quentinc25
Junior Member
- Joined
- Sep 14, 2012
- Posts
- 12
- Reaction score
- 0
- Location
- Florida
- First Name
- Quentin
- Truck Year
- 1985
- Truck Model
- C1500
- Engine Size
- 305
I had an eldebrock on my 1985 GMC 305 that needed to be rebuilt. The secondary’s wouldn't open and it had tons of leaks. I decided to go head and get a rebuilt Q-Jet (M4ME) to install. The motor runs great now but the secondary’s still will not open. Going down the highway they just will not kick in. One thing I need to check when I have some else in my shop is to make sure when the petal is pushed all the way that I am at full throttle. I will also see if the choke is stopping it. There is a vacuum port that goes into the secondary’s valve on the passenger side. Looks like a T with a port coming out toward the front (currently blocked off), one going into the valve and another into the carb. Does this need to have a vacuum line attached and if so where? I thought the vacuum secondary’s used the vacuum created by the carb when the throttle is pressed and didn't need a vacuum line but just thought I would ask. Any hints or info would be greatly appreciated.