phyler
Jr. Member
Hey all, recently rebuilt my 2150. This is the first time I've gone through this carb and I've learned a lot. That said, I am dealing with two issues that I'm hoping to get help on.
Back history, I've owned this Bronco since the early 90's. A friend rebuilt this carb last in ~95. It ran well but had some quirks for sure. I had recently noticed a drop in fuel mileage so after doing the normal tune up, timing, etc. thought it would be a good time to go through it. Prior to going through it, I know the choke wasn't working properly. I did go through the various adjustments (thanks to YouTube for this) and it definitely helped.
When I cleaned it, I let all the parts soak in cleaner for about 2 days. Everything is moving freely from what I can tell.
The truck starts way easier now which is nice. Give it two pumps of gas and turn the crank and it fires right up. Prior, I had to crank for ~20 seconds before it would fire.
On to the issues:
1. This was happening prior to rebuilding. I would be going uphill and it would act like it was getting starved for fuel. It was hot so I figured it was a bit of vapor lock. Got home and realized it was the mechanical fuel pump crapping out on me. I replaced it then rebuilt the carb. The other day I was driving and it did it again (also while going uphill) but less severe. Guessing maybe a float issue?
2. When you first start the truck up, it will high-idle til it warms up. Fully expect this. Typically, after a min or so, I can blip the throttle and it will come down. (FYI, I'm running a manual NP435.) It was cool yesterday morning (~55 degrees) and after driving several miles, it was like while driving it would get stuck on high idle. Again, a blip of the throttle would bring it back down. Maybe the choke is closing on me? Or could it be the vacuum pull off? Other ideas on why this might be happening?
Thanks!
Back history, I've owned this Bronco since the early 90's. A friend rebuilt this carb last in ~95. It ran well but had some quirks for sure. I had recently noticed a drop in fuel mileage so after doing the normal tune up, timing, etc. thought it would be a good time to go through it. Prior to going through it, I know the choke wasn't working properly. I did go through the various adjustments (thanks to YouTube for this) and it definitely helped.
When I cleaned it, I let all the parts soak in cleaner for about 2 days. Everything is moving freely from what I can tell.
The truck starts way easier now which is nice. Give it two pumps of gas and turn the crank and it fires right up. Prior, I had to crank for ~20 seconds before it would fire.
On to the issues:
1. This was happening prior to rebuilding. I would be going uphill and it would act like it was getting starved for fuel. It was hot so I figured it was a bit of vapor lock. Got home and realized it was the mechanical fuel pump crapping out on me. I replaced it then rebuilt the carb. The other day I was driving and it did it again (also while going uphill) but less severe. Guessing maybe a float issue?
2. When you first start the truck up, it will high-idle til it warms up. Fully expect this. Typically, after a min or so, I can blip the throttle and it will come down. (FYI, I'm running a manual NP435.) It was cool yesterday morning (~55 degrees) and after driving several miles, it was like while driving it would get stuck on high idle. Again, a blip of the throttle would bring it back down. Maybe the choke is closing on me? Or could it be the vacuum pull off? Other ideas on why this might be happening?
Thanks!