engine question

Mr.Smooth · 03-12-2007, 02:21 PM

i have a 68 442. 400 sb. when the car sits for about a week or so, it wont start. it cranks and cranks, just doesnt start. i wind up having to pour some gas in the carb. then it fires up.

anyone know why it does that? or does anyone have suggestions on what i can do??

thanks
Mike

Oldsmaniac · 03-12-2007, 02:58 PM

A 68 442 would have a 400 big block engine in it from the factory.....I suspect the quadrajet carb is leaking fuel down thru the casting plugs when it sits. When you try and start after a week the carb is dry and must be refilled by the fuel pump. This is why the starter must crank so much...I dont know a fix without replacing the carb or carb body. Your car should start after a lot of cranking.....if it doesnt maybe there is some float trouble or a restricted fuel filter or weak fuel pump.

Eightupman · 03-12-2007, 03:40 PM

One fix, but expensive, is to change to an electric pump with a switch on the dash. My dads 400 in his 66 442 will not start after sitting either. 10 seconds with the pump on, it fires right up. The fuel pump on the motor MAY be suspect if it is old and not strong enough to fill the bowl during cranking, but sustains flow when running.

There may be some debris holding the needle open enought to allow the fuel to seep out of the carb bowl too.

Hope that helps.

John

soocutlass · 03-12-2007, 07:27 PM

The carb fuel bowl should never empty unless sitting for long periods of time or in dry climate. If the choke and accelator pump are not functioning properly this could be an issue. The first thing you should check is if every time you press the gas does it squirt gas in the carb and secondly is the choke fully closed on start up. Chances are it is not a fuel pump because it starts after putting gas in the carb, if it was a fuel pump it would only use the gas you poured down the carb and stall or if was weak it would die out under heavy accelleration.

Mr.Smooth · 03-12-2007, 07:36 PM

Quote:

Originally Posted by soocutlass

The carb fuel bowl should never empty unless sitting for long periods of time or in dry climate. If the choke and accelator pump are not functioning properly this could be an issue. The first thing you should check is if every time you press the gas does it squirt gas in the carb and secondly is the choke fully closed on start up. Chances are it is not a fuel pump because it starts after putting gas in the carb, if it was a fuel pump it would only use the gas you poured down the carb and stall or if was weak it would die out under heavy accelleration.

do you think having the carb rebuilt would help/fix the problems? does anyone know what it would cost to have one rebuilt?

soocutlass · 03-12-2007, 08:06 PM

If you are uncertain about carburators and it has not been rebuilt before then it should be rebuilt which is cheaper than replacing it. You can by kits at any parts dealer but it should be done by someone who is a professional..

Mr.Smooth · 03-12-2007, 08:28 PM

Quote:

Originally Posted by soocutlass

You can by kits at any parts dealer but it should be done by someone who is a professional..

oh definately. maybe ill try that in the coming weeks

keith6989 · 03-13-2007, 04:25 AM

I rebuilt mine, but it is still hell to start after awhile, don't get your hopes up, but it is worth a try, let us know how it fairs out for you.

03-12-2007, 02:21 PM	#1 (permalink)
Mr.Smooth Junior Member Join Date: Mar 2007 Posts: 11	engine question i have a 68 442. 400 sb. when the car sits for about a week or so, it wont start. it cranks and cranks, just doesnt start. i wind up having to pour some gas in the carb. then it fires up. anyone know why it does that? or does anyone have suggestions on what i can do?? thanks Mike

03-13-2007, 04:25 AM	#8 (permalink)
keith6989 2Blue 55" Join Date: Dec 2006 Location: Nova Scotia, Canada Posts: 380	I rebuilt mine, but it is still hell to start after awhile, don't get your hopes up, but it is worth a try, let us know how it fairs out for you. __________________ Robert 1955 Oldsmobile Super 88

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03-12-2007, 02:58 PM	#2 (permalink)
Oldsmaniac Senior Member Join Date: Oct 2005 Location: NJ Posts: 405	A 68 442 would have a 400 big block engine in it from the factory.....I suspect the quadrajet carb is leaking fuel down thru the casting plugs when it sits. When you try and start after a week the carb is dry and must be refilled by the fuel pump. This is why the starter must crank so much...I dont know a fix without replacing the carb or carb body. Your car should start after a lot of cranking.....if it doesnt maybe there is some float trouble or a restricted fuel filter or weak fuel pump.

03-12-2007, 03:40 PM	#3 (permalink)
Eightupman Senior Member Join Date: Nov 2006 Location: Fayetteville, NC Posts: 252	One fix, but expensive, is to change to an electric pump with a switch on the dash. My dads 400 in his 66 442 will not start after sitting either. 10 seconds with the pump on, it fires right up. The fuel pump on the motor MAY be suspect if it is old and not strong enough to fill the bowl during cranking, but sustains flow when running. There may be some debris holding the needle open enought to allow the fuel to seep out of the carb bowl too. Hope that helps. John

03-12-2007, 07:27 PM	#4 (permalink)
soocutlass Junior Member Join Date: Mar 2007 Posts: 15	The carb fuel bowl should never empty unless sitting for long periods of time or in dry climate. If the choke and accelator pump are not functioning properly this could be an issue. The first thing you should check is if every time you press the gas does it squirt gas in the carb and secondly is the choke fully closed on start up. Chances are it is not a fuel pump because it starts after putting gas in the carb, if it was a fuel pump it would only use the gas you poured down the carb and stall or if was weak it would die out under heavy accelleration.

03-12-2007, 08:06 PM	#6 (permalink)
soocutlass Junior Member Join Date: Mar 2007 Posts: 15	If you are uncertain about carburators and it has not been rebuilt before then it should be rebuilt which is cheaper than replacing it. You can by kits at any parts dealer but it should be done by someone who is a professional..