1972 chev pick up starting problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jordanknight · 12-07-2014, 09:52 AM

Hey guys new to this site so hopefully I'm gonna by about this the right way. I just picked up a 72 Chevy 4x4. I put a new fuel pump and fuel lines on it cause the pump was gone. The truck runs great but only if I dump gas down the carb to get it going. After i prime it the truck runs great and I can shut it down and fire it up a half hour later but if I wait a couple hours it has to be primed again. It's a 350 with a Qjet carb. The truck has also been sitting for ten years. Should I pull the carb and rebuild or just take it apart and clean it ? Still new to the world of wrenching so not to sure we're to start. Thanks in advance

geezer#99 · 12-07-2014, 11:15 AM

Welcome to the money pit!!
Take some pics of your carb so we can see what you got.
Do you have a working choke?
Is your accelerator pump working?

**landy** · 12-07-2014, 11:45 AM

As gezzer said, check accelerator pump with engine off, of course. After engine has run, turn it off, look down barrel and move throttle linkage. Should see fuel squirting from side into throat.

If truck has been sitting 10 years, carb probably would benefit from cleaning and rebuild.

Jordanknight · 12-07-2014, 12:31 PM

Where is the accelerator pump? And I don't see any fluild squirting into the carb when I work the throttle at the carb.

Jordanknight · 12-07-2014, 12:33 PM

Wouldn't let me post more than one pic at a time

geezer#99 · 12-07-2014, 12:40 PM

Quote:

Originally Posted by Jordanknight

Wouldn't let me post more than one pic at a time

The accelerator pump is that lever on the top right side of your carb. Pushes down on a plunger.
Can you give us a closer shot of your second pic?

geezer#99 · 12-07-2014, 01:42 PM

Carb rebuild or replacement time.
What's your budget like?
Done a carb before?

Jordanknight · 12-07-2014, 02:02 PM

Money isn't a problem it's lack of knowledge. I thought about tossing the Qjet and buying another carb but I was told I'd get better gas mileage with the Qjet

Jordanknight · 12-07-2014, 02:03 PM

And no I havnt rebuilt a carb the size before only on two strokes and small motors.

geezer#99 · 12-07-2014, 02:39 PM

You can buy rebuilt carbs from several sources.
Here's a good one.
https://www.smicarburetor.com/
Or keep it in the same country and contact this guy in Vancouver area.
http://www.thecarburetorguy.com/

I've had quadrajets from both of them.

If you want to tackle a rebuild then let us know. I've got links out the wahzoo For that! LOL!!

12-07-2014, 09:52 AM	#1
Jordanknight Registered User Join Date: Dec 2014 Location: Orillia ontario Posts: 7	1972 chev pick up starting problem Hey guys new to this site so hopefully I'm gonna by about this the right way. I just picked up a 72 Chevy 4x4. I put a new fuel pump and fuel lines on it cause the pump was gone. The truck runs great but only if I dump gas down the carb to get it going. After i prime it the truck runs great and I can shut it down and fire it up a half hour later but if I wait a couple hours it has to be primed again. It's a 350 with a Qjet carb. The truck has also been sitting for ten years. Should I pull the carb and rebuild or just take it apart and clean it ? Still new to the world of wrenching so not to sure we're to start. Thanks in advance

12-07-2014, 11:15 AM	#2
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,701	Re: 1972 chev pick up starting problem Welcome to the money pit!! Take some pics of your carb so we can see what you got. Do you have a working choke? Is your accelerator pump working?

12-07-2014, 11:45 AM	#3
landy Senior Member Join Date: Jun 2000 Location: alb, nm Posts: 413	Re: 1972 chev pick up starting problem As gezzer said, check accelerator pump with engine off, of course. After engine has run, turn it off, look down barrel and move throttle linkage. Should see fuel squirting from side into throat. If truck has been sitting 10 years, carb probably would benefit from cleaning and rebuild.

12-07-2014, 12:31 PM	#4
Jordanknight Registered User Join Date: Dec 2014 Location: Orillia ontario Posts: 7	Re: 1972 chev pick up starting problem Where is the accelerator pump? And I don't see any fluild squirting into the carb when I work the throttle at the carb. Attached Images

12-07-2014, 12:33 PM	#5
Jordanknight Registered User Join Date: Dec 2014 Location: Orillia ontario Posts: 7	Re: 1972 chev pick up starting problem Wouldn't let me post more than one pic at a time Attached Images

12-07-2014, 01:42 PM	#7
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,701	Re: 1972 chev pick up starting problem Carb rebuild or replacement time. What's your budget like? Done a carb before?

12-07-2014, 02:02 PM	#8
Jordanknight Registered User Join Date: Dec 2014 Location: Orillia ontario Posts: 7	Re: 1972 chev pick up starting problem Money isn't a problem it's lack of knowledge. I thought about tossing the Qjet and buying another carb but I was told I'd get better gas mileage with the Qjet

12-07-2014, 02:03 PM	#9
Jordanknight Registered User Join Date: Dec 2014 Location: Orillia ontario Posts: 7	Re: 1972 chev pick up starting problem And no I havnt rebuilt a carb the size before only on two strokes and small motors.

12-07-2014, 02:39 PM	#10
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,701	Re: 1972 chev pick up starting problem You can buy rebuilt carbs from several sources. Here's a good one. https://www.smicarburetor.com/ Or keep it in the same country and contact this guy in Vancouver area. http://www.thecarburetorguy.com/ I've had quadrajets from both of them. If you want to tackle a rebuild then let us know. I've got links out the wahzoo For that! LOL!!



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