I've about had it!

[rogergodding]

With my son's truck, that is..... stopped the air from getting into the fuel line, so I thought all is good..... Drove it up the street and back when it died again. Now it will only run for a few seconds if/after I poor gas down the carb..... It has a just purchased Q-jet that I saw running on a 350 before I bought it. The engine is a 305, hei, I know it's getting fuel thanks to the glass filter..... ideas?

[haysonj]

Need to pull the breather off and look in the carb while pumping the throttle to see if it squirts gas. You may have dirt or crap plugging the inlet.

[rogergodding]

it's squirting, I can hear it even....

[LockDoc]

-
I would say you have some kind of a restriction in the fuel delivery system or you are out of gas...

It's using the fuel in the carb bowl then dying.

Check the small filter in the carb inlet. If it looks a little brown change it.

LockDoc

[vectorit]

Check that HEI.

[rogergodding]

Thanks! keep the ideas coming... it is not out of gas for sure and.... the carb was just taken off of a running engine this afternoon.......

[haysonj]

If it will start by dumping gas in then it should start by pumping the throttle if it is actually squirting gas. I would still say you have dirt in the needle seats. You need to pull the inlet fitting and see if it even has a filter in it.

[LockDoc]

Originally Posted by rogergodding

the carb was just taken off of a running engine this afternoon.......

That doesn't necessarily mean anything. Running up and down the street would be enough to suck junk out of the tank and plug things up...

LockDoc

[Liddy71]

I would check the fuel that comes from the frame to the engine sounds like it closing off

[swamp rat]

If its getting fuel, the accelerator pump is pumping fuel into the carb then it may not be the carb.

What engine did you put the carb on? if its larger or smaller then the settings for the idle curcut and throttle may be off. Also if you have an intake manafold leak the that will make it run so lean that it won't idle as well.

[rogergodding]

Thanks guys..... I had driven it as much as 10-12 miles and it was fine.... then the most recent things like I posted... we bought this truck in Oct with issues of running a few minutes then dieing... so I put a glass filter just before the carb, so I could see what was going on in the line.... that's how I figured out that air was getting in there.... just before I put the newer Q-jet on it, the fuel line was completely empty, as I was checking the sending unit, etc.... I put it back together, primed the carb and turned it over several times.... at that point there was no fuel in the glass filter... as I removed the hose clamp on that filter, it began to fill up with fuel from the pump side... as if the carb/engine were completely blocking fuel/air, anything coming up the line.....

[chipflyer]

Very common to get the little clip on the inlet needle hooked up wrong and it will stop fuel flow and cause the symptoms you are seeing. Pull the top and check it along with the float level.

Jeff

[too much stuff]

Check the gas cap?

[chipflyer]

Also take a look at the link below, its about the best info you will find online about quadrajets from probably the sharpest quadrajet guru there is.

http://www.digitalcorvettes.com/foru...ad.php?t=88376

Jeff

[kevmic28]

So out of curiosity what did you do to fix the original fuel issue, I think I may have that same problem.

[rogergodding]

Even more help, thanks!! Gas cap on or off no difference.... don't think the float needle is an issue but will check that too, I was looking at a similar page as the link above earlier..... I will fool with it more tomorrow or on the weekend or maybe just drop a new engine in it and be done.... JK.....

[rogergodding]

Originally Posted by kevmic28

So out of curiosity what did you do to fix the original fuel issue, I think I may have that same problem.

Sorry if I am jumping around with the symptoms, but I had the thing running and it would run as long as I wanted it to sitting in the driveway.... I replaced the fuel pump which did nothing as far as air in the line, then I replaced all of the rubber hoses involved in the fuel line and cleared the junk from the bottom of the sending unit line (inside the tank). The "sock" was completely wasted in the tank and the line was full of crap. I was sure it was fixed at this point!!

[hotrodhomi]

Did you replace the rubber lines the connect the tank to the rest of the fuel line? I had a bad fuel line on my blazer tank that took forever for me to find because it wasn't visible until the tank was lowered.

[rogergodding]

Originally Posted by hotrodhomi

Did you replace the rubber lines the connect the tank to the rest of the fuel line? I had a bad fuel line on my blazer tank that took forever for me to find because it wasn't visible until the tank was lowered.

yes I did

[Brainchild]

My 2.8 did the same thing in my s-10, I swore it was a fuel issue, to the point of changing fuel pump,carb,and still nothing. Finally I changed the ignition module and it ran like a champ.
The thing died and I put 2 gal of gas in, drove it to the gas station filled it up, and 2 blocks down the road it died, started it drove it 2 blocks at a time til I got home. I know it sounds strange but it's worth a try.

[rogergodding]

Originally Posted by Brainchild

My 2.8 did the same thing in my s-10, I swore it was a fuel issue, to the point of changing fuel pump,carb,and still nothing. Finally I changed the ignition module and it ran like a champ.
The thing died and I put 2 gal of gas in, drove it to the gas station filled it up, and 2 blocks down the road it died, started it drove it 2 blocks at a time til I got home. I know it sounds strange but it's worth a try.

Good call!! I've had a module go out before, symptoms were backfire and stuff... will keep that in mind.....

[Brainchild]

Originally Posted by rogergodding

Good call!! I've had a module go out before, symptoms were backfire and stuff... will keep that in mind.....

Yup me too,and I've had them just quit, this one was one strange bird, took me a week and 100 bucks to figure it out..lol

[Clutch442]

My truck did the exact same thing you are describing. Would idle for a week straight and not miss a beat. I could drive it around and everything would be fine until it got under a little bit of a load ( going up hill, hard acelleration) then it would die. My metal fuel lines from the tank to the fuel pump were stopped up with years of gunk. You couldn't hardly blow through them.

[jborders]

I had the same issue and it took me forever to find it. I had a clear fuel filter and it looked clean in the glass but when i finally removed it to check it on the inlet side it had several pieces to large to get in the filter stopping it up. I would say it was 85% blocked.

[mrein3]

I'll start with saying I've never seen this on an automobile carb.
However when dealing with small stuff I see it all the time.

The ethanol in the gas they sell now can separate leaving you with a tank full of water and gas. In the carb bowl the same thing can happen if it sits for a while with ethanol mixed gas. This water then makes a "rust gel" that clogs up the needle and seat. At idle, enough gas gets by and the engine keeps running. When you go to use it the demand for fuel goes up and the needle doesn't let enough fuel by and you run out.

If your state doesn't have ethanol mixed in with the gas or you don't let the truck sit, never mind.