Trouble when I punch it ...
 

Hey gang -

I just got my brakes all rebuilt and decided to go for a little spin in my new toy. It took me a little while to get her started, but when I did things seemed to be tooling along just fine. When I went to put it in gear and pull out of the garage ... stall. Repeat x 10.

I took the inline fuel filter out of the line from the fuel pump to the carb - and it was ridiculous. I went over to napa and got me a fresh filter. Popped it in and she fired right up and started to move. I was really feeling accomplished at this point. Until I got out on an abandoned stretch of road and punched the accelerator and it bogged down and almost stalled. I can add throttle slowly and it will pick up speed just fine, but if I try to pour it on too fast - no can do.

Any suggestions for a newbie like me? Am I going to have to learn how to rebuild a carburetor or does this sound like something you have heard of before?

Re: Trouble when I punch it ...
 

here are a few places to start.....check your timing. and check yuor carb adjustment. how do your plugs look? is the gas new?

just a few things to consider.

Re: Trouble when I punch it ...
 

Did you check that filter again? May have lines that are rotting or a bunch of deposits in the tank that decided to break free. Also did you do anything with the booster? Maybie there is a vacume leak now?

Re: Trouble when I punch it ...
 

dirtboy488 beat me too it I was going to suggest vacuum leak

Re: Trouble when I punch it ...
 

A few more details about the truck may also help get you pointed in the right direction.
Did the truck set up for a long time?
Has the tank been cleaned?
Have you checked the "sock" on the fuel pick-up in the tank?
As stated above,are all vac lines hooked up or plugged?
Is the vacuum advance working or maybe leaking air thru a bad diaphram?
Just some initial thing to look over and think about.

Re: Trouble when I punch it ...
 

I agree. More details. What kind of carb. Fuel pump? Stock or electric.
Sounds like fuel related issue.

Re: Trouble when I punch it ...
 

Thanks for the suggestions guys ... I will check each one.

It is a 350sb from 1980 that was placed in the GMC. The truck sat for a good 5 years prior to me purchasing it. There is no power brake booster, so I don't think there would be a vacuum leak associated wit that.

However - the tank has not been cleaned. There seemed to be about a 1/8 of a tank of fuel in the tank when I bought the truck and I put some SeaFoam in the tank as well as about 1/2 a tank of fresh gas.

The truck has a manual fuel pump that is working great - so I am guessing it is either a problem with the quality of the fuel or a carburation issue.

I am guessing that I should probably learn how to clean a gas tank. :)

Re: Trouble when I punch it ...
 

Still wondering what kind of carb. Maybe quadrejet 4 barrel. Quadrejets had a filter inside the fuel inlet. Could be still there and plugged.
To fast of an opening on a secondary air valve on a quadrejet can cause a huge bog too. Let us know about the carb.

Re: Trouble when I punch it ...
 

I am actually unsure of what kind of carb it is. I will take some pictures this afternoon when I get down to the garage and post them later.

Re: Trouble when I punch it ...
 

Similar thing happened to me this weekend;

driving down the road when it just seems like I run out of gas. I knew I wasn't out but pulled in the gas station and put a few gallons in. Start up and start back home and the same thing happens. I tow it home but I can tell it just isn't getting fuel. I replaced th inline filter a couple of weeks ago. Do I start at the tank and work forward or change the pump? What is the easiest way to get to the sending unit/sock pick-up. This truck sat for several years and I just recently started driving again. It has run strong and the problem came on all of a sudden with no indication anything was going on.

Re: Trouble when I punch it ...
 

Since they sat for a while I would rebuiild the carb