Ok i have to random lines one is a vacum line and the other is a fuel line and i can find where they go. The first 3 pics are from the vacum line and where it origenated from and the other is a fuel line under the A/C compresser at the front of the block on the driver side.

that there fuel line connects to the lil nipple on the injector right there in the picture

as far as the vac lines do you have egr and what trans do you have in her

LOL i could not see it i had to reach in with the camra

I think it is a 4l60. the line starts on the wall. I did find an open nipple under the air filter.

The fuel line is as previously stated routed to the injector nipple. It is for the fuel return to the tank. The tubing will run across the the front of the engine, attach to the front injector on the passenger side and then attach to a steel line on the frame that goes to the fuel tank.

Is this truck a 1/2 ton or 3/4 ton? The half ton will have a 700r4 transmission, while the 3/4 ton will have a turbo 400. 1/2 ton will have egr on top of the intake manifold and a epr valve on the driver side exhaust manifold. Both require vacuum to operate. Egr is best disabled to keep intake runners from sooting up.

Is this truck a 1/2 ton or 3/4 ton? The half ton will have a 700r4 transmission, while the 3/4 ton will have a turbo 400. 1/2 ton will have egr on top of the intake manifold and a epr valve on the driver side exhaust manifold. Both require vacuum to operate. Egr is best disabled to keep intake runners from sooting up.


There are a few 3/4 ton trucks that were made with the 700R4 and EGR/EPR. Just something to keep in mind...

So i should leave this tube as is.

my 1/2 ton 6.2 with a 700r4 the vacuum supply to the egr comes thru the bottom of the air cleaner housing . remove top air filter housing and look for hole on the clean air side of the air filter. that is where mine is terminated and pluged.