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1984 GMC 5.0L G2500 Vandura stalls when warm or in drive.


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Keyes113
New User

Feb 15, 2017, 11:54 AM

Post #1 of 8 (289 views)
1984 GMC 5.0L G2500 Vandura stalls when warm or in drive. Sign In

I recently inherited a 1984 GMC G2500 5.0L Vandura conversion camper van. It sat in storage for close to 12 years unused. I cleaned the caburetor replaced the fuel filters and pumped out the old fuel. I installed a new mechanical fuel pump because the old one wasn't getting anything to the carburetor. There are no visible fuel leaks that I have found. I'm going to remove the fuel tank and clean it out next and after that I'll check the distributor assembly. It starts fine and will idle smooth until it gets warm and then it's almost as if it's not getting enough fuel. I tried an electric fuel pump and that didn't help either. I believe it was running too rich at that point. Any pointers would be much appreciated.


kev2
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Feb 15, 2017, 12:06 PM

Post #2 of 8 (284 views)
Re: 1984 GMC 5.0L G2500 Vandura stalls when warm or in drive. Sign In

   Is choke operating -
It should be closed then open @1/4" at idle then when hot choke would be full open. might want to check choke pull off ?


Hammer Time
Ultimate Carjunky / Moderator
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Feb 15, 2017, 12:13 PM

Post #3 of 8 (282 views)
Re: 1984 GMC 5.0L G2500 Vandura stalls when warm or in drive. Sign In


Quote
I cleaned the caburetor


How did you go about doing that?



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Keyes113
New User

Feb 15, 2017, 5:57 PM

Post #4 of 8 (262 views)
Re: 1984 GMC 5.0L G2500 Vandura stalls when warm or in drive. Sign In

I had the air cleaner off and observed the choke operating properly.


Keyes113
New User

Feb 15, 2017, 6:00 PM

Post #5 of 8 (260 views)
Re: 1984 GMC 5.0L G2500 Vandura stalls when warm or in drive. Sign In

I unbolted each section and used carburetor cleaner/ lubricant and removed all the build up inside. I replaced the gaskets and put it back together the way I found it.


Tom Greenleaf
Ultimate Carjunky / Moderator
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Feb 15, 2017, 10:29 PM

Post #6 of 8 (250 views)
Re: 1984 GMC 5.0L G2500 Vandura stalls when warm or in drive. Sign In

2 or 4 BBL carb? Barely matters the rubber of primary and or secondary pull off(s) are junk at the age and sitting. You have to test those with a vacuum pump available as a pistol with a gauge.


BTW - carb #s will help on the driver's side, middle of carb body where throttle pivots read bottom to top #s like 1701xyzz - all #s. Can get these parts still and new that will be much more ethanol friendly which already destroyed those parts. You use vacuum pump and drill bits to set those or check them as most folks would NOT buy the total carb adjusting set of tools.


Love/hate item for vehicles/engines. Perfect when right and impossible if you don't have a clue. Brand new most were not adjusted properly at all so you have to know,


T
(fixed missing word in text above)



(This post was edited by Tom Greenleaf on Feb 17, 2017, 12:40 AM)


Keyes113
New User

Feb 16, 2017, 7:20 PM

Post #7 of 8 (230 views)
Re: 1984 GMC 5.0L G2500 Vandura stalls when warm or in drive. Sign In

4BBL. Thank you this helps a lot.


Tom Greenleaf
Ultimate Carjunky / Moderator
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Feb 17, 2017, 12:59 AM

Post #8 of 8 (214 views)
Re: 1984 GMC 5.0L G2500 Vandura stalls when warm or in drive. Sign In

Missed a word in my last post and fixed that. Tools for this you should have is the open ended one inch wrench for the fuel filter housing and a flare nut wrench for the line to it. Other than that drill bits and the hand operated vacuum pump is handy for lots of things.


If you replace this I strongly suggest keeping the old one now if a core charge to swap it for another that may never be right or later need a part.


Fuel filter is tiny vs the amount of fuel that flow thru it. They are also easy to cross up threads and ruin whole carb so beware of EXACTLY how it works.


No joke friend - it ended about by 1984 but dealers when vehicles were sold new charged "Dealer Prep" to make the final adjustments all around vehicles and rarely did or even then didn't know how!
OE was a Rochester Quadrajet with specific settings for this van once right good for ages with just periodic cleaning and checks.


Know that by 1984 this carb and others were tamper proofing them so you couldn't change settings but can with special procedures. Great carbs just fussy once and those rubber pull off diaphragms fail about every 5-10 years so was and is a common thing to replace then adjust as they aren't when NEW!


This just the carb. Van sat so there will be other things all thru it to deal with as well but should be a "can do" thing if you are up to it,


Tom







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