[unclex19]

here is the situation I have a 67 chevy truck that has sat for 2 years we have replaced the carb, cap, rotor, air filter, plugs & wires,changed the fluids, and all filters replaced. There was about a gallon of old gas in the tank we added new fuel along with stabalizer changed the fuel filter and fired it up after adjusting the carb she now runs! although the problem is she is missing She will sit there great on a idle but when you give her any gas she falls right on her face. I have checked and there is plenty of fuel to the carb. Idle adjustment is at 2 turns out to start to keep her running they are at 4 turns out ( quadrajet) What am I missing? this is my first project so please bear with me Amy

[Choctaw Bob]

Acellerator pump needs replaced. The rubber seal around the plunger is cracked or the check valve is gumed up. You probably need to rebuild the carb because all the fuel in it evaporated and left a gummy mess that passages clogged.

[unclex19]

Sir, this is a brand new carb Q-jet 4bbl getting LOTS of fuel but wont stay running what has me also puzzled is there is not any black smoke coming out the pipes

[Choctaw Bob]

Originally Posted by unclex19

Sir, this is a brand new carb Q-jet 4bbl getting LOTS of fuel but wont stay running what has me also puzzled is there is not any black smoke coming out the pipes

There is probably trash in the fuel system somewhere. Check the fuel filter and see if it has already filled with trash. There is a filter at the carb inlet also if it is like most.

Sometimes the fuel system will flow enough fuel to start the engine but not enough to keep it running.

Also the mechanical fuel pump could be weak. Check for any leak around the vent hole. This would signify a broken diaphram.

I really think that is where you will find your problem.

[steve t]

you might have crossed up a plug wire, recheck wires,

[matt167]

Originally Posted by Choctaw Bob

There is probably trash in the fuel system somewhere. Check the fuel filter and see if it has already filled with trash. There is a filter at the carb inlet also if it is like most.

Sometimes the fuel system will flow enough fuel to start the engine but not enough to keep it running.

Also the mechanical fuel pump could be weak. Check for any leak around the vent hole. This would signify a broken diaphram.

I really think that is where you will find your problem.

my '51 Chevy ( '51 235 I6 ) will run great all day at idle, and great going down the road, then it like runs out of fuel, and spits, sputters and dies, starts up in idle but spits and sputters unless you let it sit a minuite. it is ither a clogged screen in the tank or a clogged line.

[unclex19]

going to check now on the fuel pump ( filters all got changed ) TY soo much wish me luck

[Choctaw Bob]

Originally Posted by unclex19

going to check now on the fuel pump ( filters all got changed ) TY soo much wish me luck

Real trashy fuel in a tank or line will fill the filters up in just a minute or two.

[Brian_B]

I have nothing to add to this thread that has not already been said. I saw the location listed as Ozarks. Technically, I live in the Ozarks as well. Just down in Arkansas.

I just wanted to say Hi to a neighbor.

[66GMC]

Does it behave this way just when the engine is cold or all the time?
What is the ambient temperature in "the ozarks" these days?

I'm thinking that you may be dealing with an automatic choke that is set too lean ... especially since it's a new carb.

And I totally agree with Choctaw Bob on the fuel trash comments.
Do a fuel delivery test ... take the hose off at the carb and extend it with anoher piece of fuel line. Crank the engine and see how long it takes to fill a moonshine botle

Sorry ... "Ozarks" ... couldn't resist.

[Choctaw Bob]

Originally Posted by 66GMC

Does it behave this way just when the engine is cold or all the time?
What is the ambient temperature in "the ozarks" these days?

I'm thinking that you may be dealing with an automatic choke that is set too lean ... especially since it's a new carb.

And I totally agree with Choctaw Bob on the fuel trash comments.
Do a fuel delivery test ... take the hose off at the carb and extend it with anoher piece of fuel line. Crank the engine and see how long it takes to fill a moonshine botle

Sorry ... "Ozarks" ... couldn't resist.

LOL! If you test the fuel like that, be sure you do it outside so the resulting fire won't burn your house down!

[DHMag]

is the carb the correct application for the engine ? could be wrong jetting, or the APT valve is not properly adjusted.

[65Stanger]

My car starts fine, but it won't idle right unless you give it a little gas. sometimes it takes a half second before I hit the gas before it actually sounds like it's revving. I am thinkin' carb problems. I just rebuild it, but I might have message something up. Maybe a whole new carb, since mine is really old =) If it was the original fomoco carb, then I'd probably stick with it and replace it, but it's not, so that's what's goin' on.

Oh, I forgot to tell you what to do to help yourself out. The spring is different sizes on the two different ends. The big side has to go to the top of the carb, and the little side towards the plunger, so that the arm will operate, and not just be slowly rising by letting the carb linkage push it.

[bigwildgrin]

okay Amy, if your truck has HEI I'm going to throw this out there since everyone has been suggesting fuel problems... I have a '61 chevy pickup that sat for, well two years, anyways it did the same thing. I too concentrated on the fuel; new carb, filters, fuel line, flushed the tank, then went on to new plug wires, cap and rotor. What I finally found (months later) was the little 'banana clip' (this is what I call it; it probably has a name but it is a little banana shaped plastic part with wires plugged into both ends) that sits under the rotor was bad. Now my little truck runs like a top. I don't think these clips go bad from sitting, but I've had a few go out in my time and they always seem to be the last thing I check. Sometimes they can shut an engine down completely, but sometimes they keep it running but doing weird things. Might be worth a check.

[BBCMudbogger]

That is the HEI ignition module. They can test that and the pickup at advance auto.