Thread: hesitation

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I talked to some people at work and they all agreed with you that it was the fuel lines collapsing. I'm ok with that. and eventually I'll be replacing the valve springs when I install a new camshaft anyway, but if it was valve float it wouldn't stall the motor until I let up off the gas. My understand of valve float is that at the top end the valves aren't closing properly and there will be missing and maybe even backfiring.

Forget about the fuel filter. You don't see gas in it at idle with the hood raised because the carb bowl is full and very little fuel will flow into the carb. If you could see the filter with the car at speed, it would be full.

Richard,

Your first post was on the money.

Firebird,

Richard gave you some good advice. Did you ever check the fuel pressure? If you do what Richard said in his first post, you would determine whether or not you have a fuel problem. The trick to all of this is to eliminate possibilies one at a time.

Valve float can cause an engine to just "fall over" at higher RPMS.

Jack, you have PM.

when I first start it and drive around it stays full, right up until the time it stalls out.

Originally posted by techinspector1
firebird, you don't have a fuel problem, you have a VALVE SPRING PROBLEM......TRUST ME ON THIS !!!!!!!!!!

Jack, please go back and read this thread from the beginning.

Yes and it's just going to get worse until one or more break.

a'ight I'll look for a camshaft kit with lifters, springs, and cam. I'll put these on my 305 heads

before I go and spend a lot of money this weekend on a camshaft, lifters, springs, etc. I want to make absolutely sure this is valve float. For the first time today it did the same thing, but at much lower rpm. this time it occured around 2500 to 3000 rpms. Didn't do it everytime, but did it twice. Same symptoms same everything. The car felt like it was bucking if that makes sense. I've replaced the fuel lines, but I've noticed it seems to only occur when the car gets to 190 degrees.

Originally posted by NTFDAY
Yes and it's just going to get worse until one or more break.

And I should have added at lower rpm's. Eventually it'll suck a vavle, been there, done that.

firebird,

Folks are trying to help, but if you won't try what they recommend and give feedback, you're going to spend a lot of money for nothing. So . . . You've been asked this question three times, and have never answered.

Did you ever check the fuel pressure? If you do what Richard said in his first post, you would determine whether or not you have a fuel problem. The trick to all of this is to eliminate possibilies one at a time.

Firebird dude , you have been beating your brains out trying to figure out why your car falls on its face when your on the gas , so start at the fuel tank and check the damn sock in the tank ,if it is good and all fuel lines are good then check fuel pressure and if that checks out then you should check check cam and lifters , and the valve springs .

I've replaced nearly everything from the gas tank up. I never checked the sock in the tank, for me to get my tank down I'll have to remove the rear sway bar and possibly the rear end. I don't have a place to do this and that's not by my choice. Cops frown on cars on stand with parts under them on the side of the road. I had 4 weeks to get this car to move under it's own power or scrap it. I was planning on replacing everything anyway. I'm not trying to be hard headed, and I'm not stupid. This is the first carberated car I've ever dicked with. If it was an obd car I'd plug it in replicate the problem and go from there. I'm assuming I'm getting fuel pressure cause the car is a real screamer right up until it gets to 190ish. I'm planning on replacing the carb and the valve springs anyway this week.