Quadrajet Help! - Page 3 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cowboy5683 · 10-12-2009, 02:53 AM

Sounds to me like you have a fuel delivery problem..crank it without the line attached and see if it is pumping at all..if not pump could be bad ..have you replaced pump lately?..if so did you make sure the fuel pump rod was set up with the pump properly?..easy to do...before pump install coat the one end of rod with white lithium grease and that will help hold the rod in while you install pump..make sure all lines are connected properly from gas tank up and no leaks..I have accidentally hooked up return and fuel line backwards before..lol..I do believe you have a delivery problem and it's prolly the pump.

GMC Guy · 10-12-2009, 03:34 AM

well the other day i disconnected the fuel line and stuck it into a water bottle. while cranking it, the bottle filled rather quickly. but no i haven't replaced the pump lately, but i figured if it was running ok before the carb rebuild, then that would rule out the pump

cowboy5683 · 10-12-2009, 03:46 AM

I would strongly recommend you check it again..In my experience fuel pumps go out quickly..One second yer running..next yer dead..diaphragm internally could have broken and kaput..Everything yer doin at this point is diagnostic to rule out everything.

GMC Guy · 10-12-2009, 03:52 AM

alright thanks, i'll check again tomorrow

Rogue_Sentinel · 10-14-2009, 03:52 PM

check this out , it may help

http://www.vetteprojects.com/kstyer/quadrajet.htm

GMC Guy · 10-14-2009, 04:50 PM

Quote:

Originally Posted by Rogue_Sentinel

check this out , it may help

http://www.vetteprojects.com/kstyer/quadrajet.htm

i literally did everything that guy said to do, still no success.
oh well, i picked up a 1973 q-jet from a friend. i removed all my emissions stuff, plugged holes etc. then rebuilt the 73 carb even better than my stock one, but i'm having to do a few modifications to get the accelerator cable and return springs to fit right. also trying to figure out this different style choke. my original carb had lines running into the manifold as a heating element for the choke. but this 73 carb is set-up totally different. can anyone shed some light on how i can make this work?

cowboy5683 · 10-14-2009, 05:35 PM

why not take the choke off of yer 79 carb and install it on the 73?..should allow you to hook it up to yer original line..By the way how is the rest going?

cowboy5683 · 10-14-2009, 05:41 PM

Try this link out also..might help ya
http://www.oldcarmanualproject.com/m...73_4M_0001.htm

GMC Guy · 10-14-2009, 06:57 PM

here's the 79 carb

and here's the 73 carb

79gmcc15 · 10-14-2009, 07:41 PM

I have that kind of carb, I think. if the choke is like this one

Then what I did is hook up a universal manual choke.

Oh, yeah, I have that port blocked off now.

cowboy5683 · 10-14-2009, 07:50 PM

Hey 79..Looks like you have a manual choke set up there..Am I right?..If so let GMCguy know how ya hooked that up..He may need that info.

79gmcc15 · 10-14-2009, 08:06 PM

Quote:

Originally Posted by cowboy5683

Hey 79..Looks like you have a manual choke set up there..Am I right?..If so let GMCguy know how ya hooked that up..He may need that info.

ya, its a universal one from help section in the auto store.

its fairly easy, but a couple things I learned is that you have to drill out the hole slightly more then what it is now. IDK if you can see in the last pic but all I used is the pin and set screw on the carb and then have the line held by the bracket set up like a clamp. I will help you more if you need it. and will also take more pics if you need it. total cost for me to do it was about 15 bucks and 3 hours+ but thats only cause I had a hard time figuring how it all worked. anyway, let me know if thats what you want to do and I will help you more!

joe231 · 12-18-2009, 11:57 PM

So what happened with this carb?

GMC Guy · 12-19-2009, 04:40 AM

the carb runs great, but i still need to get a manual choke kit for it and hook it up.

79gmcc15 · 12-19-2009, 04:51 AM

if you have any questions about how to do it let me know!
It can be done to look better. mine is not a shining example of making it look nice. I was just trying to get it to work lol.

87Bob · 12-19-2009, 06:35 AM

Quote:

Originally Posted by cowboy5683

I have already rebuilt it once as a novice..I am currently awaiting a accelerator pump and other goodies from Cliff's high performance so I can put it back together..the top airhorn has a slight warp to it which I am gonna fix tonight with a vise..and I have slightly drilled out the air/fuel orifices to help with the tuning at idle..I love Quads..They are a lil bit intimidating at first..but once you tear em apart a few times and do ALOT of research..They become quite easy to tear apart and tune.

I just had Cliff rebuild mine cost me 225.00 with shipping but it was worth every penny! my 305 runs like a scalded dog!! Other than tuning I wil never touch the insides of my85 Q-Jet I'll send it to Cliff.

joe231 · 12-19-2009, 11:04 AM

Quote:

Originally Posted by GMC Guy

the carb runs great, but i still need to get a manual choke kit for it and hook it up.

Did you ever figure out the fuel blockage problem on the other carb?

GMC Guy · 12-19-2009, 08:18 PM

i did, apparently the float level was messed up. so when it was dry in the bowl the needle wasn't lifting up allowing fuel to come in. i thought i adjusted the float level exactly how the directions said to...but oh well, it's all a learning experience

joe231 · 12-19-2009, 09:49 PM

Cool!
Thanks for the info!

10-12-2009, 02:53 AM	#51
cowboy5683 Registered User Join Date: Jun 2009 Location: San Bernardino CA Posts: 94	Re: Quadrajet Help! Sounds to me like you have a fuel delivery problem..crank it without the line attached and see if it is pumping at all..if not pump could be bad ..have you replaced pump lately?..if so did you make sure the fuel pump rod was set up with the pump properly?..easy to do...before pump install coat the one end of rod with white lithium grease and that will help hold the rod in while you install pump..make sure all lines are connected properly from gas tank up and no leaks..I have accidentally hooked up return and fuel line backwards before..lol..I do believe you have a delivery problem and it's prolly the pump. Last edited by cowboy5683; 10-12-2009 at 03:11 AM.

10-12-2009, 03:34 AM	#52
GMC Guy Registered User Join Date: May 2009 Location: Sparks, NV Posts: 913	Re: Quadrajet Help! well the other day i disconnected the fuel line and stuck it into a water bottle. while cranking it, the bottle filled rather quickly. but no i haven't replaced the pump lately, but i figured if it was running ok before the carb rebuild, then that would rule out the pump __________________ Greg 1974 GMC 1/2 Ton SWB Fleetside L33 5.3/4l65e .................__ ............._____l __\__ ..............l_(O)_ l___(O)]

10-12-2009, 03:46 AM	#53
cowboy5683 Registered User Join Date: Jun 2009 Location: San Bernardino CA Posts: 94	Re: Quadrajet Help! I would strongly recommend you check it again..In my experience fuel pumps go out quickly..One second yer running..next yer dead..diaphragm internally could have broken and kaput..Everything yer doin at this point is diagnostic to rule out everything.

10-12-2009, 03:52 AM	#54
GMC Guy Registered User Join Date: May 2009 Location: Sparks, NV Posts: 913	Re: Quadrajet Help! alright thanks, i'll check again tomorrow __________________ Greg 1974 GMC 1/2 Ton SWB Fleetside L33 5.3/4l65e .................__ ............._____l __\__ ..............l_(O)_ l___(O)]

10-14-2009, 03:52 PM	#55
Rogue_Sentinel Registered User Join Date: Mar 2009 Location: nc, mount airy Posts: 376	Re: Quadrajet Help! check this out , it may help http://www.vetteprojects.com/kstyer/quadrajet.htm __________________ "Myths and legends die hard in America. We love them for the extra dimension they provide, the illusion of near-infinite possibility to erase the narrow confines of most men's reality. Weird heroes and mould-breaking champions exist as living proof to those who need it that the tyranny of 'the rat race' is not yet final." Hunter S THompson

10-14-2009, 05:35 PM	#57
cowboy5683 Registered User Join Date: Jun 2009 Location: San Bernardino CA Posts: 94	Re: Quadrajet Help! why not take the choke off of yer 79 carb and install it on the 73?..should allow you to hook it up to yer original line..By the way how is the rest going?

10-14-2009, 05:41 PM	#58
cowboy5683 Registered User Join Date: Jun 2009 Location: San Bernardino CA Posts: 94	Re: Quadrajet Help! Try this link out also..might help ya http://www.oldcarmanualproject.com/m...73_4M_0001.htm

10-14-2009, 06:57 PM	#59
GMC Guy Registered User Join Date: May 2009 Location: Sparks, NV Posts: 913	Re: Quadrajet Help! here's the 79 carb and here's the 73 carb __________________ Greg 1974 GMC 1/2 Ton SWB Fleetside L33 5.3/4l65e .................__ ............._____l __\__ ..............l_(O)_ l___(O)]

10-14-2009, 07:41 PM	#60
79gmcc15 Gettin It One Pice At A Time Join Date: Oct 2004 Location: everett, washington Posts: 2,688	Re: Quadrajet Help! I have that kind of carb, I think. if the choke is like this one Then what I did is hook up a universal manual choke. Oh, yeah, I have that port blocked off now. __________________ RIP ELJAY Work In Progress 1979 GMC C1500 Trailering Special. Getting the truck done, one piece at a time. “You can tell a lot about a fellow’s character by his way of eating jellybeans.”Ronald Reagan “I don’t know the key to success but I know the key to failure is trying to please everybody.” Bill Cosby Last edited by 79gmcc15; 10-14-2009 at 07:44 PM.

10-14-2009, 07:50 PM	#61
cowboy5683 Registered User Join Date: Jun 2009 Location: San Bernardino CA Posts: 94	Re: Quadrajet Help! Hey 79..Looks like you have a manual choke set up there..Am I right?..If so let GMCguy know how ya hooked that up..He may need that info.

12-18-2009, 11:57 PM	#63
joe231 Registered User Join Date: Dec 2007 Location: Palmer, Alaska Posts: 13,821	Re: Quadrajet Help! So what happened with this carb? __________________ *CHEVY ONLY*

12-19-2009, 04:40 AM	#64
GMC Guy Registered User Join Date: May 2009 Location: Sparks, NV Posts: 913	Re: Quadrajet Help! the carb runs great, but i still need to get a manual choke kit for it and hook it up. __________________ Greg 1974 GMC 1/2 Ton SWB Fleetside L33 5.3/4l65e .................__ ............._____l __\__ ..............l_(O)_ l___(O)]

12-19-2009, 04:51 AM	#65
79gmcc15 Gettin It One Pice At A Time Join Date: Oct 2004 Location: everett, washington Posts: 2,688	Re: Quadrajet Help! if you have any questions about how to do it let me know! It can be done to look better. mine is not a shining example of making it look nice. I was just trying to get it to work lol. __________________ RIP ELJAY Work In Progress 1979 GMC C1500 Trailering Special. Getting the truck done, one piece at a time. “You can tell a lot about a fellow’s character by his way of eating jellybeans.”Ronald Reagan “I don’t know the key to success but I know the key to failure is trying to please everybody.” Bill Cosby Last edited by 79gmcc15; 12-19-2009 at 05:51 AM.

12-19-2009, 08:18 PM	#68
GMC Guy Registered User Join Date: May 2009 Location: Sparks, NV Posts: 913	Re: Quadrajet Help! i did, apparently the float level was messed up. so when it was dry in the bowl the needle wasn't lifting up allowing fuel to come in. i thought i adjusted the float level exactly how the directions said to...but oh well, it's all a learning experience __________________ Greg 1974 GMC 1/2 Ton SWB Fleetside L33 5.3/4l65e .................__ ............._____l __\__ ..............l_(O)_ l___(O)]

12-19-2009, 09:49 PM	#69
joe231 Registered User Join Date: Dec 2007 Location: Palmer, Alaska Posts: 13,821	Re: Quadrajet Help! Cool! Thanks for the info! __________________ *CHEVY ONLY*



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