Carb / Starting problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

parrisc19844x4_468 · 04-02-2015, 02:43 PM

OK, put my 1983 4x4 swb silverado(350 , 700R4) away last fall, got it out. (checked the oil, tires, water level, tranny fluid, etc.) yesterday for the first time this year. Put in the fully charged battery set the choke and no start. Pumped it a few times then no start. Took the cleaner off and gave it a shot of gas directly into the 4 barrel Quadrajet. This time it fires right up and runs fine. So far its good. I drove it for about 5 miles and decided to stop and put in some fresh gas. I was on the tank that was about 1/4, filled it up , this time it started right up. Drove about 1 miles, then it kills. As I was coasting I tried to refire it, it fired a few times but would not start. I had to get out and give it another shot of gas direclty down the hold again, it starts right up and away I went. I drove for about 50 mils and no problems. I shot it off once I got back and again it would not start until I gave it another shot.

Any ideas? I want to keep it original so not going to replace the Quadrajet, not an option. Maybe it needs to be rebuilt? Seems the fuel pump is ok? Not sure at this point.

Thanks in Advance for your ideas

69heavychevy · 04-02-2015, 04:41 PM

Seems like your carb might need a rebuild like you said. I had to rebuild my edelbrock twice within six months for letting it sit too long. The ethanol turns into a jello like substance after sitting a while and just causes all kinds of issues with fuel systems.

Bigstevex4 · 04-02-2015, 05:18 PM

The first time i woild have said most gas evaperated. put a can seafom in it run it see what happens.

Hiluxxulih · 04-02-2015, 05:21 PM

Sounds like an accelerator pump problem .

tucsonjwt · 04-02-2015, 07:59 PM

I would check the obvious first - remove air cleaner lid - is the choke valve stuck all the way shut?

parrisc19844x4_468 · 04-03-2015, 02:52 PM

Quote:

Originally Posted by tucsonjwt

I would check the obvious first - remove air cleaner lid - is the choke valve stuck all the way shut?

Hey thanks for that tip. I looked at my choke and the wire had came lose. Not sure if that was it or not. I will test it when it warms backup here again. only 47 today.

04-02-2015, 02:43 PM	#1
parrisc19844x4_468 Registered User Join Date: Oct 2010 Location: Town of Summit, WI Posts: 322	Carb / Starting problems OK, put my 1983 4x4 swb silverado(350 , 700R4) away last fall, got it out. (checked the oil, tires, water level, tranny fluid, etc.) yesterday for the first time this year. Put in the fully charged battery set the choke and no start. Pumped it a few times then no start. Took the cleaner off and gave it a shot of gas directly into the 4 barrel Quadrajet. This time it fires right up and runs fine. So far its good. I drove it for about 5 miles and decided to stop and put in some fresh gas. I was on the tank that was about 1/4, filled it up , this time it started right up. Drove about 1 miles, then it kills. As I was coasting I tried to refire it, it fired a few times but would not start. I had to get out and give it another shot of gas direclty down the hold again, it starts right up and away I went. I drove for about 50 mils and no problems. I shot it off once I got back and again it would not start until I gave it another shot. Any ideas? I want to keep it original so not going to replace the Quadrajet, not an option. Maybe it needs to be rebuilt? Seems the fuel pump is ok? Not sure at this point. Thanks in Advance for your ideas __________________ 2017 Silverado LTZ 6.2 1984 Scottsdale K10 - 468 700r 4x4 lwb 1978 GMC Sierra Grande K15 350 Soond to be 406 th350 4x4 swb 1968 GMC 20 305 V6 good ole wood hauler. Good Fences make good neighbors

04-02-2015, 04:41 PM	#2
69heavychevy Registered User Join Date: Jan 2007 Location: Garland,TX Posts: 431	Re: Carb / Starting problems Seems like your carb might need a rebuild like you said. I had to rebuild my edelbrock twice within six months for letting it sit too long. The ethanol turns into a jello like substance after sitting a while and just causes all kinds of issues with fuel systems. __________________ 80 C10 SWB Step Side - 350 w/ vortec heads, TH350, 12-bolt 3.73

04-02-2015, 05:18 PM	#3
Bigstevex4 Registered User Join Date: Oct 2014 Location: Spearfish South Dakota Posts: 407	Re: Carb / Starting problems The first time i woild have said most gas evaperated. put a can seafom in it run it see what happens. __________________ 83 c10 long Box Daily Driver 90 Jimmy parked 98 Road King/ 06 Road Glide In memorium 63 impala SS/ 65 Chevy Panel 65 GMC Short Box/ 68 Camero

04-02-2015, 05:21 PM	#4
Hiluxxulih Registered User Join Date: Mar 2011 Location: Coos Bay , Oregon Posts: 272	Re: Carb / Starting problems Sounds like an accelerator pump problem . __________________ 1985 Chevrolet Custom Deluxe 4x2 , 305 v8 , 700R4 transmission

04-02-2015, 07:59 PM	#5
tucsonjwt Registered User Join Date: Jul 2007 Location: Tucson, AZ Posts: 3,189	Re: Carb / Starting problems I would check the obvious first - remove air cleaner lid - is the choke valve stuck all the way shut?

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