally Posted by Captain J

———

For the speedo sensor is it behind the cluster? Do you’ve a picture?

So what I should do to fix Code 44?

I did order the electrical connectors, and I’ve a rebuilt kit, and I’ll work on it.

I’ll check the clicking to verify your diagnostic.
When you say ”if it still clicks when you have no fuel spraying then problem is with supply” what you mean?
Thanks

If the injector is clicking, it should be spraying fuel. If it is clicking and no fuel is coming out, then it means the fuel supply is plugged somewhere or air is getting into the system.